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Synthesis of polyimides with lower H 2 O‐absorption and higher thermal properties by incorporation of intramolecular H‐bonding
Author(s) -
Qian Guangtao,
Chen Haiquan,
Song Guangliang,
Yao Jianan,
Hu Mengjie,
Chen Chunhai
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190233
Subject(s) - intramolecular force , hydrogen bond , benzimidazole , imide , glass transition , materials science , fourier transform infrared spectroscopy , thermal expansion , polyimide , absorption (acoustics) , polymer chemistry , attenuation coefficient , chemistry , polymer , chemical engineering , organic chemistry , nanotechnology , molecule , composite material , optics , physics , layer (electronics) , engineering
To introduce intramolecular hydrogen bonds in the polyimides (PIs), 5(6)‐amino‐2‐(5‐aminopyridin‐2‐yl)‐benzimidazole (PyPABZ) were designed and synthesized. The intramolecular interaction was indicated by Fourier transform infrared when different copolyimides were prepared with 4,4′‐oxydianiline and PyPABZ. These modified poly(benzimidazole imide)s eliminate the problem of high water absorption for benzimidazole (BI)‐containing PIs in the materials applications. Moreover, the high packing coefficient and rigidity of these copolyimides caused by the strong intramolecular interaction from the H‐bonding and the resulting PIs exhibited outstanding thermal properties such as high glass‐transition temperature ( T g ) and low coefficient of thermal expansion.