Simona Morariu

Petru Poni Institute of Macromolecular Chemistry

In this present study, we developed and characterized a series of supramolecular G4 hydrogels by integrating β-cyclodextrin (β-CD) and boronic acid linkers into a supramolecular matrix to enhance antibacterial activity against Staphylococcus aureus (S. aureus). We systematically investigated how varying the number of free boronic acid moieties (ran...

Laponite® (LAP) is an intensively studied synthetic clay due to the versatility given by its layered structure, which makes it usable in various applications. This review describes the multifaceted properties and applications of LAP in aqueous dispersions and gel systems. The first sections of the review discuss the LAP structure and the interactio...

Microbial infections represent a significant health risk, often leading to severe complications and, in some cases, even fatalities. As a result, there is an urgent need to explore innovative drug delivery systems and alternative therapeutic techniques. The photothermal therapy has emerged as a promising antibacterial approach and is the focus of t...

Microbial infections are a serious healthcare related problem, causing several complications and even death. That is why, the development of new drug delivery systems with prolonged effect represents an interesting research topic. This study presents the synthesis and characterization of new hydrogels based on chitosan and three halogenated monoald...

Hybrid dextran-G-quartet produces tunable biocompatible three-dimensional thixotropic hydrogels, able to support cell growth.

In the context of increasing interest in biomaterials with applicability in cosmetics and medicine, this research aims to obtain and characterize some hybrid materials based on chitosan (CS) (antibacterial, biocompatible, and biodegradable), poly(ethylene glycol) (PEG) (non-toxic and prevents the adsorption of protein and cell) and Laponite® RD (La...

Diabetes, characterized by an uncontrolled blood glucose level, is the main cause of blindness, heart attack, stroke, and lower limb amputation. Glucose-sensitive hydrogels able to release hypoglycemic drugs (such as insulin) as a response to the increase of the glucose level are of interest for researchers, considering the large number of diabetes...

The impetus for research into hydrogels based on selectively oxidized polysaccharides has been stimulated by the diversity of potential biomedical applications. Towards the development of a hemostatic wound dressing in this study, we creatively combined the (hemi)acetal and Schiff base bonds to prepare a series of multifunctional cryogels based on...

The present paper focuses on the rheological behaviour of a series of hydrogels prepared from chitosan and salicylaldehyde. The unusual crosslinking of chitosan with this monoaldehyde was assessed by 1H NMR spectroscopy, which demonstrated the formation of covalent imine bonds. The hydrogels exhibited a super-porous morphology, evidenced by SEM mea...

The paper aims at the preparation of chitosan self-healing hydrogels, designed as carriers for local drug delivery by parenteral administration. To this aim, 30 hydrogels were prepared using chitosan and pyridoxal 5-phosphate (P5P), the active form of vitamin B6 as precursors, by varying the ratio of glucosamine units and aldehyde on the one hand a...

Tremendous efforts are being made around the world to develop efficient ways to prevent/treat the novel β-coronavirus disease (COVID-19) caused by SARS-CoV-2. There are currently many studies and clinical trials (either based on computational predictions or clinical experiences), in progress, focusing on finding relevant protein targets and medicat...

The rheological properties of poly(ethylene glycol)(PEG)/Laponite® RD (Lap) and poly(propylene glycol)(PPG)/Lap aqueous dispersions, with 2% polymer and different clay concentrations, were investigated at 25 °C in order to establish the optimal composition to formulate a system applicable as drilling fluid. Some of the most important parameters in...

Physical hydrogels were obtained by successive freezing/thawing of poly(vinyl alcohol) (PVA) / hydroxypropylcellulose (HPC) solutions, adding different amounts of bovine serum albumin (BSA), in presence of reduced glutathione. The morphological and structural characteristics of networks as well as their viscoelastic properties were investigated by...

The paper reports hydrogels prepared from chitooligosaccharides with different polymerization degrees (14 to 51), by crosslinking with 2-formylphenylboronicacid in three molar ratios of their functionalities. The structural, morphological and supramolecular characterization confirmed a hydrogelation mechanism based on self-assembling of newly forme...

Facile method for the preparation of β–cyclodextrin–functionalized hydrogels based on guanosine quartet assembly was described. A series of seven hydrogels were prepared by linking β–cyclodextrin molecules with guanosine moieties in different ratios through benzene–1,4–diboronic acid linker in the presence of potassium hydroxide. The potassium ions...

