Gautam Sen

• Birla Institute of Technology, Mesra

2-(methacryloyloxy) ethyl] trimethylammonium chloride (MAETMAC) was grafted onto the casein backbone using the microwave-assisted technique. It was studied as a bio-based wood binding adhesive for fabrication of single standard lap joints. The hyper branched polymer network formed post grafting facilitated strong adhesion and enhanced the water hol...

The present work focuses on comparing the performance of novel cationic graft copolymer polyvinylpyrrolidone-graft-poly(acrylamide-co-diallyldimethylammonium chloride) (PVP-g-p(AM-co-DADMAC)) synthesized via microwave-assisted technique, with varying amounts of monomers acrylamide (AM) and diallyldimethylammonium chloride (DADMAC) as a flocculant f...

In this research paper, we endeavor to publish our work on non-acrylamide based flocculant which, does not threaten any acrylamide release and thus is inherently safer. A novel cationic graft copolymer Polydiallyldimethylammoniumchloride grafted Gum Ghatti [GGt-g-P(DADMAC)] was synthesized using a 'microwave assisted' technique. Both GGt and DADMAC...

In this research paper we endeavor to publish our work on novel non acrylamide based flocculant which does not threat any acrylamide release and thus is inherently safer. A novel flocculant ‘Polydiallyldimethylammonium Chloride grafted Carboxymethyl Cellulose [CMC‐g‐P(DADMAC)]’ was synthesized by both conventional and microwave assisted method. Bot...

This study includes the application of graft copolymer (polyacrylamide grafted polyvinyl pyrrolidone- PVP-g-PAM) as wound healing agent. It is hypothesized that the branches of the graft copolymer adsorbs at various colloidal components of blood plasma – thus assisting in formation of a networked structure i.e., ‘blood clot’. Further, the adhesive...

Alum and other inorganic coagulants have been in use for water treatment since time immemorial. However, exposure to the consecutive metal ions results in chronic effects, the well known of which is Alzheimer’s disease. Alternatives to these coagulants are biopolymer based graft copolymer as flocculant. They are required in minute dosage, non-toxic...

The release attributes of anticancer therapeutic embedded in programmable gum ghatti hydrogel matrices has been evaluated. Hydrogel has been programmed simply by adjusting the product composition (monomer-acrylamide and crosslinker- N, N Methylenebisacrylamide (MBAm)) to control mesh size during copolymerization of gum through microwave based techn...

To circumvent the problems (such as volatilization, photolytic decomposition, chemical instability, easy permeability through the skin) associated with low molecular weight antimicrobial agents, our strategy employed graft copolymerization of cationic monomer with the polymeric substrate viz. psyllium husk. The surface graft concentration of quater...

flocculation

This study investigates the real potential of synthesized hydrolyzed graft copolymer (Hyd.PVP-g-PAM) as flocculant in destabilization of aqueous suspension of nanoparticles (multi-walled carbon nanotubes or MWCNTs). A novel product (Hyd.PVP-g-PAM) has been synthesized by partial alkaline hydrolysis of a preformed graft copolymer of polyvinyl pyrrol...

Hydrogels are primarily synthesized to retain large amounts of aqueous solution. Depending upon modes of synthesis, the hydrogel materials develop various types of network structure. Recently, popular techniques have been developed for synthesis of hydrogels in the presence of crosslinking agents or multifunctional co-monomer which acts as a crossl...

Microbial contamination, the consequences of both anthropogenic and geogenic activity, includes high health and environmental threats and may adversely affects the ecological niche. The present work is a successful attempt towards the fabrication of anti-bacterial agent by incorporation of cationic monomer, diallyldimethylammonium chloride (DADMAC)...

This article presents a successful endeavour towards destabilization of an aqueous suspension of carbon nanoparticles via synthesized hydrolyzed graft copolymer (Hyd. GGI-g-PAM) of gum ghatti. Flocculation proficiency of the preformed graft copolymer of gum ghatti (GGI-g-PAM) has been amplified via partial alkaline hydrolysis that helps in straight...

