The occurrence of the gamma-phase in injection moulded polypropylene in relation to the processing conditions

被引：78
|
作者：
Kalay, G [1 ]
Zhong, ZP [1 ]
Allan, P [1 ]
Bevis, MJ [1 ]
机构：
[1] BRUNEL UNIV,DEPT MAT ENGN,WOLFSON CTR MAT PROC,UXBRIDGE UB8 3PH,MIDDX,ENGLAND
来源：
POLYMER | 1996年 / 37卷 / 11期
关键词：
polypropylene; gamma-phase; molecular orientation;
D O I：
10.1016/0032-3861(96)85852-6
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Wide-angle X-ray diffraction has been used to characterize different grades of conventionally injection moulded and shear-controlled-orientation injection moulded isotactic polypropylene. The occurrence of the gamma-phase in injection mouldings was discussed in particular. A newly defined gamma-phase index is used as a criterion for the characterization of mouldings. The gamma-phase was shown to be associated with pronounced molecular orientation while the beta-phase is indicative of low modulus. Shear-controlled-orientation injection moulding (SCORIM) provided for a good control on the final properties of the mouldings. Copyright (C) 1996 Elsevier Science Ltd.
引用
收藏
页码：2077 / 2085
页数：9
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