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Segmented polyurethanes containing movable rotaxane units on the main chain: Synthesis, structure, and mechanical properties
Polymer ( IF 4.6 ) Pub Date : 2020-03-08 , DOI: 10.1016/j.polymer.2020.122358
Jun Sawada , Hiromitsu Sogawa , Hironori Marubayashi , Shuichi Nojima , Hideyuki Otsuka , Ken Nakajima , Yosuke Akae , Toshikazu Takata

In this study, segmented polyurethanes (SPUs), including those with rotaxane structures, were synthesized in high yields (<83%) using a [2]rotaxane diol that has a hydroxy group in each wheel and axle component. The traditional prepolymer method was applied to introduce rotaxane structures at different locations in the soft segment and at the boundary between soft and hard segments. The mechanical properties of the formed SPUs were evaluated via tensile tests, and we determined that the introduction of an appropriate amount of rotaxane structure improved their extensibility, toughness, and stress-relaxing properties. Differential scanning calorimetry (DSC), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR) synchrotron X-ray measurements revealed that the phase-separated structures of the SPUs were almost independent of the amount of rotaxane. The highly movable rotaxane scaffold was even effective for toughening the SPU, which is a physically cross-linked network, without changing their phase-separated structures.



中文翻译:

在主链上包含可移动轮烷单元的分段聚氨酯:合成,结构和机械性能

在这项研究中,使用在每个车轮和车轴组件中都有羟基的[2]轮烷二醇,以高收率(<83%)合成了分段聚氨酯(SPU),包括具有轮烷结构的聚氨酯。应用传统的预聚物方法在软链段的不同位置以及软链段和硬链段之间的边界处引入轮烷结构。通过拉伸试验评估了形成的SPU的机械性能,我们确定引入适量的轮烷结构可以改善其扩展性,韧性和应力松弛性能。差示扫描量热法(DSC)衰减全反射傅立叶变换红外光谱(ATR-FT-IR)同步加速器X射线测量显示,SPU的相分离结构几乎与轮烷的量无关。高度移动的轮烷支架甚至在不改变其相分离结构的情况下,对增强SPU(一种物理交联的网络)也有效。

更新日期:2020-03-09
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