GLASS-TRANSITION OF ATACTIC POLYSTYRENE WITH LESS CHAIN ENTANGLEMENTS

被引：10

作者：

DAI, Q ^{[1
]}

LU, Y ^{[1
]}

XUE, G ^{[1
]}

LIAO, YT ^{[1
]}

机构：

[1] NATL TAIWAN INST TECHNOL,DEPT TEXT ENGN,TAIPEI 10772,TAIWAN

来源：

POLYMER BULLETIN | 1995年 / 35卷 / 1-2期

关键词：

D O I：

10.1007/BF00312916

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Atactic polystyrene was dissolved and refluxed in benzene keeping the polymer concentration well below the critical concentration C* value for chain overlap. After rapid freezing of the solution by injecting it directly into liquid nitrogen, the solvent was sublimated so that the expanded chain coils with few entanglements could be obtained. T-g for this material was found to be 11 K lower than the normal polystyrene even after annealing up to 470 K. Comparison of the infrared spectra shows some conformational differences between the freeze-dried and the normal PS. Upon shock-cooling and subsequent freeze- drying, all vibrational bands appear much sharper, indicating an increase in structure regularity.

引用

页码：209 / 214

页数：6