纳米碳酸钙/聚左旋乳酸复合材料的制备与性能

Preparation and properties of nanometer calcium carbonate/poly(L-lactide) composite materials

目的:生物降解材料(聚左旋乳酸)存在初始强度低和降解速率快等局限性,利用纳米技术有望解决生物降解材料的力学性能缺陷。制备纳米碳酸钙/聚左旋乳酸复合材料并评价其力学性能。方法:实验于2002-09/2004-01在吉林大学化学学院实验室完成。采用溶液共混法制备纳米碳酸钙/聚左旋乳酸复合材料。将聚左旋乳酸、10%和30%的纳米碳酸钙/聚左旋乳酸复合材料加工成60mm×6mm×2mm的条形试样,在Instron-1121型材料试验机上测试弯曲强度和拉伸弹性模量,加载速度为1mm/min;用XCJ-4简支梁式试验冲击仪测试无缺口冲击强度。结果:力学测试显示10%,30%纳米碳酸钙/聚左旋乳酸复合材料的冲击强度、弯曲强度、拉伸弹性模量均高于聚左旋乳酸材料,差异有显著性意义(P<0.05)。30%纳米碳酸钙/聚左旋乳酸复合材料的冲击强度、弯曲强度、拉伸弹性模量均高于10%纳米碳酸钙/聚左旋乳酸复合材料,差异有显著性意义(P<0.05)。结论:纳米碳酸钙与聚左旋乳酸复合后力学性能有所提高。30%纳米碳酸钙/聚左旋乳酸复合材料力学性能最佳。

AIM： Biodegradable material poly（L-lactide） （PLLA） is limited due to low initial strength and fast degradation rate, and the mechanical properties of PLLA could be improved by nano technology. This study is designed to prepare nanometer calcium carbonate （NCC）/PLLA composites and evaluate the mechanical properties. METHODS： The experiment was carried out in the laboratory of College of Chemistry, Jilin University from September 2002 to January 2004. NCC/PLLA composite material was prepared by solution blended process. The PLLA and 10% or 30% NCC/PLLA composites were fabricated as strip samples in a size of 60 mm×6 mm×2 mm. Type Instron-1121 material tester was applied to detect the bending strength and tensile elastic modulus, with a loading velocity of 1 mm/min. Non-notched impact strength was test by the impact test of simply supported beams. RESULTS： The results of mechanical test indicated that the impact strength, bending strength and tensile elastic modulus of 10% or 30% NCC were significantly higher than those of PLLA （P 〈 0.05）, and these indices were also significantly higher in 30% NCC/PLLA composite material compared with 10% NCC/PLLA （P 〈 0.05）. CONCLUSION： The NCC compounded with PLLA can increase its mechanical properties, which are the best for the 30% NCC/PLLA composites.