Morphology and rheology of poly(L-lactide)/polystyrene blends filled with silica nanoparticles
Morphology and rheology of poly(L-lactide)/polystyrene blends filled with silica nanoparticles
复制标题
二氧化硅纳米粒子填充的聚（L-丙交酯）/聚苯乙烯共混物的形态和流变学
DOI：
10.1007/s10853-011-5908-7
复制
发表时间：
2012-02-01
影响因子：
4.5
通讯作者：
Yang, Qi
中科院分区：
文献类型：
--
作者：
Zhang, Meng;Huang, Yajiang;Yang, Qi
低聚乳酸含量的聚乳酸共混物在制备大孔生物材料中具有重要的应用价值。然而，PLLA的低粘度使得难以在低PLLA浓度下制备共连续PLLA共混物。本研究采用亲水性二氧化硅纳米粒子对聚苯乙烯/聚乳酸共混物进行形态控制。考察了纳米粒子浓度对PS/PLLA共混体系共连续区间和流变性能的影响。共混物对熔融退火的形态稳定性也确定和讨论的概念粗化模型的共连续结构。结果表明，在低PLLA含量下，将SiO2纳米粒子引入到PS/PLLA共混物中可制备孔径可控的大孔PLLA结构。
The successful development of co-continuous structure from poly(L-lactide) (PLLA) blends by melt mixing with lower PLLA content is highly desired in preparing macroporous biomaterials. However, the low viscosity of PLLA makes it difficult to prepare co-continuous PLLA blends at low PLLA concentration. In this study, hydrophilic silica nanoparticle is adopted to control the morphology of co-continuous polystyrene (PS)/PLLA blends. The influence of nanoparticle concentration on the co-continuity intervals and rheological properties of PS/PLLA blends are examined. The morphological stability of blends against melt annealing is also determined and discussed with a conceptual coarsening model for co-continuous structure. The results demonstrate that the incorporation of silica nanoparticles into PS/PLLA blends can be used to prepare macroporous PLLA structure with controllable pore size at lower PLLA content.