摘要
The preparation of TiO2/poly（L-lactide-co-ε-caprolactone）（PLCL） nanocomposites and their properties were reported.TiO2nanoparticles were surface modified by ring-opening polymerization of ε-caprolactone（ε-CL）.The resulting poly（ε-caprolactone）-grafted TiO2（g-TiO2） was characterized by Fourier transform infrared spectroscopy（FTIR）,thermogravimetric analysis（TGA） and transmission electron microscopy（TEM）.The g-TiO2can be uniformly dispersed in chloroform and the g-TiO2/PLCL nanocomposites were successfully fabricated through solvent-casting method.The effects of the content of g-TiO2nanoparticles on tensile properties and shape memory properties were investigated.A significant improvement in the tensile properties of the 5% g-TiO2/PLCL mass fraction nanocomposite is obtained：an increase of 113% in the tensile strength and an increase of 11% in the elongation at break over pure PLCL polymer.The g-TiO2/PLCL nanocomposites with a certain amount of g-TiO2content have better shape memory properties than pure PLCL polymer.The g-TiO2nanoparticles play an additional physical crosslinks which are contributed to improvement of the shape memory properties.
制备TiO2/聚(L-丙交酯-ε-己内酯)(PLCL)纳米复合材料并研究其性能。采用ε-己内酯开环聚合法对TiO2纳米粒子进行表面改性,通过傅立叶变换红外光谱(FTIR)、热重分析(TGA)和透射电子显微分析(TEM)对聚己内酯(PCL)接枝改性后的TiO2纳米粒子(g-TiO2)进行表征。g-TiO2纳米粒子能均匀地分散在三氯甲烷溶液中。采用溶液浇铸的方法成功地制备了TiO2/PLCL复合材料。研究g-TiO2纳米粒子的含量对材料力学性能和形状记忆性能的影响。结果表明,5%g-TiO2/PLCL复合材料的力学性能有显著的提高,与纯PLCL相比,抗拉强度提高了113%,伸长率提高了11%。含有g-TiO2纳米粒子的复合材料的形状记忆性能优于纯PLCL。g-TiO2纳米粒子具有物理交联作用,有助于形状记忆效应的提高。
基金
Project(50903023) supported by the National Natural Science Foundation of China
Project(HEUCF201210005) supported by the Fundamental Research Funds for the Central Universities,China
Project(2010RFQXG037) supported by Harbin Special Fund for Innovation Talents of Science and Technology,China
