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

被引：79

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

页码：2077 / 2085

页数：9