化工学报2012，Vol.63Issue(4)：1274-1286,13.DOI:10.3969/j.issn.0438-1157.2012.04.039
α/β复合成核剂对等规聚丙烯结晶形态的影响及非等温结晶动力学
Crystallization morphologies and non-isothermal crystallization kinetics of isotactic polypropylene modified by α/β compounded nucleating agents
摘要
Abstract
Crystallization morphologies and non-isothermal crystallization kinetics of isotactic polypropylene (iPP) modified by three a/j3 compounded nucleating agents (Nas) were studied by means of polarized optical microscope (POM) and differential scanning calorimeter (DSC). The size of spherulites in nucleated iPP appeared much smaller than that in pure iPP. However, iPP nucleated by different ratios of a/￡S compounded Nas showed different crystallization morphologies. Crystallization morphologies of nucleated iPP depended on ATCp (ATcP refers to the difference in crystallization peak temperature between nucleated iPP and pure iPP) of a and (3 Nas. The one with the higher ATCp played a leading role in the crystallization process, resulting in that the crystallization morphology of nucleated iPPappeared close to that with the NA alone. Competitive nucleation would occur when the difference of ATCp between two Nas was not pronounced. ATCp was related to the concentration of NA. Thus crystallization morphologies could be adjusted by changing the ratio of a/(3 compounded NA. The Caze method was used to deal with non-isothermal crystallization kinetics obtained by DSC. The obtained parameters showed addition of a/(3 compounded nucleating agents could greatly raise crystallization peak temperature of iPP and shorten the crystallization half-time. Avrami exponent of a/(3 compounded nucleated iPP was close to that of iPP nucleated by the NA with the higher ATCp individually, which demonstrated that the crystallization process of iPP nucleated with a/(3 compounded Nas also depended on ATCp of a and (3 Nas within the compounded system.关键词
等规聚丙烯/成核剂/α/β复合成核剂/结晶形态/非等温结晶动力学Key words
isotactic polypropylene/ nucleating agent/ a/f! Compounded NA/ crystallization morphology/ non-isothermal crystallization kinetics分类
化学化工引用本文复制引用
石尧麒,辛忠..α/β复合成核剂对等规聚丙烯结晶形态的影响及非等温结晶动力学[J].化工学报,2012,63(4):1274-1286,13.基金项目
国家自然科学基金项目(20876042,20806023) （20876042,20806023）
上海市优秀学科带头人计划项目(XD1401500) （XD1401500）
高等学校博士学科专项科研基金项目 （）
中央高校基础研究基金项目. （）
