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中文摘要：
以1，4-丁二醇（BD）为引发剂，辛酸亚锡为催化剂，引发对二氧环己酮（PDO）开环聚合，得到双端羟基型聚对二氧环己酮预聚物，再以六亚甲基二异氰酸酯（HDI）为扩链剂制备高分子量的聚对二氧环己酮．采用核磁共振谱对预聚物和扩链产物的结构进行了确认，并详细考察了各种因素对扩链反应的影响．研究结果表明，加入适量的HDI，于150℃反应60min，扩链效率在预聚物基础上可提高52倍，而扩链产物的粘均分子量可达到25．7×10^4g／mol．
英文摘要：
Poly （p-dioxanone） （PPDO） is one of most promising biodegradable materials, however its application was restricted because the rigorous synthetic condition and longer reaction time were needed in order to obtain products with a high molecular weight by common ring-opening polymerization. In this work, a new approach was developed by chain extending of dihydroxyl-terminated PPDO prepolymer（HPPDO） using hexam- ethylenediisocyanate（HDI） as the chain extender in order to obtain high molecular weight PPDO in a short time. HPPDO was prepared by ring-opening polymerization of p-dioxanone （PDO） catalyzed by SnOct2 and initiated by 1,4-butanediol（BD）. The results obtained show that HPPDO prepolymers can react with Hexameth- ylenediisocyanate effectively, and the molecular weights of the resulting chain-extended products increase several decade times in less than one hour compared with the prepolymers. The highest viscosity-average molecular weight of the resulting polymer can reach 257000 g/mol. Both the prepolymer and the chain extended product were characterized by ^1H NMR.
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