THE EFFECT OF PRESSURE ON THERMOPHYSICAL CHARACTERISTICS OF POLY[BIS(TRIFLUOROETHOXY)PHOSPHAZENE]

被引：0
|
作者：
DREVAL, VE [1 ]
FRENKIN, EI [1 ]
TUR, DR [1 ]
KULICHIKHIN, VG [1 ]
机构：
[1] RUSSIAN ACAD SCI,AN NESMEYANOV ORGANOELEMENT CPDS INST,MOSCOW 117813,RUSSIA
来源：
VYSOKOMOLEKULYARNYE SOEDINENIYA SERIYA A & SERIYA B | 1995年 / 37卷 / 02期
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D O I：
暂无
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 phase transitions and thermophysical characteristics of poly[bis(trifluoroethoxy)phosphazene] were studied by dilatometry. An increase in temperature T of transition from crystalline state of the polymer to mesophase and substantial increase in the temperature range of mesomorphic state under elevated pressure was observed. The enthalpy and entropy of the transition decrease when the pressure increases. In the transition from crystalline to mesomorphic state, the thermal expansion coefficient and compressibility experience increases. High pressure causes a decrease in thermal expansion and compressibility of mesophase and brings those to the values comparable to the characteristics of crystalline polymer. It is shown that at low pressures the thermal expansion and compressibility of polymer mesophase are close to those of polyethylene melt.
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页码：248 / 255
页数：8
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