以端羟基聚硅氧烷(PDMS)、4,4,-二苯甲烷二异氰酸酯(MDI)、聚醚多元醇为原料制得端异氰酸酯基(-NCO)聚氨酯预聚体,再与环氧树脂E-44反应制得一系列聚硅氧烷改性聚氨酯/环氧树脂互穿聚合物网络.通过红外光谱、接触角、拉伸试验、动态力学分析、扫描电子显微镜对聚合物体系的结构与性能进行了研究和表征.实验结果表明,聚硅氧烷的引入使得互穿聚合物网络的表面疏水性增强,表面自由能降低,拉伸强度下降但断裂伸长率升高.随着聚硅氧烷用量的增加,聚合物体系的玻璃化转变温度从-45℃提高到了-36℃.
The polyurethane prepolymer terminated with isocyanate group was prepared with the terminal hydroxyl polysiloxane (PDMS),4,4'-diphenyl methane diisocyanate(MDI)and polyether polyols.Then,a series of interpenetrating polymer networks(IPNs) were synthesized with the polyurethane prepolymer and epoxy resin(E-44).The structure and properties of polymers were studied and characterized by infrared spectroscopy (FT-IR),contact angle (WCA),tensile test,dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM).Experimental resuks show that with the introduction of PDMS,the surface hydrophobicity and elongation of interpenetrating polymer networks are increased.The surface tension and tensile strength of IPNs are decreased.The glass transition temperature of polymer system is increased from-45 ℃ to-36 ℃ after the introduction of PDMS.
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