Naima Belhaneche-Bensemra

Ecole Nationale Polytechnique · Génie de l'Environnement, El-Harrach, Alger, (Algeria)

Plasticizers are used to make Poly (Vinyl Chloride) (PVC) flexible so it can be used in different areas such as intravenous solution containers. Plasticizers can migrate from PVC over time because of contact with these solutions; this phenomenon creates gaps in the polymer structure and causes the migration of other additives. This paper discusses...

The present work studies the synthesis of biopolyols based on epoxidized sunflower oil (ESFO) and obtained via alcoholysis reaction. The ring opening reaction ESFO (with an oxirane index: O.O% of 6.2%) was carried using an alcohol solution and boron trifluoride (as catalyst). The operatory conditions of synthesis were optimized using a design of ex...

This study aims the valorization of diss fibers for the production of biocomposites based on blends of recycled and regenerated low density polyethylene (rLDPE) and polypropylene (PP). Thus, the study of different diss fibers treatments was carried out to achieve the best performance of the final biocomposites. The polymeric blends were prepared by...

The main purpose of this work was the valorization of waste wood flour as reinforcement in order to develop new wood‐based polymer composites (WBPCs). For that purpose, low‐density polyethylene/poly(lactic acid) (LDPE/PLA) blends were prepared in presence of poly(ethylene‐co‐glycidyl methacrylate) (PE‐g‐GMA) as compatibilizer and reinforced with 0–...

The aim of this work is the valorization of diss fibers with recycled and regenerated low-density polyethylene (rLDPE) for the development of biocomposites based on blends of rLDPE polypropylene (PP) and diss fibers. The diss fibers were characterized by laser granulometer and FTIR spectroscopy. Two PP/rLDPE blends of different compositions (50/50...

The aim of this work is to develop biocomposites based on modified sunflower oil as resin and short natural fibers from Alfa plants (Stipa tenacissima) as reinforcement. Epoxidized sunflower oil (ESFO) was chemically modified via acrylation reaction to obtain acrylated epoxidized sunflower oil resin (AESFO). The AESFO resin was then copolymerized w...

The aim of this work was to study the interactions between polypropylene (PP) food packaging for fatty products (margarine) and food simulant. For this purpose, a simulant (olive oil) was used in two different temperatures (20°C and 40°C). The interaction phenomena were investigated according to the rate of mass variation of PP samples with time an...

The aim of this work is to study the effects of calcium stearate (CaSt 2 ) as pro-oxidant agent on the degradation of polypropylene (PP) under natural exposure. For that purpose, PP samples containing various amounts of CaSt 2 were prepared and exposed in Boumerdes, Algeria (Mediterranean climate) for 12 months. Samples were taken off every 3 month...

Pure starch has been isolated from different samples: oak acorn, sorghum, and potato using alkali steep and wet-milling procedure. The structure of the extracted starches was analyzed using Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction. Their physicochemical properties (water content, ash content, pH, amylose content, swelli...

In the first step of this work, Commercial sunflower oil was epoxidized, and epoxidized sunflower oil (ESO) was used as a thermal stabilizer for poly (vinyl chloride) (PVC). Plasticized formulations stabilized with ESO as a new biodegradable stabilizer and epoxidized soya bean oil (ESBO) as a commercial stabiliser for comparison were realized. Two...

The main purpose of this work was to evaluate the long term performance of butt welded polyethylene (PE) pipes in comparison to non-welded counterparts. Therefore, old welded PE pipes with different ages that had been used in Algerian gas distribution systems for up to 30 years were investigated. Samples prepared by butt welding of unaged pipes wer...

This work is therefore in order to study the partial replacement of the plasticizer ordinarily used di-octyl phtalate (DOP) by the permanent plasticizers EVA and ABS in order to reduce migration of additives initially contents in polyvinyl chloride (PVC) stabilized with expoxidized sunflower oil (ESO). Migration tests with agitation to 40° C in sun...

