INFLUENCE OF MOLECULAR-WEIGHT ON SOME PROPERTIES OF LIQUID-CRYSTALLINE POLYURETHANES

被引：25
作者：
SZCZEPANIAK, B
FRISCH, KC
PENCZEK, P
RUDNIK, E
CHOLINSKA, M
机构：
[1] IND CHEM RES INST,UL RYDYGIERA 8,PL-01793 WARSAW,POLAND
[2] UNIV DETROIT MERCY,POLYMER TECHNOL INC,DETROIT,MI 48221
来源：
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1993年 / 31卷 / 13期
关键词：
MAIN-CHAIN LIQUID CRYSTALLINE POLYMERS; THERMOTROPIC; POLYURETHANE; MOLECULAR WEIGHT EFFECT;
D O I：
10.1002/pola.1993.080311309
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
This investigation extends our previous investigations of liquid crystalline polyurethanes prepared from 4,4'-bis(2-hydroxyethoxy)biphenyl (BHBP), 2,4-tolylene diisocyanate, and poly(oxytetramethylene)diols as the flexible spacers. The influence of molecular weight of investigated polyurethanes on their properties is discussed for two series with the same content of BHBP and different lengths of flexible spacers. The polyurethanes were investigated by means of DSC, polarizing microscopy, x-rav diffractometry, and IR spectroscopy. The molecular weight distribution was determined by GPC. Morphology was studied by the SALS method. The molecular weight of polyurethanes and the length of flexible spacer influence the phase transition temperature and the range of mesophase occurrence. (C) 1993 John Wiley & Sons, Inc.
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页码：3231 / 3237
页数：7
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