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 (T g ) 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 ( 1 H NMR).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.