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以改性二苯基甲烷二异氰酸酯、聚四氢呋喃醚二醇和均苯四甲酸酐为主要原材料,利用酸酐与聚氨酯预聚体反应合成了聚氨酯-酰亚胺(PUI)嵌段共聚物,并对其进行了FT-IR、TGA和DMA测试分析。结果表明,PUI共聚物中存在均苯四酸二酰亚胺结构;酰亚胺结构能够改善共聚物的热分解性能,初始分解温度提高了近20%;PUI共聚物的tanδ主要由软段贡献,当酰亚胺含量的增加,tanδ峰变宽,且峰值变小。在相同温度下的E′随酰亚胺含量的增加而增大,且均高于纯聚氨酯。
Polyurethane-imide (PUI) block copolymers were synthesized by the reaction of anhydride and polyurethane prepolymer with modified diphenylmethane diisocyanate, polytetrahydrofuran ether glycol and pyromellitic dianhydride as the main raw materials. FT-IR, TGA and DMA test analysis. The results showed that there were pyromellitic acid imide structure in the PUI copolymer. The imide structure could improve the thermal decomposition of the copolymer, and the initial decomposition temperature increased by nearly 20%. The tan δ of the PUI copolymer mainly contributed by the soft segment As the imide content increases, the tan δ peak broadens and the peak value decreases. At the same temperature, E ’increased with the increase of imide content, and both were higher than that of pure polyurethane.