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OALib Journal期刊
ISSN: 2333-9721
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在高压CO2中聚乙二醇-聚己内酯嵌段共聚物的结晶行为
DOI: 10.11777/j.issn1000-3304.2015.14247, PP. 284-289
Keywords: PEO-b-PCL,熔融,高压,CO2,结晶动力学
Abstract:
通过广角X射线衍射(WAXD)和小角X射线散射(SAXS)方法研究了PEO-b-PCL在CO2中的结晶形貌和片晶厚度的变化,利用高压示差扫描量热仪(HPDSC)考察了压力对熔融和等温结晶过程的影响.结果表明,PEO-b-PCL的结晶度、片晶厚度、熔融温度均随压力的升高而减小,结晶结构变得不完善.在等温结晶过程中,结晶速率随压力的升高而下降,结晶过程处于成核控制区,Avrami指数n在3.7~4.7,表明晶体的生长方式为三维生长.
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