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Homopolyimides containing both benzimidazole and benzoxazole with high T g and low coefficient of thermal expansion
Author(s) -
Chen Haiquan,
Dai Fengna,
Wang Mengxia,
Chen Chunhai,
Qian Guangtao,
Yu Youhai
Publication year - 2021
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20210156
Subject(s) - benzoxazole , benzimidazole , thermal expansion , glass transition , intermolecular force , hydrogen bond , materials science , substrate (aquarium) , chemistry , polymer , composite material , organic chemistry , molecule , oceanography , geology
A pair of isomer diamines containing both benzimidazole and benzoxazole and derived homopolyimides were synthesized for the first time. Due to rich rigid and linear benzoazole units, as well as the strong intermolecular interactions from the hydrogen bonding and the charge transfer complexation (CTC), the obtained polyimides (PIs) exhibited outstanding thermal properties, including high thermal weight loss temperature ( T d5% = 540–561°C), high glass transition temperature ( T g = 392–421°C), and low coefficient of thermal expansion (CTE = 1.3–20.9 ppm /°C). In addition, the obtained PIs also showed ideal mechanical properties ( T S = 189–240 MPa, T M = 4.1–5.0 GPa and E B = 2.9%–4.7%). These potential novel PI films with high T g and low CTE were expected to be applied to next generation of flexible display substrate material.