碳纤维增强羟基磷灰石/聚乳酸复合生物材料的制备和力学性能  

Preparation and Mechanical Properties of Carbon Fiber Reinforced Hydroxyapatite/Polylactide Biocomposites

作　　者：沈烈[1] 乔飞[1] 张稚燕[1] 

机构地区：[1]浙江大学高分子科学与工程学系,杭州310027

出　　处：《实验力学》2007年第3期385-389,共5页Journal of Experimental Mechanics

基　　金：浙江省科技计划重点科研工业项目(No2005C21049)

摘　　要：为了提高羟基磷灰石粒子和碳纤维与聚乳酸之间的粘接力和相互作用力,对羟基磷灰石和碳纤维分别进行表面改性。羟基磷灰石采用表面接枝聚乳酸的方法,结果在红外谱图中1740cm-1处出现了羰基的吸收峰,经热失重分析接枝率达到5%。碳纤维则用硝酸进行氧化处理后表面变粗糙,有效地提高了与聚乳酸基体的界面结合力。采用溶液共混-热压方法制备了碳纤维增强羟基磷灰石/聚乳酸三元复合生物材料,研究了其剪切强度随羟基磷灰石含量和体外降解时间的变化关系。复合材料的剪切强度随HA含量的增加存在一个峰值,最大剪切强度为340MPa。在37℃PBS模拟体液中体外降解16周后,剪切强度维持在190MPa左右,有很好的强度保持性,观察复合材料的微观结构发现,聚乳酸降解后碳纤维和基体之间的界面出现空隙。In order to improve the interaction and adhesion between hydroxyapatite （HA） particles, carbon fiber （CF） and polylactide（PLA）, the HA nano-particles were surface grafted by PLA and characterized by IR spectra and thermal gravimetric analysis （TGA）. The IR spectra showed a peak at 1740^-1 indicating the absorption of carbonyl, and the grafting ratio was determined by TGA analysis to be about 5%. After oxidation treatment by nitric acid, the surface of the carbon fibers became rougher, which increased the adhesion between the polylactide and the carbon fibers. Carbon fiber reinforced HA/PLA composite was then prepared by solvent blending-thermal press method. The shear strength changes of the composites versus the HA content and in vitro degradation were further investigated. As the HA content increased, the shear strength also increased with a peak strength observed at 340 MPa. After in vitro degradation in the phosphate buffer solution （PBS） at 37℃, the shear strength leveled off around 190 MPa and showed a good maintenance of mechanical properties. Gaps between the PLA matrix and carbon fibers were observed from the microstructure of the composites after degradation.

关 键 词：聚乳酸 碳纤维 羟基磷灰石 剪切强度 体外降解 

分 类 号：TB332[一般工业技术—材料科学与工程]