纳米TiO2／聚乳酸复合材料的制备和表征  

Preparation and characterization of nano-TiO_2/polylactide composites

作　　者：庄韦[1] 张建华[1] 刘靖[1] 张强[1] 胡柏星[1] 沈健[1] 

机构地区：[1]南京大学化学化工学院,南京210093

出　　处：《复合材料学报》2008年第3期8-11,共4页Acta Materiae Compositae Sinica

基　　金：江苏省科技计划项目(BE2005318)

摘　　要：采用原位聚合的方法制备了有机化处理过的纳米TiO2粒子质量分数分别为1 wt%、3 wt%、5 wt%和10 wt%的4种纳米TiO2/聚乳酸复合材料。SEM结果表明,当纳米TiO2粒子质量分数较低时,纳米TiO2在聚乳酸基体中呈现均匀稳定分散,而质量分数较高时则发生团聚。通过力学和热学等性能测试发现复合材料的最大热分解温度、玻璃化转变温度和力学性能相对于聚乳酸有较大幅度提高,其中纳米TiO2的质量分数为3 wt%时改善效果最明显,其最大热分解温度、玻璃化转变温度分别比聚乳酸提高了25.3℃和4.9℃,拉伸强度、断裂伸长率和弹性模量分别提高了83.6%、6.73%和129.4%。The in-situ polymerization method was employed to prepare nano-TiO2/polylactide （PLA） composites with different contents of TiO2. Scanning electron microscope （SEM） was used to study the dispersion of surfacedmodified nano-TiO2 in the composites and the results show that nano-TiO2 dispersed in the PLA evenly when the content of TiO2 is low（less than 3 wt%）. The differential scanning calorimeter（DSC）, thermogravimetry analysis （TGA） and Erichsen test were used to study the thermal and mechanical properties of the composites. The results show that both the thermal and mechanical properties are markedly improved when the content of TiO2 is 3 wt%. Its maximum temperature of heat decomposition Tmax and the glass transition temperature Tg increase by 25.3℃ and 4. 9℃, respectively, and simultaneously, its tensile strength, elongation at break and Young＇s modulus increase by 83.6%, 6.73% and 129. 4%.

关 键 词：聚乳酸 纳米TIO2 复合材料 原位聚合 

分 类 号：TB332[一般工业技术—材料科学与工程]