The effect of ethanol (EtOH) addition on the behaviour of xanthan gum (XG) chains in water (W) was investigated at 25 °C by using turbidimetry, zeta potential, refractometry and viscometry. The presence of EtOH (nonsolvent) in aqueous solution of XG reduces the thermodynamic quality of solvent and increases the polymer-polymer contacts (i.e., elect...

The viscoelastic behavior of xanthan was carefully investigated in aqueous solutions (between 0.1% and 3% wt.) and in presence of extra-salt (NaCl) by following different thermal procedures. Thus, by a gradual rise of temperature, a sharp increase of the viscoelastic moduli was highlighted between 55 °C and 70 °C, depending on the polymer and salt...

Physical poly(vinyl alcohol) (PVA) hydrogels containing up to 3% Laponite RD (LRD) were obtained by freezing/thawing method. The structure and the morphology of PVA/LRD hydrogels were evaluated by ATR-FTIR and SEM measurements, respectively. The morphological analysis of the hydrogels revealed the formation of clay agglomerates and large size aggre...

The capillary viscometry and Fourier transform infrared spectroscopy in attenuated total reflection (ATR-FTIR) were used to investigate the conformation of xanthan gum (XG) chains in aqueous solutions, in the absence/presence of NaCl and in the temperature range from 25 to 90 °C. The content of acetate and pyruvate groups per side of XG was determi...

Poly(vinyl alcohol) (PVA) has attracted considerable research interest and is recognized among the largest volume of synthetic polymers that have been produced worldwide for almost one century. This is due to its exceptional properties which dictated its extensive use in a wide variety of applications, especially in medical and pharmaceutical field...

The present study has been focused on investigation of some polymer mixtures of interest for biomedical applications. Three pairs of polymers, namely: poly(vinyl alcohol) (PVA)/poly(vinylpyrrolidone) (PVP), PVA/hydroxypropyl cellulose (HPC), Pluronic F127 (PL)/HPC were subjected to viscometic study in dilute solution. The intrinsic viscosity, the H...

Poly(vinyl alcohol) (PVA) hydrogels were prepared in the presence/absence of Laponite RD (LRD) by using glutaraldehyde (GL) as chemical crosslinker. The effect of GL concentration (CHO/OH ratio between 0.02 and 0.38) and of clay addition on the PVA hydrogel properties was investigated. The swollen hydrogels showed good transparency and flexibility....

Polysaccharides and proteins are abundantly found in nature and are highly recommended for developing eco-friendly materials due to their special properties (biodegradability, biocompatibility, non-toxicity, low cost, etc.). However, they sometimes fail to meet specific requirements due to poor mechanical and physical properties. Poly(vinyl alcohol...

A series of hydrogels based on chitosan polyamine and nitrosalicylaldehyde were prepared via dynamic covalent chemistry (DCC), by imination and transimination reactions towards ordered clusters which play the role of crosslinking nodes of the chitosan network. The hydrogelation mechanism has been proved through NMR and FTIR spectroscopy, X-ray diff...

This study presents some rheological investigations concerning the temperature induced gelation for mixtures of Pluronic F127 and poly(vinyl alcohol) in aqueous solutions. At room temperature the polymer mixtures behave as viscous fluids and under physiological conditions they exhibit solid-like properties (elastic hydrogels). For a better understa...

The paper focusses on the synthesis of novel hydrogels by joining natural biodegradable compounds with the aim to achieve biocompatible materials for bio related applications. The hydrogels were prepared from chitosan and citral by constitutional dynamic chemistry, incorporating both molecular and supramolecular dynamic features. The hydrophobic fl...

Hydrogels based on chitosan and salicyladehyde were obtained by dynamic covalent chemistry. The unusual chitosan gelling in the presence of the monoaldehyde has been deciphered following and correlating data of NMR, FTIR, single crystal and wide angle XRD, POM and optical measurements. Of significant importance in understanding the crosslinking fea...

Intrinsic viscosities, generalized intrinsic viscosities and viscometric interaction parameters were measured for aqueous solutions of poly(ethylene oxide) [PEO], poly(N,N-dimethyl aminoethyl methacrylate) [PR] (uncharged) and for poly{[2-(methacryloyloxy)ethyl] trimethylammonium iodide} [PR⁺] (charged) within a wide range of molar masses. In this...

