Real Time X-Ray Scattering Studies on the Evolution of Morphology During Heating of a Shrinkable Polyethylene Film

被引：0
|
作者：
J.C. Viana
Z. Denchev
E.M. Cunha
机构：
[1] University of Minho,Department of Polymer Engineering
[2] University of Minho,Department of Polymer Engineering
[3] FIBOPE Portuguesa – Filmes Biorientados,undefined
[4] SA,undefined
来源：
Mechanics of Time-Dependent Materials | 2004年 / 8卷
关键词：
amorphous network; long period; shrinkable films; simultaneous wide-angle and small-angle X-ray scattering; thermal treatment;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A bi-oriented shrinkable polyethylene film (with free ends) was subjected to a thermal treatment while irradiated by synchrotron X-rays. The experimental set-up allowed the simultaneous acquisition of one-dimensional wide-angle (WAXS) and small-angle X-ray scattered (SAXS) patterns in order to monitor the evolution of the microstructure under a controlled heating ramp (at 10.5 K/min, from 298 until 333 K) followed by an isothermal treatment at 333 K during 400 s. The results show that almost no changes occur in the crystalline phase, the main variations being a substantial reduction of the long period during the heating run. The results are interpreted by the recoil of previously highly stretched amorphous phase (taut-tie molecules). This mechanism is related to a low activation energy of 4.12 kJ/mol.
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页码：225 / 233
页数：8
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