Thianthrene-Based Poly(Benzoxazole)s

Abstract

Poly(benzoxazole)s (PBOs) are a class of rigid-rod polymers that are known to have good thermal stability, high mechanical properties, and environmental resistance. Processing of PBOs is difficult since they have low solubility, high glass transition temperatures, and decompose before their melting points. This study is focused on improving the processibility of poly(benzoxazole)s by increasing their solubility while maintaining good thermal stability. With this goal in mind, we synthesized thianthrene-based PBOs from thianthrene-2,7- and 2,8-dicarbonyl chlorides with commercially available bis-o- aminophenols. Polymers were prepared in poly(phosphoric acid) at 90-200 deg C. Transparent PBO films were casted from polymerization solutions and m-cresol depending on solubility. Thermal analysis has shown 10% weight loss in air at > 500 deg C. DMA has shown good mechanical properties with a transition > 400 deg C for polymer I-HAB.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1994
Accession Number
ADA282326

Entities

People

  • L. J. Mathias
  • R. A. Johnson

Organizations

  • University of Southern Mississippi

Tags

DTIC Thesaurus Topics

  • Benzoxazoles
  • Body Weight
  • Chemistry
  • Glass Transition Temperature
  • Mechanical Properties
  • Melting Point
  • Military Research
  • Phase Transformations
  • Phosphoric Acids
  • Polymers
  • Rigid Rod Polymers
  • Rod Polymers
  • Solubility
  • Thermal Analysis
  • Thermal Stability
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Polymer Science and Technology