论文部分内容阅读
本文研究了聚乙烯-醋酸乙烯酯(EVA,VAc:14％)与氯乙烯(VC)接枝共聚物(EVA-g-VC)的相结构和分子结构。接枝物EVA-g-VC由游离EVA、均聚PVC和EVA-VC接枝高分子三者组成,EVA呈连续相,PVC呈分散微粒。EVA-g-VC中EVA的含量越高,PVC粒子体积越小。实验结果表明,接枝物中“凝胶”的EVA玻璃化温度,随投料比(VC/EVA)的减小而升高;另外随VC/EVA减小,凝胶中PVC的含量和PVC的分子量也减小。这些结果说明,VC/EVA较小时得到的接枝物中,EVA上VC接枝点的数目较多,而PVC接枝链的长度较短。EVA-VC是不相容两相——EVA和PVC的“粘着剂”,其作用表现在:VC/EVA越小,接枝物中EVA和PVC的玻璃化温度越靠近。
In this paper, the phase structure and molecular structure of polyethylene-vinyl acetate (EVA, VAc: 14%) and vinyl chloride (VC) graft copolymer were studied. Graft EVA-g-VC by the free EVA, homopolymer PVC and EVA-VC grafted polymer composed of three, EVA was continuous phase, PVC dispersed particles. The higher the EVA content in EVA-g-VC, the smaller the PVC particle size. The experimental results showed that the glass transition temperature of the “gel” EVA increased with the decrease of the feed ratio (VC / EVA). In addition, with the decrease of VC / EVA, the content of PVC in the gel and the content of PVC The molecular weight is also reduced. These results indicate that the number of VC grafting points on the EVA is greater for the grafts obtained with a smaller VC / EVA, while the length of the PVC graft chains is shorter. EVA-VC is an incompatible two-phase EVA-PVC “adhesive” that acts as follows: the smaller the VC / EVA, the closer the glass transition temperature of the EVA and PVC in the graft.