摘要
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...
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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期324-326,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
聚醚酯
结晶动力学
蒙脱土
复合材料
Poly(ether ester), Crystallization kinetics, Crystallization morphology, Nucleating agent,
Montmorillonite\