Thermal decomposition kinetics of thermotropic liquid crystalline polyesterimides |
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| Authors: | Zhenguo Chi Xiandong Yao Yi Zhang Jiarui Xu |
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| Affiliation: | 1. Department of Material Sciences, Fudan University, Shanghai 200433, China;2. Institute of Applied Chemistry, Shaoxing College of Arts and Science, Shaoxing 312000, Zhejiang, China;3. Institute of Material Sciences, Sun Yat-sen (Zhongshan) University, Guangzhou 518057, China |
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| Abstract: | We investigated the thermal decomposition behavior of three groups of polyesterimides that had been synthesized from different compositions of monomers that were added in different. We characterized these polymers with thermogravimetric analysis (TGA) and calculated the apparent activation energy (Ea) associated with the thermal decomposition process by the Ozawa method. The results showed that the Ea of the polyesterimides was correlated with the length of the methylene spacer and the content of the 4,4′‐dihydroxybenzophenone monomer. The polyesterimide with four methylene spacers in the main chain had a higher Ea than that with six methylene spacers. The polyesterimide with a higher 4,4′‐dihydroxybenzophenone content provided better thermal stability. The Ea of the polyesterimides also depended on the sequence in which the monomers were added during the copolycondensation process. The Ea of these polyesterimides followed the order: p‐hydroxybenzoic acid added first > p‐hydroxybenzoic acid mixed 4,4′‐dihydroxybenzophenone adding > 4,4′‐dihydroxybenzophenone added first. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2467–2472, 2005 |
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| Keywords: | liquid‐crystalline polymers thermogravimetric analysis copolymerization polyestermide adding monomer sequence |
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