A novel synthesis method for the preparation of aromatic poly(imide benzoxazole) from trimellitic anhydride chloride and bis(o-aminophenol)

• Published in: Journal of applied polymer science Vol. 88; no. 10; pp. 2388 - 2391
• Main Authors: Hsu, Steve Lien-Chung, Chang, Keng-Chuan, Huang, Yuan-Pin, Tsai, Shih-Jung
• Format: Journal Article
• Language: English
• Published: New York Wiley Subscription Services, Inc., A Wiley Company 06.06.2003; Wiley
• Subjects: Applied sciences; Exact sciences and technology; high temperature materials; Organic polymers; Physical Sciences; Physicochemistry of polymers; Polycondensation; polyimides; Polymer Science; Preparation, kinetics, thermodynamics, mechanism and catalysts; Science & Technology; synthesis; synthesis; high temperature materials; polyimides; Polyimide; Chemical resistance; Aromatic polymer; Solubility; Experimental study; Glass transition temperature; Amidoacid polymer; Solution polymerization; Thermal stability; Thermal properties; Polybenzoxazole; Imidation; Preparation; Thermodynamic properties
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.11867

A poly(imide benzoxazole) was prepared directly from trimellitic anhydride chloride and 2,2‐bis(3‐amino‐4‐hydroxyphenyl)hexafluoropropane (BisAPAF) monomers in a two‐step method. In the first step, a poly(hydroxyamide amic acid) precursor was synthesized by the low‐temperature solution polymerization in an organic solvent. Subsequently, thermal cyclodehydration of the poly(hydroxyamide amic acid) precursor at 350°C produced the corresponding poly(imide benzoxazole). The inherent viscosity of the precursor polymer was 0.22 dL/g. The cyclized poly(imide benzoxazole) showed a glass transition temperature (Tg) at 329°C and a 5% weight loss temperature at 530°C in nitrogen and at 525°C in air. The poly(imide benzoxazole) is amorphous as evidenced by the wide‐angle X‐ray diffraction measurement. The structures of the precursor polymer and the fully cyclized polymer were characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance spectroscopy (1H NMR). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2388–2391, 2003