目的观察溶液共混热压制备法能否提高纳米磷灰石(HA)/聚D,L-乳酸(PolyD,L杔actide,PDLLA)复合生物材料的力学性能。方法将HA/PDLLA分散至N,N-二甲基甲酰胺(DMF)有机溶剂中,在45℃下不断搅拌缓慢去除有机分散剂,干燥后打碎,放入模具中经100℃热压,获得纳米HA/PDLLA复合材料薄膜。结果透射电子显微镜(TEM)对不同含量的HA复合材料观察发现,纳米HA能被分散在PDLLA基材中。随着HA含量在复合材料中增加,HA出现了明显团聚现象,但总体上呈均匀的分布状态,说明热压前溶液共混处理有利于HA在复合材料中的分散。力学性能测试结果表明,上述溶液共混热压制备法能够增加HA与PDLLA的界面结合力,在合适的HA含量下,提高了材料的弹性模量、断裂应力及拉伸应力。结论溶液共混热压制备法能改善HA/PDLLA复合材料的力学性能。

Objective check if mechanical properties of Nano-apatite(HA)/ Poly(D,L-lactide)(PDLLA) biocomposite is improved by solution-coblending and hot-pressing techniques.Methods HA particles and PDLLA polymer,as two basic compositions of the biocomposite,were firstly dispersed in dimethyl formamide(DMF) dispersant,then the DMF was by inches cleaned out by intensively stirring in 45 oC.The resultant mixture including HA and PDLLA was fallen to pieces,and then pressed at 100oC in hot-pressing machine,finally,thin film of HA/PDLLA composite biomaterials was prepared.Results These results from Transmission Electron Microscopy(TEM) observation showed that HA well-proportioned distribution in PDLLA-matrix bio-composite was obvious with HA contents rising,which suggested that solution co-blending method by DMF dispersant was beneficial to HA decentralization in PDLLA matrix and exhibited symmetrical microstructure in composite films.Mechanical property testing illuminated that tensile modulus,yield ...更多stress and tensile stress of HA/PDLLA composite were improved,which implied that the bonding strength of interface between HA and PDLLA was enhanced.Conclusion These results suggested that technical route of composite preparation employed by us helped to improve mechanical properties of HA/PDLLA bio-composite

乐山师范学院重点资助项目(20804)