EFFECT OF UV IRRADIATION ON THE STRUCTURE OF HETEROPHASIC ETHYLENE-PROPYLENE COPOLYMERS

被引：14
|
作者：
MANI, R [1 ]
SINGH, RP [1 ]
SIVARAM, S [1 ]
LACOSTE, J [1 ]
机构：
[1] UNIV CLERMONT FERRAND,PHOTOCHIM LAB,F-63177 CLERMONT FERRAND,FRANCE
来源：
POLYMER JOURNAL | 1994年 / 26卷 / 10期
关键词：
ETHYLENE PROPYLENE COPOLYMER; CRYSTALLINITY; UV IRRADIATION; INTRINSIC VISCOSITY; DSC; X-RAY DIFFRACTION;
D O I：
10.1295/polymj.26.1132
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Changes in [eta] and crystallinity of commercial samples of isotactic polypropylene (i-PP), heterophasic ethylene-propylene copolymers [E-P copolymer] containing < 16 mol% of ethylene and their fractions (having ethylene content 40.9 and 55. mol%) upon polychromatic irradiation in air at 55-degrees-C were studied by comparing unirradiated samples. Crystallinity was evaluated by DSC and X-ray diffraction. Viscosity results showed a decrease of molecular weight upon irradiation. DSC and X-ray studies revealed that the transition of alpha-modification to beta-phase of polypropylene and also that crystallinity of the copolymer decreased initially upon irradiation. However, upon longer irradiation, the crystallinity increased again.
引用
收藏
页码：1132 / 1141
页数：10
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