AbstractPolythiourethane (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.Polythiourethane (PTU) elastomers, which are obtained by the reaction between polyol, diisocyanate, and dithiol, are expected to have some properties that polyurethanes (PUs) do not have. Herein, the microphase-separated structure and mechanical properties of the 1,4-bis(isocyanatomethyl) cyclohexane-based PTUs were investigated. It was revealed from the differential scanning calorimetry, small-angle X-ray scattering and dynamic viscoelasticity measurements that the PTUs possess a stronger degree of microphase separation and lower glass transition temperature of soft segment compared to that of PUs.

中文翻译：

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脂环族二异氰酸酯基硫氨酯弹性体的微相分离结构和力学性能

摘要 聚硫氨酯 (PTU) 和聚氨酯 (PU) 弹性体由聚（氧四亚甲基）二醇、1,4-双（异氰酸根合甲基）环己烷和具有两个亚甲基数（四亚甲基 (C4) 和五亚甲基 (C5)）的二硫醇或二醇扩链剂制备而成。 . 评估了二硫醇和二醇以及扩链剂的亚甲基长度对 PTU 和 PU 的微相分离结构和机械性能的影响。差示扫描量热法 (DSC) 和广角 X 射线衍射测量表明 PTU 中硬链段的有序度低于 PU 弹性体。然而，从 DSC、小角度 X 射线散射和温度相关动态粘弹性测量结果表明，PTU 中的微相分离程度变得比 PU 更强。因此，PTU 的机械性能可与 PU 相媲美。此外，PTU 软段的玻璃化转变温度变得低于 PU。与五亚甲基（C5）链相比，当扩链剂由四亚甲基（C4）链组成时，PTU和PU表现出更大程度的微相分离和机械性能。聚硫氨酯（PTU）弹性体，由多元醇，预计二异氰酸酯和二硫醇具有聚氨酯 (PU) 不具备的某些特性。在此，研究了基于 1,4-双（异氰酸根合甲基）环己烷的 PTU 的微相分离结构和机械性能。差示扫描量热法显示，