PET/PE原位微纤化共混物的非等温结晶

NON-ISOTHERMAL CRYSTALLIZATION OF POLYETHYLENE TEREPHTHALATE/POLYETHYLENE IN-SITU MICROFIBRILLAR REINFORCED BLENDS

通过挤出、热拉伸及淬冷制备了聚对苯二甲酸乙二醇酯(PET)/聚乙烯(PE)原位微纤化共混物。采用差示扫描量热仪(DSC)研究了PET/PE原位微纤化共混物的非等这结晶特性,为了比较,同时考察了纯PE和PET/PE通常共混物的结晶特性。结果表明,PET微纤对PE有良好结晶异相成核作用,可提高结晶温度、缩短结晶时间、增大结晶速率,但使PE的结晶度和熔点降低;增加降温速率,结晶峰变宽且向低温方向移动。

Polyethylene terephthalate （PET）/polyethylene （PE） in-situ microfibrillar reinforced blend was prepared through a slit extrusion, hot stretch and quenching process. The nonisothermal crystallization kinetics of the in-situ microfiber reinforced blend as well as neat PE and PET/PE common blend were investigated by using differential scanning calorimeter （DSC）. Results indicate： PET microfibers have considerable heterogeneous crystallization nucleation for PE, i.e. , increasing crystallization temperature of PE, lessening crystallization time and increasing crystallizing rate, but decreasing crystallinity and melting temperature of PE a little. The increase of cooling rate made the crystallization peaks of the materials become wider and move toward lower temperature.