Effect of side groups of polymer glycol on microphase-separated structure and mechanical properties of polyurethane elastomers

Ken Kojio, Sadaharu Nakamura, Mutsuhisa Furukawa

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The effect of side methyl and dimethyl groups of the soft segment component on the microphase-separated structure and mechanical properties of Polyurethane elastomers (PUEs) was investigated. Poly(oxytetramethylene) glycol (PTMG), and PTMG incorporating dimethyl groups (PTG-X) and methyl side groups (PTG-L) were used as a polymer glycol, which forms a soft segment in the PUEs. The PUEs were synthesized with 4,4′-dipheylmethane diisocyanate [1, 1′- methylenebis(4-isocyanatobenzene)], 1,4-butane diol, and 1,1,1-trimethylol propane by a prepolymer method. The degree of microphase separation of the PUEs became weaker with increasing side group content in polymer glycols. Dynamic viscoelastic properties measurement showed reorganized-crystallization and melting of the soft segment for the PUEs based on PTMG, PTG-L, and PTG-X with a lower content of the side groups, but not for a PTG-L and PTG-X with higher content of the side groups. Tensile testing revealed that increasing methyl group concentration made the PUEs soften and weaken. The PTMG-based PUEs obviously exhibited strain-induced crystallization of the soft segment chains during elongation process. In contrast, for the PTG-L and PTG-X-based PUEs, crystallinity decreased with increasing side group content, and the PUEs with PTG-L and PTG-X with highest methyl group content did not crystallize even at a large strain.

Original languageEnglish
Pages (from-to)2054-2063
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume46
Issue number19
DOIs
Publication statusPublished - Oct 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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