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为提高生物可降解聚ε-己内酯/聚乙二醇聚氨酯的预聚物的性能,以辛酸亚锡为催化剂、乙二醇或聚乙二醇为引发剂,引发ε-己内酯开环聚合制备双端羟基聚ε-己内酯和聚ε-己内酯-聚乙二醇-聚ε-己内酯三嵌段共聚物,用作制备聚ε-己内酯/聚乙二醇聚氨酯的预聚物.采用FT-IR1、HNMR、DSC、GPC、XRD等对聚合产物的结构和性能进行分析表征确认.结果表明:通过改变单体与引发剂的比例可控制聚合物的相对分子质量;聚ε-己内酯均聚物随着其相对分子质量的增大,熔点小幅升高,结晶度从58%逐渐提高到72%;共聚物中,随着聚乙二醇相对分子质量的增加,熔点升高到69.3℃.通过引入聚乙二醇,预聚物呈现相分离结构,结晶度变高.
In order to improve the performance of the prepolymer of biodegradable poly (ε-caprolactone) / polyethylene glycol polyurethane, ethylene glycol or polyethylene glycol was used as a catalyst to initiate ε-caprolactone opening Ring Polymerization Two-terminal hydroxy poly-ε-caprolactone and poly ε-caprolactone-polyethylene glycol-poly ε-caprolactone triblock copolymer were prepared for the preparation of poly ε-caprolactone / polyethylene di Alcohol polyurethane prepolymer.The structures and properties of the polymerization products were confirmed by FT-IR1, HNMR, DSC, GPC and XRD.The results showed that the relative ratio of the monomers to the initiator Molecular weight; poly (ε-caprolactone) homopolymer with its relative molecular mass increases, the melting point increased slightly, the crystallinity gradually increased from 58% to 72%; copolymer, with the relative molecular weight of polyethylene glycol As the mass increases, the melting point increases to 69.3 ° C. By introducing polyethylene glycol, the prepolymer exhibits a phase-separated structure and the crystallinity becomes high.