预聚物
聚氨酯
材料科学
弹性体
动态力学分析
扩展器
复合材料
高分子化学
胺气处理
聚合物
化学
有机化学
作者
Shijie Zhang,Kaijie Wang,Shilin Sang,Yuanyuan Li,Tang Jia-ling
摘要
Abstract Four different systems of cast polyurethane elastomers were prepared through two‐step method by adjusting different isocyanates and amine chain extenders. The blocked polyurethane prepolymer synthesized by the reaction of methyl ethyl ketoxime (MEKO) and the prepolymer weakens the reactivity with the amine chain extender. The mechanical and thermal properties of cast polyurethane prepared by different combinations were analyzed through comparison. The microphase separation of hard and soft segments structure in different systems were observed by using atomic force microscope (AFM). Through dynamic mechanical analysis (DMA), the influence of various structures on the loss factor is discussed. Studying the dynamic endogenous heat of cast polyurethane (CPU) by changing the hard segment structure provides a novel idea for the construction of polyurethane with low‐damping structure.
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