多孔二氧化硅对聚环氧乙烷结晶行为的影响

高分子化合物由于具有很长的分子链，不易进行规整排列，结晶速度通常很慢，为提高结晶速度，有时需要加入成核剂．多孔二氧化硅（ＳｉＯ２）具有较大的比表面积，故吸附作用较强，有可能作为成核剂影响部分结晶高聚物的结晶过程．聚环氧乙烷（ＰＥＯ）为部分结晶高聚物，其结晶行为对杂质较为敏感．本文目的在于通过结晶动力学及结晶与熔融行为的研究，探索多孔二氧化硅对ＰＥＯ结晶行为的影响．１　实验部分　　聚环氧乙烷（ＰＥＯ，Ｍｗ＝１×１０５）．两种多孔二氧化硅（ＳｉＯ２）按文献［１］方法制备，平均粒度为０．３μｍ，平均孔…

Effect of Multihole Silicon Dioxide on Crystallization Behavior of Poly(ethylene oxide)

The effect of multihole silicon dioxide on the melting and crystallization behavior of poly(ethylene oxide) was investigated by means of DSC. It has been found that the melting temperature and enthalpy of poly(ethylene oxide) seem not to be affected by multehole silicon oxide, whereas the temperature of crystallization from melt is increased somewhat and the isothermal crystallization is accelected obviously. The Avrami exponents of poly(ethylene oxide)/silicon dioxide composite approach to that of pure poly(ethylene oxide). This suggests that the crystallization mechanism of poly(ethylene oxide) does not change after blending.