雙酚A系液晶共聚酯之合成與性質研究

Synthesis and Properties of Bisphenol A-Based Liquid Crystalline Copolyesters

蔡宏斌(Hong-Bing Tsai) ； 李大剛(Da-Kong Lee) ； 蔡瑞禧(Ruey-Shi Tsai)

《宜蘭技術學報》 9期 (2002/12) Pp. 43-50

https://doi.org/10.6179/nit.2002.09.15

摘要

本研究以熔融聚縮合法將對乙醯氧基苯甲酸，間苯二甲酸與雙酚A二醋酸酯及/或對苯撐二醋酸酯製得兩系列的共聚酯。其一為對羥基苯甲酸，間苯二甲酸與雙酚A的共聚酯（HBA/IPA/BPA系列）。另一系列為對羥基苯甲酸，間苯二甲酸，氫（醌）與雙酚A的共聚酯（HBA/IPA/HQ/BPA系列）。所得共聚酯測其固有黏度，並以IR分析研究其化學結構。利用DSC及X-射線繞射儀測定共聚酯的熱轉變溫度及結晶性質。共聚醋的液晶性質則以DSC及X-射線繞射儀及偏光顯微鏡分析研究之。組成對HBNIPNBPA系列共聚醋的性質有很大的影響。雙酚A單位的引入大幅降低HBNIPNBPA系列共聚醋的結晶度，且明顯破壞了其液晶性質。HBNIPNHQIBPA系列共聚酯的性質亦受雙酚A單位含量的影響，雙酚A單位迅速破壞其結晶性，並逐漸破壞其液晶行為。另外，HBNIPNHQIBPA系列共聚酯的玻璃轉變溫度隨著雙酚A單位含量的增加而提高。

關鍵字

共聚酯 ； 熔融聚縮合 ； 熱性質 ； 液晶性質 ； 向列

並列摘要

Two series of copolyesters have been prepared by melt polycondensation of p-acetoxybenzoic acid, isophthalic acid, bisphenol A diacetate andlor p-phenylene diacetate. The first is a series of copolyesters of p-hydroxybenzoic acid, isophthalic acid and bisphenol A(HBA/IPA/BPA series), and the second is a series of copolyesters of p-hydroxybenzoic acid, isophthalic acid, hydroquinone and bisphenol A(HBA/IPA/HQ/BPA series). The inherent viscosity of the copolyesters is measured and the chemical structure of the copolyesters is investigated by IR. Their thennal transitions and crystalline properties are determined by DSC and X-ray diffraction. The liquid crystalline properties of the copolyesters are investigated by DSC, X-ray diffraction and polarized microscope. The composition affects the properties of the HBNIPNBPA series of copolyesters significantly. The incorporation of the bisphenol A unit largely decreases the crystallinity of the HBA/IPA/BPA series of copolyesters, and obviously destroys their liquid crytallinity. The content of the bisphenol A unit also affects the properties of the HBA/IPA/HQ/BPA series of copolyesters, the bisphenol A unit destroys their crytallinity rapidly, and gradually destroys their Iiquid crytallinity. In addition, the glass transition temperature of the HBA/IPA/HQ/BPA series of copolyesters increases as the content ofthe bisphenol A unit increases.

並列關鍵字

Copolyesters ； Melt polycondensation ； Thermal properties ； Liquid crystallinity ； Nematic