磺酸型阴离子聚氨酯离聚物的研究(Ⅰ)——不同离子化程度对性能的影响

Situdies on Sulfonated Polyurethane Anionomers ( I ) ——The Effect of Different lonization Levels on their Properties

合成了不同离子化程度的磺酸型阴离子聚氨酯离聚物,并通过红外光谱、示差扫描量热、动态力学、应力-应变等方法研究了它们的性能,结果表明:离子化程度不同对聚氨酯离聚物的软硬段相容性有较大的影响,引入少量离子,使软硬段相容性提高,引入大量离子时,则又使软硬段相分离程度提高,随着离子化程度的提高,材料的抗张强度、水溶性逐步提高,为控制聚氨酯材料的亲水性及制备水溶性聚氨酯提供了一种新途径。

The sulfonated polyurethane anionomers were synthesized by the ionization of polyurethane, which was prepared by using polytetramethylene oxide (PTMO) as the soft segment and 4,4' -diphenylmethane diisocyanate (MDI) and 1,4-butanediol(BD) as the hard segment, with sodium hydride and r-propane sultone. Their properties were investigated by using IR , differential scanning calorimetry, dynamic mechanical analysis and stress-strain testing. The results indicate that the compatibility of soft segment and hard segment varies with the degrees of ionization. Introducing a small amount of ionic group results in an increase of compatibility of soft and hard segments, but further ionization can increase the degree of phase separation. The mechanical strength and hydrophilicity are gradually increased with the increase of ion content. A new approach for controlling the hydrophilicity of polyurethane and preparing water soluble polyurethane was developed.