EQUILIBRIUM TRIPLE POINT PRESSURE AND PRESSURE TEMPERATURE PHASE-DIAGRAM OF POLYETHYLENE

被引：45

作者：

HIKOSAKA, M ^{[1
]}

TSUKIJIMA, K ^{[1
]}

RASTOGI, S ^{[1
]}

KELLER, A ^{[1
]}

机构：

[1] UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND

来源：

POLYMER | 1992年 / 33卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

X-RAY; POLARIZING OPTICAL MICROSCOPY; EXTENDED CHAIN SINGLE CRYSTALS; EQUILIBRIUM MELTING TEMPERATURE; EQUILIBRIUM TRIPLE POINT; P-T PHASE DIAGRAM;

D O I：

10.1016/0032-3861(92)91130-T

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 equilibrium triple point and pressure and temperature phase diagram of polyethylene were obtained by in situ optical microscopic and X-ray observations of the melting temperature of hexagonal and orthorhombic isolated extended chain single crystals at high pressure. The melting temperatures of extended chain crystals still showed a DELTA-T dependence at high pressure, which has been neglected in previous studies. The triple point pressure and temperature were 0.5 x 10(8)-1.5 x 10(8) Pa and 20-30-degrees-C higher than those previously obtained by the d.t.a. method. These results suggest that lamellar thickness dependence is important even in extended chain crystals to obtain equilibrium thermodynamic physical quantities of polymers.

引用

页码：2502 / 2507

页数：6

共 26 条

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