Accession Number:

ADA143954

Title:

Thermal Degradation Studies of Segmented Thermoplastic Elastomers.

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS UNIV AMHERST

Personal Author(s):

Report Date:

1984-07-01

Pagination or Media Count:

35.0

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

Subject Categories:

  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE