钛酸钾晶须/L型聚乳酸共混物的热稳定性及力学性能研究  

Study on the thermal stability and mechanical property of Poly(L-lactic acid)blends with potassium titanate whiskers

作　　者：杨强[1] 樊国栋[1] 刘保健[1] 姚宝晶[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《化工新型材料》2013年第6期121-122,131,共3页New Chemical Materials

基　　金：陕西省科技攻关项目(2008K07-32);陕西省教育厅攻关项目(2010JS057);陕西科技大学研究生创新基金资助

摘　　要：采用1%～5%不同浓度的碳酸钾晶须(PTW)对精制后的L型聚乳酸(PLLA)进行共混改性,以三氯甲烷为溶剂制成膜。分别用调制式热重分析法(MTGA),红外光谱(FTIR-ATR)和动态力学分析(DMA)对其进行表征。MT-GA结果表明PTW/PLLA共混物热分解的活化能Ea、指前因子Z和比速率ln[rate ratio]等热分解动力学常数均较未添加晶须的PLLA高,且PLLA的热分解过程为一步反应,FTIR-ATR和DMA结果表明,和PLLA相比,PTW/PLLA共混物的力学性能均有所改善。The poly（L-lactic acid）（PLLA）cast film was blend modified using purified PLLA and 1%-5% potassi- um titanate whiskers（PTW）, the purified CHC13 acted as solvent. The specimen was investigated by modulated thermo- gravmitry analysis. The results showed the thermal decomposition process of the PLLA had step reaction, at the same time the value of E, Z and ln[rate ratio]all larger than pure PLLA. The data of Fourier transform infrared spectrometer-attenu- ate total reflection（FTIR-ATR） and dynamic mechanical analyses（DMA） supported that mechanical properties of PLLA were improved.

关 键 词：聚乳酸 钛酸钾晶须 共混改性 热稳定性 力学性能 

分 类 号：R318.08[医药卫生—生物医学工程]