This work deals with the valorization of waste jute fibers coming from carpet industries in the development of biocomposites based on blends of low-density polyethylene and poly lactic acid. First, low-density polyethylene /poly lactic acid blends of variable composition (100/0, 80/20, 50/50, 20/80, 0/100) were prepared. Their tensile properties an...

Hybrid structures based on polythiophene modified porous silicon was used for the electrochemical detection of para-nitrophenol, which is a toxic derivative of parathion insecticide and it is considered as a major toxic pollutant. The porous silicon was prepared by anodic etching in hydrofluodic acid. Polythiophene films were then grown by electrop...

The aim of this work is to study the valorisation of two regenerated low density polyethylene (LDPE) coming from dirty wastes by blending with polypropylene (PP) in presence of compatibilizer. The first step was the determination of the physico-chemical properties of the two regenerated samples (density, melt flow index, water absorption, melting t...

Plasticizers play a key role in the formulation of polymers and in determining their physical properties and processability. This study examines the effect of di(2-ethyl hexyl) phthalate (DEHP) as plasticizer on the thermal and mechanical properties of PVC/PMMA blends. For that purpose, blends of variable composition, from 0 to 100 wt%, were prepar...

The thermal stability and kinetic parameters for degradation of rigid and plasticized poly(vinyl chloride)/poly (methylmethacrylate) blends have been investigated by using nonisothermal thermogravimetry in a flowing atmosphere of air. For that purpose, blends of variable composition from 0 to 100 wt% were prepared in the presence (15, 30, and 50 wt...

Commercial sunflower oil was epoxidized, and the epoxidized oil (ESO) was used as a new thermal stabilizer for poly(vinyl chloride) (PVC). Plasticized formulations stabilized with ESO and epoxidized soya bean oil as a commercial stabilizer were evaluated for comparison. Two plasticizers were used, dioctyl phthalate and diisononyl adipate. The aging...

Commercial sunflower oil was epoxidized and the epoxidized sunflower oil (ESO) was used as a thermal stabilizer for poly(vinyl chloride) (PVC). Rigid and plasticized formulations stabilized with ESO as a new biodegradable stabilizer and epoxidized soya bean oil (ESBO) as a commercial stabiliser were compared. Two plasticizers were used: dioctyl pht...

This work consists in elaborating a gas sensor based on porous silicon and a polypyrrole obtained by covalent grafting and studying its answer in different environments. At first, we were interested in the formation of the nanoporous layers by cyclovoltammetric (CV) in a hydrofluoric acid solution followed by an electrochemical grafting of the poly...

Activated carbon was prepared from ground-coffee in this study. Experimental results reveal that for the ratio (0, 1 ÷ 0, 3) of coffee grounds to activating agents (ZnCl<sub align="right"> 2 </sub>, H<sub align="right"> 3 </sub>PO<sub align="right"> 4 </sub>) has not noteworthy influence. The rise temperature and carbonisation time respectively, in...

Commercial sunflower oil was epoxidized at the laboratory-scale. The epoxidized sunflower oil (ESFO) was modified following the acrylation reaction. Modification was carried out simultaneously using acrylic acid (AA) and triethylamine (TEA). To optimize the reaction conditions, the effects of four temperatures (40, 60, 80, and 100 °C), the ESFO:AA...

This paper concerns the valorization of two regenerated low-density polyethylene (rLDPE) samples coming from dirty wastes by blending with polystyrene (PS) in the presence of a compatibilizer. The first step consisted in the determination of the physico-chemical properties of LDPE samples (density, melt flow index, water absorption and level of oxi...

Polyethylene (PE) is the highest volume thermoplastic consumed in the world, constituting the dominant component of plastics wastes. It is becoming the most recycled polymeric material. Polymer blends are becoming commercially important because they offer a property balance not found in either homopolymer. Furthermore, blending technology is used t...

