화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.20, No.1, 10-20, January, 2012
DOI10.1007/s13233-012-0007-4  Export Citation
Studies on Organosoluble Polyimides Based on a Series of New Asymmetric and Symmetric Dianhydrides: Structure/Solubility and Thermal Property Relationships
Ke Zeng, Qiao Guo1, Shuai Gao1, Dimeng Wu1, Haojun Fan†, and Gang Yang1, †
  • The Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu, 610065, P. R. China
  • 1State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, P. R. China, Korea
E-mail:,
A series of new asymmetric biphenyl dianhydrides, 2-phenoxy(o-methylphenoxy, m- methylphenoxy, and p-methylphenoxy)-4,4,5,5-biphenyltetracarboxylic dianhydrides, was readily synthesized using a five-step route. A new symmetric biphenyl dianhydride, 2,2-di(o-methylphenoxy)-4,4,5,5-biphenyltetracarboxylic dianhydride, was also synthesized using the similar procedure. The polyimides were prepared from such new dianhydrides and commercial diamines by high-temperature one-step polymerization. The asymmetric and symmetric substituent solubility and thermal property relationships of the resulting polyimides were investigated. Interestingly, the thermally reversible sol.gel transitions were observed for the polymer solutions of the polyimides derived from those asymmetric dianhydrides and 1,4-phenylenediamine (p-PDA). Unexpectedly, the polyimides derived from asymmetric dianhydrides did not show better organosolubility than those of the homologous polyimides derived from symmetric dianhydrides. The structures of the substituents (phenoxy, o-methylphenoxy, m-methylphenoxy and p-methylphenoxy) have a significant effect on both the solubility and the thermal properties of these polyimides. The polyimides derived from asymmetric dianhydrides show enhanced thermal properties relative to the symmetric dianhydridesderived polyimides. These results can be attributed to their different degrees of molecular packing revealed by wideangle X-ray diffraction measurements.
Keywords:polyimide;asymmetric dianhydride;symmetric dianhydride;organosolubility;thermal properties;structure/property relationship.
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