PET/分子筛原位聚合复合材料的等温结晶性能

Research on isothermal crystallization of PET/molecular sieve composites prepared by in-situ polymerization

采用原位聚合的方法制备了聚对苯二甲酸乙二酯(PET),分子筛复合材料,并通过差示扫描量热仪研究了不同分子筛含量复合材料的等温结晶性能。结果表明：分子筛的加入有明显的异相成核效果,加快了结晶速率,增加了结晶度,减小了晶粒尺寸分布。在210℃的结晶温度下,当分子筛质量分数为4%时,半结晶时间为156s,结晶热焓为37.84J/g,结晶峰半峰宽为1.88s。

Polyethylene terephthalate (PET)/molecular sieve composites were prepared by in-situ polymerization. The isothermal crystallization kinetics of the composites was studied with differential scanning calorimetric measurement.The results indicate that the molecular sieve exerts an obvious heterogeneous nucleating effect on PET,accelerates the crystallization rate,increases the degree of crystallinity and narrow the crystalline size distribution.At the crystallization temperature of 210℃,when molecular sieve content reaches 4%,the half-crystallization time is 156s,crystallization enthalpy 37.84 J/g and half-width of the crystallization peak 1.88s.