IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*

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IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*

Papers | Updated：2021-06-21

- IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*
- IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*
- 高分子科学（英文版） 2002年20卷第5期页码：473-480
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- 纸质出版：2002-10-20
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IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*[J]. 高分子科学（英文版）, 2002,20(5):473-480.

IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*[J]. 2002, 20(5): 473-480.
IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*[J]. 高分子科学（英文版）, 2002,20(5):473-480. DOI：

IMPACT PROPERTIES OF METALLOCENE - CATALYZED ETHYLENE-α-OLEFIN COPOLYMERS*[J]. 2002, 20(5): 473-480. DOI：

摘要

The impact properties of two selected metallocene-catalyzed ethylene-butene copolymers and one conventionalcopolymer were evaluated using Izod impact test. It is found that the metallocene-catalyzed copolymer shows superior impactproperties. This result was explained on the basis of the more homogeneous inter-molecular composition distribution andnarrower molecular weight distribution

which leads to more homogeneous morphology with fewer defects. Stepwise crystallization improves the impact properties

especially in the crack propagation process

to a large extent.This is due to the decrease of entanglements by stepwise crystallization

which is advantageous for the chain slip and shear.The polymer with heterogeneous intra-molecular composition distribution exhibits a more evident improvement of impact properties under stepwise crystallization.

Abstract

which leads to more homogeneous morphology with fewer defects. Stepwise crystallization improves the impact properties

especially in the crack propagation process

to a large extent.This is due to the decrease of entanglements by stepwise crystallization

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