聚丁二烯型聚氨酯/纳米二氧化硅弹性体的制备与性能

Preparation and properties of polybutadiene based polyurethane/Nano-silica elastomers

以端异氰酸酯基聚丁二烯(ITPB)为基体,纳米二氧化硅(Nano-silica)为固化剂,制备了聚丁二烯型聚氨酯/Nano-silica弹性体。阐述了ITPB/Nano-silica弹性体的制备机理,用傅里叶变换红外光谱(FT-IR)对ITPB、Nano-silica和ITPB/Nano-silica弹性体的结构进行了表征,并对其力学性能、耐溶剂性进行了研究。结果表明,随着Nano-silica加入量的增加,ITPB/Nano-silica弹性体的拉伸强度、断裂伸长率、断裂强度及硬度均有明显提高,Nano-silica加入量为6%(质量分数)时,ITPB/Nano-silica弹性体的断裂伸长率达到最大值220.14%,当Nano-silica加入量为8%(质量分数)时,ITPB/Nano-silica弹性体的拉伸强度达到最大值7.11 MPa;Nano-silica加入量越多,ITPB/Nano-silica弹性体的耐溶剂性能越好。

With Homemade isocyanate-terminated polybutadiene(ITPB)as the matrix and Nano-silica as the curing agent,polybutadiene based Polyurethane/Nano-silica elastomer was prepared.This paper illustrated the mechanism of the preparation of ITPB/Nano-silica elastomer.The structures of ITPB,Nano-silica and ITPB/Nano-silica elastomer were characterized by Fourier transform infrared spectroscopy(FT-IR),and the mechanical properties and solvent resistance were studied.The results showed that with the increase of Nano-silica addition,the tensile strength,elongation at break,fracture strength and hardness of ITPB/Nano-silica elastomer increased significantly.When Nano-silica addition was 6%,the elongation at break of ITPB/Nano-silica elastomer reached maximum 220.14%.When Nano-silica addition was 8%,the tensile strength of ITPB/Nano-silica elastomer reached maximum 7.11 MPa;the more the amount of Nano-silica added,the better the solvent resistance of ITPB/Nano-silica elastomer.