Polyvinyl chloride (PVC) is a versatile material that can be formulated for various applications, ranging from every day products to highly specialized ones. In addition to the polymeric component, low molecular compounds such as stabilizers, lubricants, plasticizers... are added for processing and achieving the desired chemical and mechanical prop...

Commercial sunflower oil was epoxidized, and epoxidized sunflower oil (ESO) was used as a thermal stabilizer for polyvinyl chloride (PVC). This work describes a process capable to reduce the additives migration between plasticized PVC stabilized with ESO and food simulants. For that purpose, samples were first soaked in n-heptane and then dried. So...

This paper reports work studying the partial substitution of the commonly used plasticiser di-octyl phtalate (DOP) by the permanent plasticisers ethylene-vinyl-acetate (EVA) and acrylonitrile-butadiene-styrene (ABS) in order to reduce migration of additives initially present in poly(vinyl chloride) (PVC) stabilised with epoxidised sunflower oil (ES...

Viscoelastic properties, morphology, and thermal stability of rigid and plasticized poly(vinyl chloride)/poly (methyl methacrylate) (PVC/PMMA) blends were studied. For that purpose, blends of variable composition from 0 to 100 wt% were prepared in the presence (15, 30, and 50 wt%) and in the absence of di(2-ethylhexyl) phthalate as plasticizer. The...

The paper reports on a novel localized surface plasmon resonance (LSPR) substrate architecture for the immobilization and detection of histidine-tagged peptides. The LSPR interface consists of an ITO (indium tin oxide) substrate coated with gold nanostructures. The latter are obtained by thermal deposition of a thin (2 nm thick) gold film followed...

The industrial crops of microalgae use processes calling upon the presence of parts of metal nature such as steel 316L type. The goal of this study is to test the electrochemical behavior of this material in a marine culture of microalgae. Porphyridium purpureum was used under a photoperiod of alternation darkness/light 12/12 h, in order to apprehe...

Commercial sunflower oil was epoxidized, and the epoxidized sunflower oil (ESO) was used as a thermal stabilizer for poly(vinyl chloride) (PVC). Rigid formulations stabilized with ESO as a new stabilizer and epoxidized soybean oil (ESBO) as a commercial stabilizer for comparison were prepared. The aging of the PVC samples was investigated in landfi...

To assess the protein quality and the nutritive value of seven Algerian local sorghum cultivars, the in vitro pepsin digestibility was determined, which ranged from 25.0% to 65.0%, and the amino acid composition of each cultivar was compared with other sorghum cultivars. In addition, the amino acid scores (AAS) and the protein digestibility-correct...

The aim of this paper is the determination of the specific migration of epoxidized sunflower oil (ESO) from rigid and plasticized poly(vinyl chloride) (PVC) into food simulants. ESO was obtained by epoxidation of commercial sunflower oil and used as a thermal organic co-stabilizer for PVC. For that purpose, rigid and plasticized (0, 15, 30, and 45...

Triethyl citrate (TEC) and acetyl tributyl citrate (ATBC) were used as plasticizer for poly(lactic acid) (PLA). The treated and plasticized PLA at various concentrations were analyzed by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and opacity. DS...

An XIP (xylanase inhibiting protein) type xylanase inhibitor was purified from Algerian pearl millet ( Pennisetum glaucum L.) grains and characterized for the first time. Cation exchange and affinity chromatography with immobilized Trichoderma longibrachiatum glycoside hydrolase (GH) family 11 xylanase resulted in electrophoretically pure protein w...

The thermal degradation of rigid and plasticized poly(vinyl chloride) (PVC)/poly (methyl methacrylate) (PMMA) blends was investigated by means of isothermal and dynamic thermogravimetric analysis in a flowing atmosphere of air. For that purpose, blends of variable composition from 0 to 100 wt% were prepared in the presence (15, 30 and 50 wt%) and i...

