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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Novel Copolymers of Vinyl Acetate and Alkyl Ring-Substituted 2-Phenyl-1,1-dicyanoethylenes
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Novel Copolymers of Vinyl Acetate and Alkyl Ring-Substituted 2-Phenyl-1,1-dicyanoethylenes

机译：乙酸乙烯酯和烷基环取代的2-苯基-1,1-二氰基乙烯的新型共聚物

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摘要

Electrophilic trisubstituted ethylene monomers, alkyl ring-substituted 2-phenyl-1,1-dicyanoethylenes, RC6H4CH=C(CN)2 (where R is 2-methyl, 3-methyl,4-methyl, 4-ethyl, 4-isopropyl, 4-butyl, and 4-t-butyl), were synthesized by piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and malononitrile, and characterized by CHN elemental analysis, IR, 1H- and 13C-NMR. Novel copolymers of the ethylenes and vinyl acetate were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (ABCN) at 70°C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1H and 13C-NMR, GPC, DSC, and TGA. High Tg of the copolymers, in comparison with that of polyvinyl acetate, indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 190-700°C range.
机译：亲电三取代乙烯单体，烷基环取代的2-苯基-1,1-二氰基乙烯，RC6H4CH = C（CN）2（其中R为2-甲基，3-甲基，4-甲基，4-乙基，4-异丙基，通过哌啶催化环取代的苯甲醛和丙二腈的Knoevenagel缩合反应合成4-丁基和4-叔丁基），并通过CHN元素分析，IR，1H-和13C-NMR表征。在自由基引发剂（ABCN）的存在下于70°C通过溶液共聚，以等摩尔单体进料组成制备乙烯和乙酸乙烯酯的新型共聚物。由氮分析计算共聚物的组成，并通过IR，1 H和13 C-NMR，GPC，DSC和TGA分析结构。与三聚乙酸乙烯酯相比，该共聚物的高Tg表明该共聚物的链迁移率显着降低，这是由于三取代的乙烯单体单元的高偶极特性所致。重量分析表明该共聚物在190-700℃范围内分解。

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