Thermal Degradation Studies of Segmented Thermoplastic Elastomers.

Abstract

Flash pyrolysis of segmented thermoplastic elastomers has been performed. The produces were GC separated and MS identified. Most of the products of the soft segments were accounted for by random scission of one backbone bond to give macroradicals which eliminate various compounds via intramolecular shifts of hydrogens or methyl groups and ring closure. Certain products were better rationized by direct intramolecular rearrangements. In the case of polyetherpolyurethane chain extended with BI, it is shown that the hard segment decomposes before the soft segment in agreement with earlier TGA results. This study showed that pyrolysis-GC-MS can be used either to elucidate the mechanism of thermal decomposition of segmented block copolymers or to determine the structures of related unknown copolymers. Only in the case of the polyimide hard segment were we unable to detect its pyrolysate. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1984
Accession Number
ADA143954

Entities

People

  • J. C. W. Chien
  • J. L. Fan

Organizations

  • University of Massachusetts Amherst

Tags

Communities of Interest

  • C4I

DTIC Thesaurus Topics

  • Anhydrides
  • Biomedical And Dental Materials
  • Block Copolymers
  • Chemistry
  • Conductive Polymers
  • Copolymers
  • Elastomers
  • Flow Rate
  • Mass Spectra
  • Mass Spectrometers
  • Mass Spectrometry
  • Materials
  • Materials Laboratories
  • Optical Materials
  • Polymer Chemistry
  • Polymeric Films
  • Polymers

Readers

  • Organic Chemistry
  • Polymer Science and Technology

Technology Areas

  • Microelectronics