Mycotoxins, the toxic metabolites of filamentous fungi have deleterious and persistent effects not only on human being but also on other vertebrates and invertebrates including plants and micro-organisms. Agricultural commodities may easily get contaminated during both pre and post-harvest. Presently, over 300 mycotoxins are identified. Internation...

This work describes the significance of graft copolymer induced flocculation process in sugarcane juice clarification. The naturally occurring cinnamic acid has been successfully incorporated into the structure of sesbania gum through microwave assisted technique (hybrid of conventional and microwave based method) to develop novel, non-toxic, eco-f...

The purpose of this study is to fabricate 5-Fluorouracil sustained release matrix based on a novel, nontoxic, eco-friendly modified biopolymer. The sesbania gum based hydrogel has been prepared by microwave assisted method using acrylamide as a monomer and N,N Methylenebisacrylamide as a crosslinker. The crosslink copolymerization has been confirme...

In the processing of sugarcane juice for the manufacture of white sugar, clarification is an essential step to eliminate unwanted solids from the essential sugar solution. Applicability of graft copolymer of sodium alginate was studied for this clarification step. Cinnamic acid grafted sodium alginate (SAG-g-P (CA)) was prepared by microwave assist...

In the present investigation, we have synthesized polymethylmethacrylate grafted barley (BAR-g-PMMA) using ceric ammonium nitrate as an initiator and methyl methacrylate as monomer in the presence of nitrogen atmosphere. The different grades of polymethylmethacrylate grafted barley were prepared by varying the concentration of initiator and monomer...

The conventional biotechnology and the advanced agricultural practices may not be sufficient to meet the rising and expected high protein demands. Presently mushroom has occupied a high status because of its nutritive value i.e. it is rich in protein and fiber along with several vitamins and minerals contents, it contains virtually no fat and chole...

The conventional biotechnology and the advanced agricultural practices may not be sufficient to meet the rising and expected high protein demands. Presently mushroom has occupied a high status because of its nutritive value i.e. it is rich in protein and fiber along with several vitamins and minerals contents, it contains virtually no fat and chole...

A novel graft copolymer- polyacrylamide grafted gum tragacanth (GT-g-PAM) was fabricated by microwave assisted method i.e., grafting initiated by a synergism of chemical free radical initiator and microwave radiation. The synthesized graft copolymer has been characterized through various physico-chemical techniques such as intrinsic viscosity measu...

Graft copolymerization and simultaneous crosslinking of polyvinyl pyrrolidone (PVP) have been carried out by microwave assisted method. The pore size and thus the functional properties of hydrogels were customized exclusively for Cr(VI) and As(III) ions abstraction by varying the concentrations of monomer and crosslinker, thus enabling selective en...

Cinnamic acid grafted carboxymethyl cellulose (CMC-g-P (CA)) has been synthesized by microwave assisted technique, which is an alliance of microwave radiation with chemical free radical initiator (CAN) to commence grafting. The novel graft copolymer has been characterized by physicochemical techniques – FTIR spectroscopy, intrinsic viscosity measur...

Graft copolymers obtained by the modification of agar are attractive materials because of their unique physicochemical advantages or enhanced properties compared to their original precursor counterpart. Microwave-irradiated grafting techniques are reliable, easy to operate, rapid, highly reproducible, economically viable, and ecofriendly compared t...

Polyacrylamide-grafted barley (BAR-g-PAM) was synthesized by ceric ion-based conventional method. The grafting of polyacrylamide chains on the polysaccharide backbone was confirmed through various physicochemical techniques such as intrinsic viscosity measurement, 13C-NMR spectra, FTIR spectroscopy, elemental analysis, scanning electron microscopy...

The synthesis of cationic inulin (CI) and its application in algal biomass harvesting has been investigated. (3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHPTAC) was used as the etherifying reagent to introduce quaternary amine groups onto the backbone of the biopolymer. The resulting cationized adduct was characterized by various physico...

Synthesis of polyacrylamide (PAM) grafted soya peptone was performed by the microwave assisted method using ceric ammonium nitrate (CAN) as free radical initiator. The synthesis was optimized by varying the acrylamide and CAN concentration. The grafting of the PAM chains on the peptone backbone was confirmed through various physicochemical techniqu...

