两步法制备高分子量聚乳酸/二氧化硅纳米复合材料  

Preparation of High Molecular Weight Poly( lactic acid) / SiO_2 Nanocomposite by Two-steps

作　　者：戈欢 朱志国[1] 尹会会[2] 王锐[1,2] 张秀芹[1] 王睿[1] 

机构地区：[1]北京服装学院材料科学与工程学院,北京100029 [2]四川大学高分子科学与工程学院高分子科学工程国家重点实验室,四川成都610065

出　　处：《塑料》2015年第2期68-71,共4页Plastics

基　　金：北京服装学院研究生科研创新(x2014-089)

摘　　要：通过熔融缩聚制备出中等分子量聚乳酸/二氧化硅纳米复合材料,并利用固相缩聚提高产物的熔点和分子量,探索不同纳米粒子的添加量和反应时间制备高分子量纳米复合材料工艺。通过DSC测定固相缩聚后的产物熔点达到175℃,GPC测定分子量可以达到105以上。由TEM分析可以看出纳米粒子在聚乳酸基体中达到纳米级均匀分散,热重分析显示一定范围内纳米复合材料的热稳定性随着添加量的增加而提高,通过偏光显微镜(POM)可以看出纳米粒子能有效地促进结晶但球晶规整度下降。Medium molecular weight poly（lactic acid）/ SiO2 nanocomposite was prepared by melt polycondensation and followed by solid state polycondensation（SSP） in order to improve melting point and molecular weight. The amount of different nanoparticles and different reaction time of preparation on the molecular weight of nanocomposite were investigated. Melting point could be reached 175 ℃ and molecular weight could be recahed more than 105 after SSP. Nanoparticles could be welldispersed in the matrix and thermal stability of the nanocomposite improved with the increase of nanoparticles in a certain range. Nanoparticles accelerated the crystallization but spherulitc regularity declined by means of polarizing microscope （ POM ）

关 键 词：聚乳酸 纳米二氧化硅 纳米复合材料 分子量 热稳定性 

分 类 号：Q946.816[生物学—植物学]