中文摘要：

以聚乙烯亚胺（PEI）为大分子引发剂,辛酸亚锡为催化剂,引发对二氧环己酮（PDO）单体开环聚合,通过graft from法制备了聚乙烯亚胺接枝聚对二氧环己酮接枝共聚物（PEI-g-PPDO）.通过FTIR、1H-NMR、1H-13C-HMQC等对共聚物的分子结构进行了表征.共聚产物的接枝链长度、亲疏水链段含量等可以通过反应物中单体的含量进行有效调控;用DSC对共聚物的热性能和结晶性能研究表明,接枝链段长度越大、PPDO链段含量越高,共聚物的结晶性能也越好.采用芘探针法初步研究了共聚物在水中的胶束化行为,PEI-g-PPDO接枝共聚物在水中可以形成较稳定的聚集体.

英文摘要：

To decrease the toxicity of polyethyleneimine （PEI） and broaden the application of PEI in biomedical materials, amphiphilic graft copolymers of polyethyleneimine-graft-poly（p-dioxanone） （ PEI-g- PPDO） have been synthesized via a ＂graft from＂ strategy using PEI as macro-initiator and stannous octoate （Sn（Oct）2） as catalyst. The molecular structure of the copolymer was characterized by FTIR,^1H-NMR and IH-^13C-HMQC. The results suggested that the molecular structure of the eopolymer could be effectively adjusted by monomer content in reagent. DSC was performed for investigating the thermal and crystalline properties of the copolymer. The crystallization behaviors of the copolymer directly depend on the graft chain length and the PPDO content. The micellization behavior of the copolymer in water was also studied by using pyrene as probe,and showed that the copolymer could form stable micelle in water.