Commercial sunflower oil was epoxidized, and epoxidized sunflower oil (ESO) was used as a thermal stabilizer for polyvinyl chloride (PVC). Semirigid and plasticized formulations stabilized with ESO were realized. Three plasticizers were used: dioctyle phthalate (DOP), diisodecycle phthalate (DIDP), and diisononyle adipate (DINA). Leaching tests sim...

Semirigid and plasticized poly(vinyl chloride) (PVC) samples, stabilized with epoxidized sunflower oil (ESO), Zn, and Ca stearates, were exposed in Algiers (hot, Mediterranean climate) for 12 months in three sites where the concentrations of atmospheric pollutants (NOx, O3, hydrocarbons) are known. The evolution of the mechanical properties (tensil...

The aim of this work is to study the valorization of regenerated low density polyethylene (rLDPE) by blending with PVC in the presence of chlorinated polyethylene (CPE) as compatibilizer. For this purpose, four rLDPE samples coming from neat or dirty wastes were used. They were obtained after milling, washing, and extrusion in a conventional recycl...

Sunflower oil is a renewable resource that can be epoxidised. Epoxidised sunflower oil has the potential for use as an environmentally friendly, reactive material in polymer I c formulations. Sunflower oil of iodine value 130 was epoxidized in situ, with preformed peracetic acid, or using a mixed strategy, to determine the optimisation of double bo...

Sunflower oil (SO) is a renewable resource that can be epoxidized, and the epoxidized SO has potential uses as an environmentally friendly and reactive material in polymeric formulations, especially for polyvinyl chloride. SO was epoxidized with peracetic acid, which was either preformed or prepared in situ. In order to optimize the formation of ox...

The present work aims to the valorization of regenerated low density polyethylene (LDPE) by blending with small quantities of ethylene-propylene-diene monomer (EPDM). Three types of regenerated LDPE (rLDPE) from different waste sources (greenhouses, milk pouches,...) were characterized in terms of physico-chemical (density, melt flow index, water a...

This paper deals with the miscibility of polyvinyl chloride (PVC) with polymethyl methacrylate (PMMA). Blends of variable compositions from 0 to 100 wt% were prepared in the presence (15, 30 and 50 wt%) and in the absence of di ethyl- 2 hexyl phtalate as plasticizer. Their miscibility was investigated by using various analytical methods: determinat...

Commercial sunflower oil was epoxidised and used as organic co-stabiliser for rigid and plasticised poly(vinyl chloride) (PVC) containing Zn and Ca stearates as primary stabilisers and stearic acid as lubricant. For applications in the packaging of foodstuffs, migration testing must be performed. The detection and the quantification of contaminants...

The aim of this work was to study the thermo-oxidative dehydrochlorination of rigid and plasticised poly(vinyl chloride)/poly(methyl methacrylate) blends. For that purpose, blends of variable compositions from 0 to 100wt% were prepared in the presence (15, 30 and 50wt%) and in the absence of diethyl-2-hexyl phthalate as plasticiser. Their miscibili...

In a wiped film apparatus, the hydrodynamic conditions of the flow have a direct effect on the film thickness and on the residence time of the molecules and thus on the effectiveness of mass and heat transfer. Measurements of the residence time distribution (RTD), for different stirring velocities, allowed to propose a model for the flow as a serie...

Commercial sunflower oil was epoxidized and used as organic costabiliser for rigid poly (vinyl chloride) (PVC) containing zinc and calcium stearates as primary stabilisers and stearic acid as lubricant. For applications in the packaging of foodstuffs, migration testing must be realised. For that purpose, two food simulants were used (sunflower oil...

In order to evaluate the adsorptive capacities of granular activated carbon produced from coffee grounds by chemical activation, the adsorption of different phenols and acid and basic dyes, has been carried out. The comparison with a commercial activated carbon has been made. Adsorption isotherms of phenols and dyes (acid and basic) onto produced a...

