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.
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Acknowledgements
This work was supported by funding from the Photon and Quantum Basic Research Coordinated Development Program and the Impulsing Paradigm Change through Disruptive Technology (ImPACT) Program, from the Ministry of Education, Culture, Sports, Science and Technology, Japan. In situ simultaneous SAXS and WAXD measurements were conducted at BL03XU in the Spring-8 facility. We thank Dr. Hiroyasu Masunaga (JASRI) and Dr. Taizo Kabe (JASRI) for their help with the SAXS and WAXD measurements. Rahmawati was supported by the Research and Innovation in Science and Technology Project (RISET-PRO), Ministry of Research, Technology, and Higher Education of Indonesia [loan number 8245-ID].
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Rahmawati, R., Nozaki, S., Kojio, K. et al. Microphase-separated structure and mechanical properties of cycloaliphatic diisocyanate-based thiourethane elastomers. Polym J 51, 265–273 (2019). https://doi.org/10.1038/s41428-018-0148-1
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DOI: https://doi.org/10.1038/s41428-018-0148-1
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