Agar has been modified by microwave assisted grafting with acrylamide monomer, resulting in poly acrylamide grafted agar (Ag-g-PAM). The synthesized grades of Ag-g-PAM were characterized by standard physico-chemical characterization techniques (FTIR spectroscopy, elemental analysis, scanning electron microscopy (SEM)) to ascertain the intended graf...

Polyacrylamide grafted inulin (In-g-PAM) was synthesized via aqueous microwave assisted method (using ceric ammonium nitrate in synergism with microwave in aqueous medium). The intended grafting of the PAM chains on polysaccharide backbone was confirmed through standard physicochemical characterization techniques, namely intrinsic viscosity measure...

Green unicellular microalgae have a capacity to entrap CO2 to increase their biomass through photosynthesis and are important for the value added product. The presence of COOH and NH2 groups are responsible for imparting negative zeta value. The present work emphasizes on the synthesis of cationic cassia (CCAS) by the insertion of quaternary amine...

Carboxymethyl Inulin (CMI) has been synthesized by incorporation of carboxymethyl groups in the inulin framework; by reacting inulin with sodium salt of monochloro acetic acid (SMCA) in presence of sodium hydroxide. The resulting carboxymethylated product, with different degrees of substitution, has been confirmed through various physicochemical ch...

Synthesis of graft copolymers under the influence of microwave radiation alone is a rapid, efficient, clean, cheap, convenient, energy-saving and green method. Grafting of Poly (2-Hydroxyethylmethacrylate) on agar backbone was carried out under the influence of microwave radiation. The synthesis is optimized in terms of percentage grafting and intr...

Modification of the milk protein 'casein' has been carried out through microwave initiated graft copolymerization of acrylamide. The synthesis was optimized in terms of microwave irradiation time and monomer (acrylamide) concentration. The synthesized graft copolymers have been characterized by intrinsic viscosity measurement, elemental analysis, F...

Polyacrylamide grafted oatmeal (OAT-g-PAM) was synthesized by conventional method. The grafting of the PAM chains on the biomaterial backbone was confirmed through intrinsic viscosity study, FTIR spectroscopy, elemental analysis (C, H, N, S and O), SEM morphology and TGA study. The intrinsic viscosity of oatmeal appreciably improved on grafting of...

Polymethyl methacrylate grafted sodium alginate (SAG-g-PMMA) was synthesized by microwave assisted method. The grafting of the PMMA chains on the polysaccharide backbone was confirmed through intrinsic viscosity study, FTIR spectroscopy, elemental analysis (C, H, N, O and Na), SEM and TGA study. The intrinsic viscosity of sodium alginate appreciabl...

Polyacrylamide grafted Agar (Ag-g-PAM) has been successfully synthesized by conventional method and microwave assisted method. The former method employs ceric ammonium nitrate (CAN) as the free radical initiator while the latter uses the combination of ceric ammonium nitrate (CAN) and microwave irradiation. The synthesized graft copolymers have bee...

Microalgae may be the source of high amount of lipid and protein. It has the property for carbon dioxide sequestration, recycling and also can remove pollutants from wastewater. Using traditional methods, collection of algal biomass is either cost effective, time consuming or may be toxic due to use of chemical salts. The aim of this study is to ha...

Polyacrylamide chains (PAM) were grafted onto the backbone of gum ghatti by microwave assisted method. The grafting of the PAM chains on the polysaccharide backbone was confirmed through intrinsic viscosity study, FTIR spectroscopy, elemental analysis (C, H & N) and SEM morphology study. The intrinsic viscosity of gum ghatti appreciably improved on...

Introduction: Polysaccharides as a Material of the Future Modified Polysaccharides Characterization of Grafted Polysaccharides Application of Grafted Polysaccharides Conclusion

An environmentally benign and efficient route of synthesis of polyacrylic acid grafted carboxymethyl cellulose (CMC-g-PAA) is developed using microwave radiation alone to initiate the grafting reaction. The synthesis is optimized in terms of percentage grafting and intrinsic viscosity, by varying the microwave irradiation time and monomer (acrylic...

