SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL SCHIFF BASE LIQUID CRYSTALLINE POLYMER CROWN ETHERS

LI Zifa; Guo Kai; ZHANG Xiaojing; ZHANG Teng; ZHENG Shijun; ZHANG Shuyuan; ZHOU Qifeng; LI Lei

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SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL SCHIFF BASE LIQUID CRYSTALLINE POLYMER CROWN ETHERS

Research Article | 更新时间：2021-03-19

- SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL SCHIFF BASE LIQUID CRYSTALLINE POLYMER CROWN ETHERS
- Acta Polymerica Sinica Issue 2, Pages: 175-179(2003)
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- Published：20 April 2003，
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LI Zifa, Guo Kai, ZHANG Xiaojing, ZHANG Teng, ZHENG Shijun, ZHANG Shuyuan, ZHOU Qifeng, LI Lei. SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL SCHIFF BASE LIQUID CRYSTALLINE POLYMER CROWN ETHERS. [J]. Acta Polymerica Sinica (2):175-179(2003)
DOI：

LI Zifa, Guo Kai, ZHANG Xiaojing, ZHANG Teng, ZHENG Shijun, ZHANG Shuyuan, ZHOU Qifeng, LI Lei. SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL SCHIFF BASE LIQUID CRYSTALLINE POLYMER CROWN ETHERS. [J]. Acta Polymerica Sinica (2):175-179(2003) DOI：

摘要

以 4

4′-(α

ω-烷亚甲基二酰氧 )二苯甲醛和二氨基二苯并-15-冠-5为单体

采用溶液缩聚方法

合成了一类新的席夫碱型液晶高分子冠醚 .一种单体采用脂族二酰氯和对羟基苯甲醛反应制备

另一种新的单体采用二硝基二苯并-15-冠-5

在钯碳催化剂存在下

水合肼还原制备 .合成的二硝基和二氨基二苯并-15-冠-5

未能从IR和1H-NMR谱图上区分它们的几何异构体 .聚合物的分子量不高

Mn 在10100～13000之间 .单体的结构通过元素分析、IR、1H-NMR和MS等方法确证 .聚合物的性质采用GPC、DSC、TG和POM等方法进行了研究 .发现所有的聚合物加热到各自的熔融温度 (Tm)以上都能形成液晶态

在液晶态可以观察到向列相的丝状织构和纹影织构 .聚合物的玻璃化转变温度 (Tg)、熔融温度和各向同性温度(Ti)随聚合物分子中柔性间隔基的变化而变化

它们有较高的清亮点温度和宽的液晶态温度范围 .WAXD的研究进一步证实了聚合物的液晶性.

Abstract

A novel series of Schiff base type polymer liquid crystalline crown ethers was synthesized for the first time by solution polycondensation from 4

4′-(alkylene dioyloxy) dibenzaldyhyde (M1) and diamino-dibenzo-15-crown-5 (M2) as the monomers．Monomer M1 has been synthesized by esterification reaction of aliphatdiyl chloride and 4-hydroxybenzaldehyde. Monomer M2 has been synthesized by reduction reaction of dinitrodibenzo-15-crown-5 in the presence 10％ Pd／C catalyst and hydrazine hydrate．The geometric isomers of dinitrodibenzo-15-crown-5 and diaminodibenzo-15-crown-5 that were synthesized for the first time can not be differentiated by IR spectrum and 1H-NMR spectrum．The molecular weights of the polymers are not high

and the Mn of the polymers ranges from 10100～13000．The monomer structures were identified by using elementary analysis

1H-NMR and MS etc．The properties of polymers were investigated by using GPC

DSC

WAXD and POM．It was found that all the polymers went into a liquid crystal phase when heated to their melting temperature (Tm)．The threaded texture and schlieren texture can be observed．The glass transition temperature (Tg)

melting temperature and isotropization temperature (Ti) change with varing the flexible spacer unit in the polymers

all the polymers have higher clearning points and wide mesophase ranges．The WAXD study illustrated that the polymers of 6Ⅰa

6Ⅰc

6Ⅱb and 6Ⅱd are liquid crystalline with a nematic phase．A dispersive peak at 2θ near 20。appeared on their WAXD curves

which is a typical character for quenched nematic liquid crystal polymers．

关键词

席夫碱液晶高分子冠醚合成与表征

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