聚合物型成核剂对HDPE结晶行为的影响

Effect of Polymeric Nucleating Agent on Crystallization of HDPE

以丙烯酰氯、对羟基苯甲酸和对羟基苯甲醚为原料 ,采用酰化反应制备了一种乙烯基单体 ,并采用自由基聚合反应合成出聚合物型成核剂聚 4 甲氧基 4′ 丙烯酰氧苯甲酸苯酯 (PMAPAB) ;研究了PMAPAB对高密度聚乙烯(HDPE)结晶和熔融行为以及晶体形态的影响 ,并分析了HDPE的非等温结晶行为。结果表明 :该聚合物用量为0 .2 5 %～ 1 .5 %时 ,均能促进HDPE的结晶 ,提高HDPE的结晶速率及结晶度 ,降低其晶粒的尺寸并使其分布更为均匀 ,当PMAPAB用量为 0 .2 5 %时 ,能达到最佳的成核效果。

The vinyl monomer with rigid groups in side chain was prepared from 4-hydroxybenzoic acid, 4-hydroxyanisole and acryloyl chloride by acylation reaction Polymeric nucleating agent PMAPAB was synthesized by means of homopolymerization using BPO as initiator at 60℃ in 1, 4-dioxane The effects of the polymeric nucleating agent on the crystallization, melting behaviour and crystalline morphology of HDPE were studied The results indicated that the polymer could effectively increase the crystallization rate and crystallinity of HDPE, decrease the crystal size of HDPE, and make it disperse more uniformly, and the optimum nucleation could be achieved when the content of PMAPAB was 025%.