NMR investigation of phase transitions in polyethylene in the vicinity of the hexagonal high pressure phase

被引：11
|
作者：
de Langen, M [1 ]
Prins, KO [1 ]
机构：
[1] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands
来源：
POLYMER | 2000年 / 41卷 / 03期
关键词：
polyethylene; phase transitions; NMR;
D O I：
10.1016/S0032-3861(99)00248-7
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The location of the hexagonal crystalline phase of polyethylene in a pT-diagram, occurring at high pressure and high temperature, was determined from proton-NMR spin-lattice relaxation rates and found to be in good agreement with the results obtained with other techniques. Hexagonal and orthorhombic crystalline components as well as the amorphous part in a sample at high pressure can clearly be distinguished by deuteron NMR spectra. The changes in these components were followed as a function of temperature at various pressure values, showing the coexistence of orthorhombic and hexagonal crystalline materials during crystallization. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1175 / 1182
页数：8
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