A POLYESTER FORMING A THERMOTROPIC CHOLESTERIC PHASE

被引:43
作者
KRIGBAUM, WR [1 ]
CIFERRI, A [1 ]
ASRAR, J [1 ]
TORIUMI, H [1 ]
PRESTON, J [1 ]
机构
[1] MONSANTO TRIANGLE PK DEV CTR INC,RES TRIANGLE PK,NC 27709
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1981年 / 76卷 / 1-2期
关键词
POLYESTERS; -; Measurements;
D O I
10.1080/00268948108074676
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mesomorphic polyesters were synthesized from 4,4 prime -dihydroxy- alpha -methylstilbene and adipic acid (P-6) or ( plus )-3-methul adipic acid (P-6M). P-6 forms a thermotropic nematic phase and P6-M a thermotropic cholesteric phase. The nematic phase of P-6 could easily be identified by optical microscopy. For both polymers, a biphasic region in which the isotropic and liquid crystalline phases coexist was observed. Bright colors were obtained by increasing the pitch of Pg-M by admixture with either a low molecular weight nematogen or with polymer P-6, and also by synthesizing a copolymer containing the two dibasic acids. The copolymeric cholesteric phase, which is stable between 199 and 282 degree C, had a predominately planar texture, and these features could be retained in the solid state by quenching to produce a film having a deep blue color at room temperature. The role of the degree of polymerization upon the development of organization, and parameters, of the mesophase is discussed.
引用
收藏
页码:79 / 91
页数:13
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