The relationship between the chemical structure and thermal conversion temperatures of thermally rearranged (TR) polymers

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• 作者：Mariola Calle^a ; Yishee Chan^b ; Hye Jin Jo^a ; Young Moo Lee^a ; ^b ; ^{ymlee@hanyang.ac.kr}
• 关键词：Thermal conversion temperature ; Glass transition temperature ; Thermal rearrangement
• 刊名：Polymer
• 出版年：2012
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：7 June, 2012
• 卷：53
• 期：13
• 页码：2783-2791
• 文件大小：1827 K

摘要

An attempt was made to elucidate the relationship between chemical structure, in terms of glass transition temperature (T_g), and conversion temperature (T_TR) of thermally rearranged polybenzoxazole membranes, by analyzing DSC and TGA data for a total of 15 sets of o-hydroxypolyimides and copolyimides, derived from two experimental and four commercial structurally different diamines, as well as four different dianhydride monomers. Our research revealed that T_TR was influenced by chain ridigity of o-hydroxypolyimides, and exhibited a linear relationship with T_g. Therefore, structure and thermal property of o-hydroxypolyimide should be considered when studying TR polymers to determine thermal conversion to polybenzoxazole.