Carbon-13 nuclear magnetic resonance studies on the microstructure of the copolymer of vinylidene cyanide and methyl methacrylate

Radical copolymerization of 2,2,2-trifluoroethyl methacrylate with cyano compounds for dielectric materials: Synthesis and characterization

“…In the alternating copolymers of poly(VCN-altmethyl a-acetoxylacrylate) [13,33] and poly(VCN-alt-methyl methacrylate) copolymers [41], the resonance of carbonyl carbon shows three peaks in 0.25:0.50:0.25 ratio arising from the triad sequences centered in methyl a-acetoxylacrylate. The expansion of the C O band in poly(AN-co-MATRIF) copolymer in the range 172-176 ppm shows four multiplets centred at 173, 174, 175 and 175 ppm confirming the statistical structure of this copolymer, as it was observed in poly(AN-comethyl a-acetoxyacrylate) copolymer [19].…”

“…Due to the piezoelectric activity of the amorphous and alternating copolymer of vinylidene cyanide (VCN) and vinyl acetate, first described by Miyata et al [2], there has been growing interest in the copolymerization of cyano monomers with various acrylic, vinylic or styrenic to study their microstructures or their pyroelectric and dielectric properties. Vinylidene cyanide has been copolymerized with comonomers such as vinylic esters [3], styrene [4], substituted styrenes [5] and methacrylic derivatives [6]. All these copolymerizations gave alternating copolymers and their microstructures were characterized by 13 C NMR.…”

Copolymerization of α‐cyanovinyl acetate with acrylonitrile and methacrylonitrile: Synthesis, characterization, and study of their dielectric behavior

“…poly(VCN-alt-methyl methacrylate), 4 the resonance of the carbon atom in cyanide group of MAN showed three broad peaks in 25 %: 50 %: 25% ratio arising from the triad sequences centered in VCN. The nature and the shape of the peaks of the CN of MAN in the poly(MAN-co-CVA) copolymer does not suggest an alternating structure.…”

“…Therefore, studies that include the copolymerization reactions of VCN with various monomers have been of growing relevance in the last few years. VCN copolymerized with methyl methacrylate, 4 isopropenyl acetate, 5 vinyl benzoate, 6 styrene, 4 substituted styrenes, 7 and vinyl esters of fatty acids. 8 All these copolymerizations gave alternating copolymers, and their microstructures were characterized by 13 C NMR spectroscopy.…”

Etude diélectrique de deux copolymères du méthylcyanure de vinylidène avec le 4-fluorostyrène et le 4-chlorostyrène

“…Le cyanure de vinylidène réagit aussi avec un grand nombre de monomères donneurs d'électrons tels que le styrène, [1] le méthacrylate de méthyle [2] et des esters vinyliques [3] pour conduire à des composés piézoélectriques [4] parfaitement alternés. Les travaux fondamentaux concernant les propriétés piézoélectriques de certains copolymères de VCN rendent compte de la mobilité de la chaîne des macromolécules, [5] de leurs propriétés diélectriques, [6,7] et de leurs énergies de relaxation.…”