Significant Influence of Alkyl Substituents in the Alicyclic Rigid Backbone on Solubility and Thermal Stability of Polyarylamide Copolymers
Significant Influence of Alkyl Substituents in the Alicyclic Rigid Backbone on Solubility and Thermal Stability of Polyarylamide Copolymers
复制标题
脂环族刚性骨架中的烷基取代基对聚芳酰胺共聚物的溶解度和热稳定性的显着影响
DOI：
10.1021/acsapm.1c00168
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发表时间：
2021
影响因子：
5
通讯作者：
Wang Changchun
中科院分区：
文献类型：
--
作者：
Jin Ke;Sun Qiangsheng;Feng Yudi;Guo Jia;Xu Jiangtao;Wang Changchun
Incorporation of alicyclic structural units in a polymer backbone holds great promises for preparing polyarylamides with superior physical properties (solubility, optical transparency, thermal stability, etc.). In this study, the alicyclic-containing building block, tetraethyl-substituted dibenzocyclooctadiene (TE-DBCOD), was integrated into the backbone of polyarylamides through a unique diamine monomer, TE-DBCOD-NH2. The TE-DBCOD-containing polyarylamides were synthesized first through polycondensation with different contents of TE-DBCOD units. Compared to the control polymers without DBCOD or ethyl side-chain units, the polyarylamides with TE-DBCOD units showed better solubility in less polar solvents (m-cresol, pyridine, and tetrahydrofuran) and higher glass transition temperature (Tg), which provides an opportunity to fabricate polyarylamides with both improved solubility andTg. Meanwhile, we also prepared the poly(amide-imide)s with TE-DBCOD by a two-step method for comparison. In contrast, the aromatic poly(amide-imide)s showed better solubility and lowerTgs than the corresponding aromatic poly(amide-imide)s without TE-DBCOD contents, which revealed the complex influence of structure parameters on different polymers. Additionally, the synthesized polymers possessed high thermal stability (5% weight loss temperature > 440 °C) verified by thermogravimetric analysis. The strategy of introducing short side chains in polymer backbones opens a window for exploration of polymers with improved solubility and increasedTgsimultaneously, which also facilitates the understanding of the structure–property relationship of polymers with alicyclic structural units.
