HagPDLA与左旋聚乳酸的混研究.docxVIP

北京化工大学硕士学位论文能力，阐明了复合材料中HA-g．PDLA的含量变化对PLLA结晶性能的影 北京化工大学硕士学位论文 能力，阐明了复合材料中HA-g．PDLA的含量变化对PLLA结晶性能的影 响规律； 3、研究对比HA-g-PDLA／PLLA与PLLA、HA／PU。A、PDLA／PLLA、 HA／PDLA／PLLA、HA-g-PLLA／PLLA等五组共混样品的结晶行为，实验 结果表明HA-g-PDLA／PLLA共混产物的结晶效果最好，分析了产生这种 结果的原因； 4、分别以HA和HA-g_PDLA作为PDLA／PLLA共混样品的添加剂， 研究共混产物中不同晶体的结晶行为，对比并分析了HA和HA-g-PDLA 对PLA均聚物晶体和立构复合晶形成的影响，阐释了HA-g-PDLA／PLLA 复合材料的结晶机理。 关键词：羟基磷灰石，聚乳酸，晃面相容性，立构复合晶，成核剂 万方数据 AbstractRE Abstract RE SEARCH ON THE BLEND OF I|峙PDLAAND PLLA AB STRACT Hydroxyapatite(HA)is clinically recognized as a kind of bone substitute material，however,owning to low—strength，brittleness and easiness to fatigue， it is difficult to be used as bone substitute materials separately．B lending HA with degradable polymer is a useful method to improve the properties of HA． Polylactide(PLA)is one kind of these polymers because of its biodegradability and biocompatibility．PLA can improve the fragile， low-toughness and other defects of HA，conversely HA can neutralize acidic products produced by the degradation of PLA．Due to poor dispersion in the polymer,grafting polymerization method is often used to modify the HA surface preventing the aggregation of HA nanoparticles．When poly(D—lactide) (PDLA)is grafted onto the surface of HA，it may improve interfacial compatibility between HA and poly(L-lactide)(PLLA)，and also it can form stereocomplex crystals(sc)with PLLA matrix，improving the crystallization properties of overall composite materials，thus HA-g-PDLA has the potential to further enhance mechanical properties of HA composite and has favorable application foreground． This work focuses on the crystallization behavior of HA-g-PDLA／PLLA， it mainly includes the following parts： llI 万方数据 北京化工大学硕士学位论文To 北京化工大学硕士学位论文 To improve the poor dispersion of HA nano-particles in PLLA matrix， PDLA was grafted on HA surface，TGA，IR and XPS results show that the reaction was successful，and then the experiment conditions were optimized． SEM results show that the interfacial compatibility between HA