Synthesis and thermal properties of liquid‐crystalline polyacrylates containing a carbazolyl group in the mesogen
Synthesis and thermal properties of liquid‐crystalline polyacrylates containing a carbazolyl group in the mesogen
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介晶中含有咔唑基的液晶聚丙烯酸酯的合成及热性能
DOI：
10.1002/pola.1994.080320409
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
T. Uryu
中科院分区：
文献类型：
--
作者：
Yozo Kosakasup;Takashi Kato;T. Uryu
合成了新型丙烯酸酯单体4-(ω-丙烯酰氧基烷氧基)-N-(9-甲基-2-咔唑基亚甲基)苯胺，其烷基中含有2至11个亚甲基单元，介晶单元中含有咔唑基，并以偶氮二异丁腈(AIBN)作为自由基引发剂和低能电子束(EB)引发进行聚合。使用差示扫描量热法和热光偏振显微镜检查所得聚合物的热性能。由具有六亚甲基间隔基的AIBN制备的聚合物在73至170℃表现出向列相，而具有十一亚甲基间隔基的聚合物在55至202℃表现出近晶相。聚丙烯酸酯的各向同性温度随着亚甲基间隔基碳数的增加而增加。所得聚合物的产率因EB照射温度而从4.5％变为41％。当单体在液晶相中聚合时获得最高产率。在所得聚合物的分子量中观察到相同的趋势。 © 1994 约翰威利父子公司。
The new acrylate monomers 4-(ω-acryloyloxyalkyloxy)-N-(9-methyl-2-carbazolylmethylene) anilines containing from 2 to 11 methylenic units in their alkyl group and a carbazolyl group in the mesogenic unit were synthesized and polymerized by azobisisobutyronitrile (AIBN) as radical initiator and by low-energy electron beam (EB) initiation. The thermal properties of the resulting polymers were examined using differential scanning calorimetry and thermal optical polarizing microscopy. The polymer prepared by AIBN with a hexamethylene spacer exhibited a nematic phase from 73 to 170°C and with an undecamethylene spacer exhibited a smectic phase from 55 to 202°C. The isotropization temperature of the polyacrylates increased with increasing the number of carbons of the methylenic spacer. The yield of the resulting polymer was changed by EB irradiation temperature from 4.5 to 41%. The highest yield was obtained when the monomer was polymerized in a liquid-crystalline phase. The same tendency was observed in the molecular weight of the resulting polymers. © 1994 John Wiley & Sons, Inc.