Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (3): 530-536.doi: 10.1007/s40242-019-8334-z

• Articles • Previous Articles     Next Articles

Highly Soluble Phenylethynyl-terminated Imide Oligomers and Thermosetting Polyimides Based on 2,2',3,3'-Biphenyltetracarboxylic Dianhydride

MENG Xiangsheng1,2, LU Gewu3, LIU Xiuju4, MENG Qingjie3, SHI Junwei3, YUAN Hang3, KE Hongjun3, WANG Xianwei1, FAN Weifeng1, LIU Jingfeng1, YAN Jingling1,2, WANG Zhen1   

  1. 1. Laboratory of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China;
    3. Aerospace Research Institute of Special Materials and Technology, Beijing 100076, P. R. China;
    4. Shandong Non-metallic Materials Institute, Jinan 250031, P. R. China
  • Received:2018-10-19 Revised:2019-01-31 Online:2019-06-01 Published:2019-03-27
  • Contact: FAN Weifeng E-mail:fwf@ciac.ac.cn
  • Supported by:
    Supported by the Technology Innovation Fund of Chinese Academy of Sciences(No.CXJJ-17-M159) and the National Natural Science Foundation of China(No.51473157).

Abstract: The properties of a series of imide oligomers were characterized according to their molecular weights, solubility, and thermal and rheological properties. This series of imide oligomers was synthesized via a two-step method using 2,2',3,3'-biphenyltetracarboxylic dianhydride(3,3'-BPDA) and aromatic diamines as the monomers, and 4-phenylethynyl phthalic anhydride(PEPA) as the end-capping agent. The imide oligomers based on 3,3'-BPDA showed excellent solubility in low boiling point solvents and low melt viscosity, which were attributed to their unique bent architectures. High-performance thermosetting polyimides were produced from these oligomers via thermal crosslinking of the phenylethynyl groups. The mechanical and thermal properties of the thermosets were studied using tensile testing, dynamic mechanical thermal analysis(DMTA), and thermogravimetric analysis(TGA). The 3,3'-BPDA-based thermosets exhibited excellent thermal properties, with glass transition temperatures of up to 455℃, and 5% mass loss temperatures of up to 569℃ in air. The thermosets based on 3,3'-BPDA showed superior thermal properties compared to those derived from TriA-X series oligomers.

Key words: 2,2',3,3'-Biphenyltetracarboxylic dianhydride, Phenylethynyl-terminated imide oligomer, Solubility, Processability, Thermosetting polyimide