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首页> 外文期刊>Journal of Applied Polymer Science >Shape-memory polyurethanes minimally crosslinked with hydroxyl-terminated AB2-type hyperbranched polyurethanes
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Shape-memory polyurethanes minimally crosslinked with hydroxyl-terminated AB2-type hyperbranched polyurethanes

机译：形状记忆聚氨酯与端羟基AB2型超支化聚氨酯的交联极少

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摘要

A series of shape-memory polyurethanes based on poly(ε-caprolactone) diol were prepared with novel hydroxyl-terminated hyperbranched polyurethanes as crosslinkers and were characterized by Fourier transform infrared spectroscopy, 1H-NMR, gel permeation chromatography, differential scanning calorimetry, scanning electron microscopy, wide-angle X-ray diffraction, dynamic mechanical analysis, tensile testing, and shape-memory testing. The molecular weight of the soluble polymers ranged from 5.1 × 10~4 to 29.0 × 10~4 g/mol. The differential scanning calorimetry and wide-angle X-ray diffraction data indicated that when the crystallinities of the crosslinked polymers were compared to that of linear polyurethane, this parameter was improved when the crosslinker was in low quantity. The storage modulus ratios obtained from the dynamic mechanical analyses data of the crosslinked polymers were also high compared to that of the linear polyurethane. As a result, crosslinked polymers showed better shape-memory properties compared to the linear polyurethanes. Also, the that incorporation of the hyperbranched polymer as a crosslinker into the polyurethane chain improved the thermal and mechanical properties of the polymer.
机译：以新型的端羟基超支化聚氨酯为交联剂，制备了一系列基于聚（ε-己内酯）二醇的形状记忆聚氨酯，并通过傅里叶变换红外光谱，1H-NMR，凝胶渗透色谱，差示扫描量热法，扫描电子进行了表征。显微镜，广角X射线衍射，动态力学分析，拉伸测试和形状记忆测试。可溶性聚合物的分子量范围为5.1×10〜4至29.0×10〜4 g / mol。差示扫描量热法和广角X射线衍射数据表明，当将交联的聚合物的结晶度与线性聚氨酯的结晶度进行比较时，当交联剂为少量时，该参数得到改善。与线性聚氨酯相比，从交联聚合物的动态力学分析数据获得的储能模量比也很高。结果，与线性聚氨酯相比，交联聚合物显示出更好的形状记忆性能。而且，将超支化聚合物作为交联剂掺入聚氨酯链中改善了聚合物的热和机械性能。

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