Sunflower oil was epoxidized and characterized. Epoxidized sunflower oil (ESO) was used as an organic thermal co-stabilizer for plasticized polyvinyl chloride (PVC) in the presence of Zn and Ca stearates. The thermo-oxidative degradation of PVC was studied in the presence of this ternary stabilizer system at 170 °C. The rates of dehydrochlorination...

The aim of this work is to study the structure-properties relationship of rigid and plasticized PVC/PMMA blends. For that purpose, blends of variable compositions were prepared in the absence and in the presence of a plasticizer di (ethyl-2 hexyl) phtalate or DEHP. The miscibility of the two polymers was investigated by differential scanning calori...

Cet article presente une etude complementaire sur la miscibilite des melanges PVC-PMMA. Dans un precedent article, nous avons trouve que les melanges obtenus par coprecipitation des deux polymeres sont miscibles jusqu'a un taux de 60 % de PMMA. Cette miscibilite est due a une interaction specifique du type liaison hydrogene entre les groupes carbon...

Unsaturated triglyceride oil (sunflower) was obtained from commercial sources. It was epoxidized and characterized by chemical and spectroscopic methods. The thermo-oxidative degradation of poly(vinyl chloride) at 180 °C was investigated. The effects of different metal carboxylate combinations (Ba/Cd and Ca/Zn stearates) in the presence of epoxidiz...

Analysis of Structure-Properties Relationship of PVC-PMMA Blends. This paper presents a study of the structure-properties relationship of PVC-PMMA blends. For that purpose, blends of variable compositions from 0 to 100 wt % were prepared. Their physico-chemical characterization was carried out by differential scanning calorimetric analysis (DSC) an...

The thermal degradation of poly(vinyl chloride) (PVC) has been carried out in trichlorobenzene solution at around 190°C in the presence of zinc and calcium stearates, stearylbenzyl β-diketone and 1–4 dihydropyridine diester derivative (DHP), under argon or in air.No synergistic effect between the two organic compounds is observed under argon, where...

1,4-Dihydropyridine diester derivative (DHP) has been used in the stabilisation of PVC carried out in trichlorobenzene (TCB) at 187°C in the absence and in the presence of zinc and calcium stearates. The kinetics of HCl evolution as well as of chloride ion formation on consumption of the metal soaps were studied by coulometry. DHP, used alone, can...

Careful FTIR analysis of PVC samples heated in trichlorobenzene solution at 187C in the prsence of mixture of zinc and calcium stearates for various times were carried out. A special accessory allowing identical flushing of several samples with dry nitrogen was used. The samples were thoroughly purified before examination. The very weak carbonyl ab...

The thermal degradation of various samples of poly(vinyl chloride) (PVC) in trichlorobenzene (TCB) solution at 187°C has been studied in the presence of a mixture of zinc and calcium stearates. Two series of PVC samples have been studied, both prepared at 55°C using dicetylperoxydicarbonate as initiator. The first series was prepared in TCB solutio...

The thermal degradation of poly(vinyl chloride) (PVC) in trichlorobenzene (TCB) solution at 187°C has been studied in the presence of various mixtures of zinc and calcium stearates, using coulometric titration of chloride ions, HCl evolution measurements and spectroscopic analysis (FTIR and UV) of the degraded polymer at various times. The substitu...

Thermal degradation of poly(vinylchloride) (PVC) has been carried out in trichlorobenzene (TCB) solution at 187°C in the presence of zinc and calcium stearates and β-diketone compounds (BDCs). BDCs are able to react alone with PVC through C alkylation, but the reaction is strongly enhanced by the metal soap system. In the initial stages of the reac...

High resolution 1H and 13C NMR data were obtained on PVC and PVC reduced with Bu3SnH. The reduction is never complete and CH2Cl groups preferentially remain. It causes almost complete formation of cyclopentane structures from both internal and chain end unsaturation. 1H NMR gives total unsaturation as well as chain end unsaturation except if there...