Synthesis and characterization of novel aromatic poly(imide-benzoxazole) copolymers

Lien-Chung Hsu, Guo Wei Luo, Hui Tzu Chen, Shih Wei Chuang

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17 Citations (Scopus)

Abstract

New poly(imide-benzoxazole) copolymers were prepared directly from a dianhydride, a diacid chloride, and a bis(o-diaminophenol) monomer in a two-step method. In the first step, poly(amic acid-hydroxyamide) precursors were synthesized by low-temperature solution polymerization in an organic solvent. Subsequently, the thermal cyclodehydration of the poly(amic acid-hydroxyamide) precursors at 350 °C produced the corresponding poly(imide-benzoxazole) copolymers. The inherent viscosities of the precursor polymers were around 0.19-0.33 dL/g. The cyclized poly(imide-benzoxazole) copolymers had glass-transition temperatures in the range of 331-377 °C. The 5% weight loss temperatures ranged from 524 to 535 °C in nitrogen and from 500 to 514 °C in air. The poly(imide-benzoxazole) copolymers were amorphous, as evidenced by the wide-angle X-ray diffraction measurements. The structures of the precursor copolymers and the fully cyclized copolymers were characterized by Fourier transform infrared, 1H NMR, and elemental analysis.

Original languageEnglish
Pages (from-to)6020-6027
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume43
Issue number23
DOIs
Publication statusPublished - 2005 Dec 1

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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