交替层状PP/PPCB中β晶的形成及机理  

Formation and Mechanism of β Crystals in PP /PPCB Alternating Multilayered Composites

作　　者：陈凡[1] 李姜[1] 郭少云[1] 

机构地区：[1]四川大学高分子研究所,高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2013年第9期107-109,113,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51227802;50933004;51121001;51073099);教育部优先资助领域项目(20110181130004);教育部新世纪优秀人才支持计划(NCET-10-0593);四川省青年基金(2012JQ0033)

摘　　要：利用多层共挤出设备制备了不同层数的聚丙烯(PP)/聚丙烯+炭黑(PPCB)交替多层材料,利用偏光显微镜和差示扫描量热仪探索了PP/PPCB多层复合材料中β晶的形成和机理。实验结果表明:将多层样品在130℃进行等温结晶后,PP层形成了扇形β晶,成核点位于PP层和PPCB层的界面处。β晶的结晶度与PP层的厚度有关,形成机理与界面处的应力集中有关。当应力集中被消除后不再产生β晶。Alternating multilayered polypropylene （PP）/polypropylene ＋ carbon black （PPCB） composites with different number of layers were fabricated by the multilayered coextrusion technology. The formation and mechanism of β crystals in the alternating multilayered structure were studied by POM and DSC. The results indicate that a lot of fan-shaped β crystals were produced in the PP layers after isothermal crystallization at 130 ℃, and the β-nuclei were located at the interfaces. The contents of β crystals are related to the thickness of PP layers, and the mechanism is associated with the stress concentration. There are no longer any β crystals once the stress concentration is eliminated.

关 键 词：聚丙烯 Β晶 交替层状材料 应力集中 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]