New reactive copolymers have been synthesized by copolymerization of two functional N-substituted-maleimides with styrene. These copolymers, with aldehyde and carboxyl functional groups, were further chemically modified with p-aminoazobenzene. After verification of the chemical structures by IR and ¹H-NMR spectroscopy, the copolymers were character...

Aqueous solutions of poly(vinyl alcohol) (PVA)/poly(vinylpyrrolidone) (PVP) mixtures containing up to 10% PVP were submitted to repeated freezing/thawing cycles in order to prepare physical hydrogels for potential biomedical applications. Porous structure of the PVA/PVP lyophilized samples and their morphology in cross-section and surface were eval...

Rheological behavior of poly(vinyl alcohol) (PVA) and poly(N-vinyl pyrrolidone) (PVP) mixtures in aqueous solutions and hydrogel state was investigated. The complex dependence of the viscosity on PVA/PVP mixture composition could be attributed to cumulative effects of electrostatic interactions, hydrogen bonding or association phenomena. Physical h...

The properties of xanthan gum (XG) aqueous solutions were investigated by using viscometric, electrokinetic and surface tension measurements. The effects of polymer concentration, temperature and pH on the viscosity of the XG solutions were evaluated and discussed. Zeta potential data determined for XG solutions in water in the temperature range of...

Chitosan based hydrogels are a class of cross-linked materials intensely studied for their biomedical, industrial and environmental application, but their biomedical use is limited because of the toxicity of different organic crosslinkers. To overcome this disadvantage, a new strategy to produce supramolecular chitosan hydrogels using low molecular...

Physical hydrogels were obtained by freezing/thawing of aqueous solutions of 15% poly(vinyl alcohol) (PVA)/ poly(vinylpyrrolidone) (PVP) mixtures with different ratios between the polymers. The rheological behavior was investigated after different numbers of freezing/thawing cycles at 37 C. An aging effect, which depends on PVP content into the pol...

Chitosan (CS) and poly(vinyl alcohol) (PVA) mixtures in acetic acid solution (AcAc) were investigated in order to determine the optimal composition required to design hydrogels in well-defined conditions. The main interest was to obtain materials which are in a liquid-like state at room temperature (injectable form) and transform into a gel at phys...

The paper is focused on the investigation of thermal induced gelation of Pluronic F127 and poly(vinyl alcohol) mixtures in aqueous solutions. In-situ thermal induced gelation process was investigated through rheological measurements, evidencing the optimum conditions for which the sol-gel transition occurs near the physiological temperature. The ge...

The effect of poly(ethylene oxide) (PEO) molecular weight on the viscoelastic properties of Laponite RD aqueous dispersion at 25 degrees C was investigated and discussed. PEO with molecular weight between 0.4x10(3) g/mol and 35x10(3) g/mol was added in concentration of 2% into 2.5% clay aqueous dispersion. The addition of polymer with molecular wei...

New composite materials based on biocompatible polymers type chitosan (CS), poly(vinyl alcohol) (PVA) and hydrotalcite-like anionic clays (MgAlLDH) have been prepared and their rheological and structural properties have been investigated. The viscoelastic properties of CS/PVA/MgAlLDH hybrids were studied at 37 �C in different conditions of pH. The...

The viscometric parameters of chitosan/poly(vinyl alcohol) mixtures determined at 37°C are sensitive to polymer composition and pH changes, giving information about interpolymer complexes formation. Hybrid composites based on interpolymeric chitosan/poly(vinyl alcohol) complexes and the inorganic matrix of layered double hydroxides were synthesized...

Poly(vinyl alcohol) (PVA) and poly(N-vinylpyrrolidone) (PVP) are two polymers possessing non-carcinogenic, non-toxic, excellent transparency, film-forming capacity, biocompatible and bioadhesive characteristics. Rheological behaviour of PVA and PVP aqueous solutions was investigated at 37 ºC as a function of PVA/PVP mixture composition. At high PV...

The solution behavior of water soluble polymers is influenced by the characteristics of the polymer chains as well as the environmental properties. Xanthan is one of the most studied water soluble charged polysaccharide due to unique properties generated by its structure. The primary structure of xanthan consists of a cellulose backbone bearing a...

