Journal of South China University of Technology (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (4): 73-79.doi: 10.12141/j.issn.1000-565X.190724

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Synthesis and Characterization of Quaternary Copolymerized Thermoplastic Polyimide 

CAO Xianwu WEI Chuang HE Guangjian WEN Jiangwei   

  1. Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing∥National Engineering
    Research Center of Novel Equipment for Polymer Processing∥The Key Laboratory of Polymer Processing Engineering of Ministry of Education，South China University of Technology，Guangzhou 510640，Guangdong，China
  • Received:2019-10-17 Revised:2019-12-19 Online:2020-04-25 Published:2020-02-14
  • Contact: 曹贤武(1970-)，男，博士，教授，主要从事高分子材料加工与改性研究。 E-mail:ppeme@scut.edu.cn
  • About author:曹贤武(1970-)，男，博士，教授，主要从事高分子材料加工与改性研究。
  • Supported by:
    Supported by the National Key Ｒesearch and Development Plan (2016YFB0302000)

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Abstract: In order to improve the thermoplasticity of polyimide，a series of novel quaternary copolymerized poly-imide materials were successfully synthesized by two-step method with 1，2，4，5-benzenetetracarboxylic anhydride(PMDA) and 3，3'，4，4'-biphenyltetracarboxylic dianhydride ( s-BPDA) as dianhydride，4，4'-oxydianiline(ODA) and 2，2-bis［4-(4-aminophenoxy)phenyl］propane (BAPP) as diamine． The synergistic effect of rigid bi-phenyl groups with flexible monomers and pendant methyl groups on the properties of polyimide was studied． The molecular structure，thermoplasticity and heat resistance of the polyimides were characterized by FTIＲ，XRD，DMA，TGA and other testing methods． The results show that the series of quaternary copolymerized polyimides have good thermoplasticity and heat resistance． Particularly，when the molar fraction ratio of PMDA ∶ s-BPDA ∶ ODA ∶BAPP is 70 ∶ 30 ∶ 70 ∶ 30，the polyimide exhibits excellent thermoplasticity and heat resistance． What’s more，its good solubility in aprotic polar solvent can greatly improve the processing properties of the polyimide in a solvent or molten state．

Key words: thermoplastic polyimide, quaternary copolymerization, BAPP, heat resistance