Microphase-separated structure and mechanical properties of cycloaliphatic diisocyanate-based thiourethane elastomers

Rahmawati Rahmawati, Shuhei Nozaki, Ken Kojio, Atsushi Takahara, Naoki Shinohara, Satoshi Yamasaki

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Abstract: Polythiourethane (PTU) and polyurethane (PU) elastomers were prepared from poly(oxytetramethylene) glycol, 1,4-bis(isocyanatomethyl) cyclohexane and a dithiol or diol chain extender with two methylene numbers (tetramethylene (C4) and pentamethylene (C5)). The effect of dithiol and diol and the methylene length of the chain extenders on the microphase-separated structure and mechanical properties of PTU and PU were evaluated. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction measurements revealed that the degree of ordering of hard segment chains in PTUs is lower than that for PU elastomers. However, it was revealed from the DSC, small-angle X-ray scattering and temperature dependent dynamic viscoelasticity measurements that the degree of microphase separation in the PTUs became stronger than that for the PUs. As a result, the mechanical property of PTUs is comparable with PUs. Furthermore, the glass transition temperature for the soft segment of PTU became lower than that for PU. PTU and PU exhibited a larger degree of microphase separation and mechanical property when the chain extender was composed of a tetramethylene (C4) chain compared to a pentamethylene (C5) chain.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalPolymer Journal
Issue number2
Publication statusPublished - Feb 1 2019

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry


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