Le poly(alcool vinylique) (PVA) présente un grand intérêt biomédical et pharmaceutique, en raison de sa biocompatibilité, sa bonne solubilité dans l’eau, ses caractéristiques de bioadhésion, sa relative facilité de mise en forme. Parmi les différentes formes d’utilisation du PVA en tant que biomatériau, les hydrogels physiques obtenus par des cycle...

This paper aims to investigate the possibility to modify the rheological properties of hydrogels based on Laponite RD/poly(ethylene oxide) by adding small amounts of chitosan to improve their elasticity. The continuous shear measurements of the hydrogels in the presence/absence of chitosan have revealed a pseudoplastic behavior with yield stress. T...

The application of Pluronic F127 as injectable gel-forming solution is limited by poor mechanical properties. The purpose of this study was to develop low viscosity formulations at ambient temperature that undergo a transition to gel under physiological conditions. Mixtures of Pluronic F127 and poly(vinyl alcohol) with different compositions were p...

To identify the occupational risks in an ambulance service and to assess their impact on the health of employees. Two marched groups (number, sex, age, length of exposure) from two different work sectors were selected. A 60 item questionnaire was used. The 60 items were grouped into four categories related to work organization, work environment, ne...

Rheological behaviour of poly(vinyl alcohol) (PVA) aqueous systems was systematically investigated at 30°C for different concentrations, molecular weights and hydrolysis degrees. The viscosity of very dilute polymer solutions was studied by means of viscometry, while the concentrated solutions were analyzed by steady shear flow measurements. The li...

The thixotropy and the yield stress of two aqueous dispersions of Laponite RD and Gelwhite H with the concentration of 5% were determined at 20 °C. The samples are shear thinning and the strong interactions between Laponite RD platelets in water explain the higher viscosity for this dispersion as compared with Gelwhite H one. In addition, the prese...

The paper investigates different formulations based on xanthan and Pluronic F127 in water in order to design elastic hydrogels with good stability at 37 °C. Sol-gel transition was investigated through the viscoelastic parameters as a function of temperature. By adding small amounts of xanthan into a Pluronic F127 solution, the transition point is s...

The thermodynamic behavior of chitosan in acidic aqueous solutions with ionic strengths between 0.04 x 10(-2) and 24.30 x 10(-2) M was investigated at 25 degrees C. The intrinsic viscosity and other thermodynamic parameters of chitosan with the molecular weight and the degree of acetylation of 7.14 x 10(5) g mol(-1) and 26%, respectively, were dete...

Synthesis of star polymers with a beta-cyclodextrin (CD) core was undertaken using the arm-first, then the core-first strategy. Cationic ring opening polymerisation (CROP) of 2-methyl-2-oxazoline (MeOx) was first initiated by allyl bromide, and then quenched with heptakis(6-deoxy-6-amino)beta-CD in order to get a 7-arm star polymer. Then heptakis(6...

The viscoelastic properties of 2% poly(ethylene glycol) aqueous solutions containing Laponite RD from 1% to 4% were investigated by oscillatory and flow measurements in the temperature range of 15-40 °C. The enhancement of the clay content from mixture causes the increase of the viscoelastic moduli and the change of the flow from liquid-like behavi...

This article investigates the viscoelastic behavior of poly(acrylonitrile) (PAN) and poly[N-(4-carboxyphenyl)maleimide] (PMI) solutions in dimethylformamide (DMF) in comparison with PMI/PAN/DMF ternary mixtures. Some rheological characteristics, such as viscosity and relaxation time, were investigated as functions of the polymer mixture composition...

Dextran and random dextran‐based copolymers containing different molar fractions f of charged units are studied in aqueous solution and in the pure state. The specific volumes of the solutions decrease linearly with increasing weight fraction of the polymer. Extrapolation to the pure state yields information on the hypothetical liquid polymers, exh...

In the present paper, the aqueous solutions of poly(oxyethylene) in different experimental conditions were investigated by viscometry and rheometry. The clusters formation was evidenced for fresh prepared samples which were not stirred or submitted to sonication. The time evolution of the viscoelastic parameters demonstrates that the history of the...

In this work, we investigated the behavior of poly(dimethylsiloxane-co-diphenylsiloxane)s under good and theta solvent conditions by using turbidimetry and viscosimetry. The evolution of the optical properties as a function of the solvent quality allowed the composition of the methylbenzene/methanol mixtures at the theta point to be determined. The...

