Amar Zerroukhi

Copolymerization reactions of vinylidene cyanide with styrenes carrying a fluorocarbon segment: preliminary studies of their microstructure

In order to prepare piezoelectric copolymers, vinylidene cyanide has been copolymerized with two styrenes bearing a fluorinated chain in the para position of the aromatic nucleus, The microstructure of the resulting copolymers has been studied by 13 C NMR, with decoupling of fluorine and hydrogen. These copolymers are perfectly altemating and for one copolymer, a partial cristallinity is observed, due to the side fluorinated chain.

Copolymers of Cyano Compounds with Captodative Monomers. Studies of Their Microstructures

Abstract Copolymers of vinylidene cyanide, methacrylonitrile, and acrylonitrile with various captodative monomers such as cyanovinyl acetate, methyl α-acetoxyacrylate or methyl 1-(methoxy carbonyl) vinyl carbonate were synthesized by radical copolymerization. The microstructures of these copolymers were studied by means of 13C NMR. The copolymers of vinylidene cyanide are rich in alternating structure, and the copolymers of methacrylonitrile and acrylonitrile are rather statistical than alternating. The measurements of reactivity ratios for three copolymerization reactions, vinylidene cyanide, methacrylonitrile, and acrylonitrile with methyl α-acetoxyacrylate, confirm these conclusions.

Biomimetic potential of some methacrylate-based copolymers: A comparative study

Preparation of new biocompatible materials for bone recovery has consistently gained interest in the last few decades. Special attention was given to polymers that contain negatively charged groups, such as phosphate, carboxyl, and sulfonic groups toward calcification. This present paper work demonstrates that other functional groups present also potential application in bone pathology. New copolymers of 2-hydroxyethyl methacrylate with diallyldimethylammonium chloride (DADMAC), glycidyl methacrylate (GlyMA), methacrylic acid (MAA), 2-methacryloyloxymethyl acetoacetate (MOEAA), 2-methacryloyloxyethyltriethylammonium chloride (MOETAC), and tetrahydrofurfuryl methacrylate (THFMA) were obtained. The copolymers were characterized by FTIR, swelling potential, and they were submitted to in vitro tests for calcification and cytotoxicity evaluation. GlyMA and MOETAC-containing copolymers show promising results for further in vivo mineralization tests, as a potential alternative to the classical bone grafts, in bone tissue engineering.

Microstructure of copolymers of vinylidene cyanide, methacrylonitrile and acrylonitrile with methyl α acetoxyacrylate, a captodative monomer

SummaryCopolymers of vinylidene cyanide (1a) methacrylonitrile (1b) and acrylonitrile (1c) with a captodative monomer, methyl α acetoxyacrylate were synthesized by radical copolymerization and their microstructures were studied by 13C NMR spectroscopy.The copolymer of 1a with methyl α-acetoxyacrylate (2) has mostly an alternating structure but the copolymers of 1b and 1c with 2 are rather statistical. The measurement of their reactivity ratios for these two reactions is in agreement with the proposed structures.

Substituted styrenes–maleic anhydride copolymers—Measurements of the reactivity ratios with high conversions and relations between molecular masses and viscosity

Three substituted styrenes were respectively synthesized by reaction of benzoic acid, acetic acid, and methanol with vinylbenzylchloride, then copolymerized with maleic anhydride. The measurements of the reactivity ratios of these three copolymerizations were carried out with a method using high conversions of the reactions. The results show a good correlation between a linear alternating structure for one of the copolymers and an alternating and a partially crosslinked structure for the two others. The copolymerizations were also performed with various percentages of initiator, giving similar proportions of incorporated monomers in the resulting products, and a relation between their viscosities and their weight molecular masses was presented.

Thermal degradation of two copolymers of vinylidene cyanide and methyl α acetoxyacrylate. Thermogravimetric and gas chromatography-mass spectrometry studies

Abstract The thermal behaviour of two copolymers of poly(vinylidene cyanide-co-methyl α acetoxyacrylate) has been studied by means of dynamic and isothermal thermogravimetric analysis in the range 246–316 °C, and gas chromatography-mass spectrometry. The main volatile product is acetic acid, which indicates that the thermal degradation is mainly an elimination reaction. A kinetic model described by a kinetic law of order 1 for the copolymer P(VCN-co-MAA)25 leads to good agreement between experimental and theoretical curves. Kinetic parameters have been calculated. The activation energy is 170.7 kJ mol −1 . For the copolymer P(VCN-co-MAA)50, the depolymerization process is more important while the elimination is still present. No kinetic model can be proposed for this case.