聚醚酯/蒙脱土复合材料的结晶动力学和结晶形态

有机－无机复合材料是近来材料科学发展的热点，无机物对基体的结晶行为有很大的影响［１，２］．聚醚酯嵌段共聚物的高弹性依靠硬段结晶形成的物理交联点［３，４］，因而任何影响结晶的因素必然导致其性能的变化．通过聚醚酯与蒙脱土的复合，研究聚醚酯的结晶行为的变化...

Crystallization Kinetics and Morphology of Poly(ether ester)/Montmorillonite Composite

Poly(ether ester)/montmorillonite} composites were prepared by transesterification polycondenzation based on dimethyl terephthlate, ethylene glycol, poly(ethylene glycol) (%M%-n={2 000}) and Na|montmorillonite treated by cation exchange and surface modification. Their crystallization behavior and morphologies, in comparison with pure poly(ether ester), were studied by depolarized light intensity, DSC, polarizing optical micrograph, and SALS. When crystallization temperature %T%-c was higher than 473 K and the montmorillonite content was less than 1%, the montmorillonite obviously increased crystallization rate of poly(ether ester), but the difference between them did not become apparent as %T%-c below 473 K. DSC cooling scanning curves showed that the peak temperature of the composite shifted to a higher temperature. By using CHCl-3 to get phase separation, poly(ether ester) and its composite showed spherulites and dendrites when %T%-c<473 K, but when %T%-c>473 K, both of them showed four|leaf|clover pattern. According to the experimental results we conclude that montmorillonite plays a role of nucleating agent in the matrix, but at the same time there is an interaction between {poly(ether ester)} and montmorillonite, which restricts the movement of chain segment and becomes more notable when %T%-c is lower and the content of montmorillonite is higher.