Aqueous mixtures of Pluronic F127 and poly(vinyl alcohol) (20% polymer concentration in the system) were prepared and investigated by rheology and laser particle size distribution, in order to obtain temperature responsive gels for biomedical applications. The influence of the gelation conditions and system composition on the viscoelastic parameter...

In this work we investigate the effect of the solvent quality on the thermodynamic behavior of the polydimethyldiphenylsiloxane copolymer by using turbidimetry and viscosimetry. The turbidimetric method was used for the determination of the composition of the solvent mixture at the theta point. The experimental data obtained by using the capillary...

The paper investigates the hydrodynamic properties of polyacrylonitrile (PAN) and poly(N-(4-carboxyphenyl)maleimide) (PMI) solutions in dimethylformamide (DMF) in comparison with PMI/PAN/DMF ternary mixtures. The experimental data obtained by viscometry have been discussed by means of two methods: first, the plots obtained with the classical Huggin...

The thermodynamics of flexible polymers in solution have attracted the interest of many investigators. Because of its unique properties (low viscosity even at high molecular weight, high solubility in non-polar solvents, high volatility at low molecular weight, low surface tension, high refractive index, etc.), poly(dimethylsiloxane) has been the s...

The viscometric behaviour of polyacrylonitrile solutions in dimethylformamide has been examined in dilute and extremely dilute regimes of concentration. For semidilute and concentrated solutions, viscoelastic properties were determined and discussed. The overlap concentration was evidenced as being the crossover of two scaling laws characterizing t...

The rheological properties of two smectite -Laponite RD and Gelwhite H -aqueous dispersions with the concentration of 2.5% were studied at 20°C. The viscoelastic moduli showed that Laponite RD dispersion has the solid-like proper-ties and Gelwhite H dispersion is in liquid state at the concentration of 2.5%. The flow tests revealed that Laponite RD...

The behavior of polyvinyl alcohol aqueous solutions was investigated by viscometry. In region of very low polymer concentration, the reduced viscosity as a function of concentration deviates from linearity in the Huggins plots. The analysis of the concentration dependence of polymer solutions in terms of rel ln() η vs. concentration provides the po...

Separation studies of a clay suspension model using some cationic polysaccharides were performed by turbidity and zeta potential measurements. Floc size measurements at the optimum polycation dose were also carried out using laser diffraction technology. The investigated polyelectrolytes contained various amounts of quaternary ammonium salt groups,...

In this article, thermal-induced gelation of polyacrylonitrile (PAN) solutions in dimethylformamide was studied through rheological measurements. The entangled and non-entangled states were delimited for an overlap parameter of macromolecular coils of 2.7. In temperature sweep experiments, two types of gelation processes were identified for PAN ent...

Most technical polymers and many biopolymers contain very different molecular species (unlike chain length, molecular architecture and/or chemical composition) in contrast to pure low molecular weight compounds. This inconsistent constitution of macromolecules proves very adverse in many cases. An adequate fractionation of polydisperse polymers is...

In this article, thermal-induced gelation of polyacrylonitrile (PAN) solutions in dimethylformamide was studied through rheological measurements. The entangled and non-entangled states were delimited for an overlap parameter of mac-romolecular coils of 2.7. In temperature sweep experiments, two types of gelation processes were identified for PAN en...

Experimentally obtained islands of immiscibility are reported for the systems PS/PVME/THF at 20 °C and for PS/PVME/CH at 55 °C (PS: polystyrene, PVME: poly(vinyl methyl ether), THF: tetrahydrofuran, CH: cyclohexane). THF is a good solvent and CH is a marginal solvent for both polymers. In the case of THF, information on the Flory−Huggins interactio...

Rheological properties and zeta potential were investigated for 1 % Laponite RD aqueous dispersions with different contents of poly(ethylene glycol). At low concentrations of polymer (< 1 %), the clay dispersions are stable, whereas an unstable liquid phase appears above 2 % polymer. The samples present a Newtonian behavior, showing more viscous th...

The viscoelastic behavior of poly(N-(4-formylphenoxy-4′-carbonylphenyl)maleimide-co-styrene) and poly(N-(4-carboxyphenyl)maleimide-co-styrene) in dimethylsulfoxide is investigated. The rheological parameters (elastic modulus, viscous modulus, loss tangent) were determined at different temperatures in the range 20°C–80°C. Poly(N-(4-carboxyphenyl)mal...

