文档介绍：中文摘要随着现代医学的发展,新的医学材料的出现,对生物材料要求越来越高, 而聚碳酸酯型聚氨酯材料正是这样一种对生物稳定性、对人体安全很有应用前景的植入材料。为了研究聚碳酸酯聚氨酯的结构与性能,本文合成了两种聚iii;; 酸酯型聚氨酯,并用多种方法进行表征。本论文采用溶液预聚法,以聚碳酸(1,)二醇(PHCDL)为软段, 脂肪族二异***酸酯一,4’.二环己基甲烷二异***酸酯(H12MDI)或六亚***二异***酸酯(HDI)和l,(BDO)为硬段,用二月桂酸二丁基锡为催化ifl 成功地合成出一系列不同NCO/OH摩尔比和不同硬段含量的线型聚碳酸酯型聚氨酯,以期探索研究它们作为一种对人体安全且具有良好的机械性能的心膪瓣膜材料的可能性。利用全反射傅立叶红外光谱(),氢核磁共振光谱法(1H-NMR) 分析了所合成聚合物的结构;利用凝胶渗透色谱法(GPC)测定了聚合物分子量, 并讨论了NCo/oH摩尔比和硬段含量对其的影响;利用示差热扫描量热法(DSC)对合成聚合物的热性能进行了测定,讨论了NCO/OH摩尔比和硬段含量对微相分离的影响。并测试了合成聚合物的力学性能,研究了NCO/OH摩尔比、硬段含量、聚集态结构对合成的聚碳酸酯型聚氨酯弹性体力学性能的影响规律。结果表明,所合成的聚碳酸酯聚氨酯结构中含有氨基甲酸酯的基团。对于该线型聚合物,具有微相分离结构,其微相分离程度和熔融温度不仅与NCO/OE 的摩尔比值和硬段含量有关,还和加料方式有关。通过力学性能的分析,所台成的材料的机械性能不仅与NCO/OH的摩尔比值和硬段含量有关,还和加料力式有关。材料的杨氏模量还与室温存放时间有关。通过GPC分析得出,NCO/OE =,分子量较大,合成的聚合物的分子量随着硬段含量的增加而减小。关键词:聚碳酸酯型聚氨酯,脂肪族聚氨酯,4,4’.二环己基甲烷二异***酸酯, 六亚***二异***酸酯,生物材料 ABSTRACT With thedevelopment ofmodem medical,and theappearance ofnew medical materials.,the requirement of biological materials is polycarbonate·.polyurethane(PCU)materials are considered to be potential candidates forthe next generation ofimplant materials withbiostability and security order tostudy the structure andproperties ofPCU,two seriesofPCU were synthesized and characterized withvarious methods. A series of linear polycarbonate polyurethanes(PCUs)with variation of NCO/OH molar ratioandhardsegment content was synthesized by solutiontwo·step polymerization,,using dibutyltindilaurate(DBTDL)as carbonate diol was used assoftsegment,4,4’-methylenebis(cyclohexyl isoeyanate) 《H12MDI)or hexamethylene diisocyanate(HD0 and 1,4-butanediol ashard segments.. The purpose ofthispaper is toexplore possibility ofPCUs used as secure andbetter mechanical properties heartvalvematerials. The structure ofsynthesized polymers was analyzed by totalreflectionfourier transform infraredspectroscopy(ATR,-FTIR)and H nuclear ic resonance spectroscopy(‘H--NMR).Molecular weights ofpolymers were measured by Gel Permeation Chromatography(GPC)