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief. Panels PAM, SAG and CMS-g-PAM (M) of Figure 1 do not appear to be original. Panel PAM from Figure 1 appears similar to p...

This paper reports a novel microwave initiated method for synthesis of polyacrylamide grafted Psyllium (Psy-g-PAM). Psyllium was modified through grafting of polyacrylamide (PAM) chains on it using microwave radiations only, in absence of any other free radical initiator. The grafting was confirmed by intrinsic viscosity study and characterization...

A high performance polymeric flocculant has been developed by partial alkaline hydrolysis of polyacrylamide grafted carboxymethylstarch (CMS-g-PAM). The optimized grade was determined through its higher intrinsic viscosity in solution. Various grades of this hydrolyzed graft copolymer were prepared by varying the reaction parameters. The hydrolyzed...

Grafting of polyacrylamide (PAM) chains was performed onto the backbone of Agar by microwave assisted method, using microwave radiation in synergism with ceric ammonium nitrate (CAN) as the chemical free radical initiator. The intended grafting of the PAM chains were confirmed through intrinsic viscosity study, FTIR spectroscopy and elemental analy...

Guar gum was grafted with polymethylmethacrylate (PMMA) by microwave initiated method. The synthesis was optimized for highest percentage grafting, by varying the microwave irradiation time and monomer (methyl methacrylate) concentration. The various grades of grafted product (GG-g-PMMA) were characterized through standard physicochemical character...

Novel biodegradable polymeric flocculants were produced by conventional redox grafting, microwave-initiated and microwave-assisted grafting of acrylamide to tamarind kernel polysaccharide (TKP). The graft copolymers were characterized by viscometry, elemental analysis, molecular weight determination using SLS analysis, and NMR spectroscopy. The flo...

Polyacrylamide grafted starch (St-g-PAM) was made by a novel method of synthesis, involving combination of microwave radiation and a chemical free radical initiator (ceric ammonium nitrate) to initiate grafting reaction. This method (microwave assisted synthesis) is quick, highly reliable, reproducible and yields high quality product as compared to...

This paper details the study of applicability of microwave initiated synthesized polyacrylamide grafted guar gum (GG-g-PAM) as matrix for controlled release of 5-amino salicylic acid (a drug used for the treatment of ulcerative colitis). In vitro release of this drug from various grades of GG-g-PAM has been studied by USP dissolution method (paddle...

Microwave-initiated synthesis of polyacrylamide-grafted sodium alginate, a graft copolymer with wide variety of applications has been reported in this study. The effect of reaction parameters (i.e., irradiation time and monomer concentration) onto the percentage grafting has been investigated. The resulting polymer has been characterized by a varie...

This study reports investigation of the sustained release behavior of a model drug (acetylsalicylic acid) from carboxymethylstarch (CMS) based matrix. CMS was prepared by incorporation of carboxymethyl groups in the starch moiety; by reacting starch with sodium salt of monochloro acetic acid in presence of sodium hydroxide. The in vitro drug releas...

Synthesis of cationic tamarind kernel polysaccharide (Cat TKP), its detailed physicochemical characterization and application as an efficient flocculant for the treatment of textile industry wastewater have been investigated. N-3-Chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) was used as a cationic reagent to introduce quaternary amine...

This paper reports the investigation of microwave initiated synthesized polyacrylamide grafted carboxymethylstarch (CMS-g-PAM) as matrix for sustained drug release. 'In vitro' release of a model drug (5-amino salicylic acid) from CMS-g-PAM matrix has been studied. It is evident that higher the percentage grafting, more sustained is the rate of drug...

Novel functionalized polymeric flocculants based on polyacrylamide grafted carboxymethylstarch (CMS-g-PAM) have been successfully synthesized via conventional method (using ceric ammonium nitrate as free radical initiator, in an inert atmosphere) as well as by using microwave irradiation (‘microwave initiated’ synthesis). Under optimal grafting con...

Water is scarce commodity now. Recycling of municipal wastewater, industrial and mineral processing effluents require treatment with the inorganic or organic flocculants. Both synthetic and natural polymers are used as flocculants. Natural polymers are biodegradable and are effective at very large dosages but are very shear stable. The synthetic po...