The viscometric behavior of polyacrylonitrile solutions in dimethylformamide at 25°C has been examined at high dilutions. The reduced viscosity—concentration curves are strongly dependent on the flow conditions, being influenced by the viscometer capillary size. The observed viscosity abnormality in the extremely dilute concentration regime is also...

The effect of water (as non-solvent) on the dynamic behaviour of polyacrylonitrile solution in dimethylformamide was investigated. At low temperatures (< 0°C), the gelation becomes faster in presence of small content of water (up to 3%). The sol-gel transition was investigated at 5 − °C in function of water concentration through the evolution of th...

The influence of poly(ethylene oxide) the aggregation and gelation of Laponite RD aqueous dispersions temperature in the range 10°C-50°C using rheology, under different experimental conditions is studied. PEO adsorbs onto the Laponite particles and inhibits aggregation by steric hindrance. The diminution of the aggregation phenomenon depends on the...

The flow behavior of poly(ethylene oxide) (PEO)-Laponite RD-water mixtures with polymer concentrations between 0.05 wt% and 1 wt% in the range of temperature 100C-50 degrees C is investigated. The evolution of the elastic modulus, the viscous modulus and the loss tangent as a function of oscillation frequency for the studied mixtures gives some ind...

The dynamic behavior of polyacrylonitrile solutions in dimethylformamide was investigated at different temperatures. For low polymer concentrations, the viscoelastic parameters as a function of the oscillation frequency at different temperatures have a typical behavior of the most polymer solutions. With increasing of polymer concentration, two typ...

The effect of poly(ethylene oxide) with M n =35 000 g/mol added to an aqueous laponite clay dispersion was investigated at pH=7. The results have shown that the viscoelastic properties of clay dispersion obtained in oscillatory measurements are influenced by the presence of the polymer. For 0.1 ω > rad/s, formation of gel in the poly(ethylene oxide...

The synthesis of a maleimide with an aldehyde pendant group, N-(4-formylphenoxy-4′-carbonylphenyl)maleimide (FCPMI), was described. Two copolymers were obtained by the copolymerization of N-(4-formylphenoxy- 4′-carbonylphenyl)maleimide with styrene (St) (copolymer I) and N-vinyl-2-pyrrolidone (NVP), respectively (copolymer II). The copolymerization...

Two functional N-substituted maleimide monomers, namely N-(4-carboxyphenyl)maleimide (CPMI) and N-(4-formylphenoxy-4′-carbonylphenyl) maleimide (FCPMI), were copolymerized with N Vinyl-2-pyrrolidone (NVP) at 90° C in the presence of 2,2′-azobisisobutyronitrile as initiator in dimethylformamide. The monomers reactivity ratios were calculated by exte...

The metal complexation ability of some N-substituted maleimides containing a carboxyl group was investigated. Thus, N-(4-carboxy-phenyl)-maleimide, N-(3-acetoxy-4-carboxy-phenyl)-maleimide and poly[N-(3-acetoxy-4-carboxy-phenyl)-maleimide] were prepared and complexed with several transition metals, such as Co2+, Ni2+ and Cu2+. The formation of comp...

The variation of ln[ ] η with temperature for poly(methyl methacrylate) and copolymers of 2-(o-chlorophenyl)-4-methylene-1,3-dioxolane with methyl methacrylate is discussed using the theories of excluded volume effect. Both 2 o d ln r / dT < > and Θ temperature are evaluated from this analysis.

Copolymers of 2-(o-chlorophenyl)-4-methylene-1,3-dioxolane with methyl methacrylate and styrene were synthesized in benzene at 85 °C in the presence of 2,2′-azobisisobutyronitrile as initiator. The structure of the resulting copolymers was investigated and a polymerization mechanism was proposed. The intrinsic viscosity of the copolymers in dilute...

The article is concerned with the conformational characteristics of polyacrylonitrile in dilute solutions of dimethylformamide at 25°C. The excluded volume effects on the intrinsic viscosity of oligo- and polyacrylonitrile were quantitatively explained by the Yamakawa theory that takes into account the effects of chain ends and chain stiffness. The...

A new functional monomer derivative of p-aminosalicylic acid, N-(3-acetyl-4-carboxy-phenyl)-maleimide, was synthetized and polymerized with azobisisobutyronitrile as initiator at 60 °C in various solvents. The obtained structures were confirmed by IR, 1H-NMR and elemental analysis. The molecular weights and the polydispersity values of the polymers...