Effects of hard- and soft-segment composition on pyrolysis characteristics of MDI, BD, and PTMG-based polyurethane elastomers

Shogo Kumagai, Suguru Motokucho, Ryosuke Yabuki, Airi Anzai, Tomohito Kameda, Atsushi Watanabe, Hisayuki Nakatani, Toshiaki Yoshioka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A study of the morphology changes in polyurethane elastomers (PUEs) containing different hard- and soft-segment ratios during ramped-heating pyrolysis revealed that selectivity of urethane bond cleavage is controlled by only the segment composition. Several PUEs were synthesized using 4,4′-diphenylmethane diisocyanate, 1,4-butanediol, and poly(oxytetramethylene glycol) (PTMG) to examine the influence of segment composition on pyrolysis characteristics by pyrolysis–gas chromatography/mass spectrometry, evolved gas analysis–mass spectrometry, and isoconversional kinetic studies. Soft-segment-rich PUEs tended to undergo urethane bond cleavage via a 4-membered-ring transition state, while the linkages in other compositions were selectively cleaved via a 6-membered-ring transition state. The reaction selectivity can be explained by the different conformations of the urethane bonds: in the hard-segment domains by H-bonds between urethane unit N–H and C[dbnd]O groups, and in soft-segment-rich environments by H-bonds between urethane N–H groups and PTMG –O– linkages. The mechanism of PTMG pyrolysis was the same for all PUEs.

Original languageEnglish
Pages (from-to)337-345
Number of pages9
JournalJournal of Analytical and Applied Pyrolysis
Volume126
DOIs
Publication statusPublished - 2017 Jul

Keywords

  • Hard segment
  • Polyurethane elastomer
  • Pyrolysis mechanism
  • Pyrolyzer
  • Soft segment

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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