高分子科学系列讲座第267讲,郭洪霞 研究员,Nanoparticles in directing the compatibilization behavior and the morphological transition of immiscible polymer blends under shear flow

文章来源:    发布时间:2017-11-27
报告题目:Nanoparticles in directing the compatibilization behavior and the morphological transition of immiscible polymer blends under shear flow(NO.PSLAB267-PS2017-24)
报 告 人:郭洪霞 研究员
单  位:中国科学院化学研究所

  With the recent development in particle synthesis a large variety of nanoparticles, characterized by different surface properties and shapes, can be generated. Now, besides copolymers, adding nanoparticles is taken to be an effective and economic alternative to the conventional method of compatibilizing polymer blends by copolymers. Particularly, the surface properties of nanoparticles manipulate their positional distribution inside the polymer blends, and hence offer a high control for engineering polymer nanocomposite with desired structures and properties. Although recent studies have shed more light onto the close relation between surface chemistry of NPs and their compatibilizing capability in polymer blends, the understanding of how NPs control the miscibility behavior and the morphology of polymer blends is far from complete. Additionally, in many polymer-processing operations, shear flow is usually involved. Shear flow can affect the phase transitions and induce mixing or demixing by shifting the phase boundaries, which improves or weakens the component compatibility and also changes the morphology as well as stability of the domain, due to the complex coupling between kinetics, thermodynamics, hydrodynamics, and viscoelasticity. In comparisons to researches in the area of the traditional ternary blends (two immiscible homopolymers and one copolymer), investigations on the effect of shear flow on the behaviour of phase-separating homopolymers containing nonoparticles are rather scarce. Considering the differences between copolymers and nanoparticles, introducing nanoparticles into an immiscible polymer blend could make the phase behaviour under flow more complex as these particles can be selectively located in the homopolymer phases or at the interface depending on their surface chemistry. Therefore, the ternary blends containing nanoparticles with different surface chemistry or shapes are highly interesting systems to study. Knowledge of the response of these systems to shear flows opens up possibilities for the rational design and fabrication of ordered nanostructures and advanced nanocomposites..

 郭洪霞 研究员

郭洪霞,中国科学院化学研究所高分子物理与化学国家重点实验室研究员,博士生导师。1996年于中国科学院物理研究所获凝聚态物理博士学位,1996.09-2000.09年在中国科学院化学研究所任助理研究员、副研究员, 2000.09-2004.02年在德国马普高分子研究所从事博士后研究, 2004.03-2005.12年,在美国西北大学材料科学与工程系高级研究员。2006年01月回国在中国科学院化学研究所高分子物理与化学国家重点实验室工作,2007年入选中国科学院 “百人计划”人才项目。近年主要从事软物质体系的理论计算与模拟, 在发展有效模型、建立多尺度模拟方法、和开发高性能模拟算法等方面取得了系列重要研究成果,并对高分子及其复杂体系的相行为和动力学、界面性质与界面行为、取向和流变学性质进行了深入研究。近五年来在ACSNano, SoftMatter, nanotechnology, Macromolecules,PCCP等核心期刊发表文章50余篇。主持或参加国家自然科学基金项目五项、科技部973项目和国家重点研发计划项目各一项。