Professor Haifeng Yu's group makes progress in th
时间:2013-10-21 点击:


·                        Recently, the research team led by Professor Haifeng Yu, Department of Materials Science and Engineering, College of Engineering, Peking University has made an important progress in the fabrication of polymer nanoparticles with Janus structures.         The results titled “Anisotropic Nanoparticles with Controllable Morphologies from Non-Cross-Linked Seeded Emulsion Polymerization” have been published in the famous journal Macromolecular Rapid Communications.(         Polymer Janus nanoparticles (NPs) with anisotropic shape or chemical compositions have received increasing attention due to their diverse applications. In this work, they report on a novel and facile method to fabricate anisotropic NPs via an emulsifier-free seeded emulsion polymerization (SEP) of styrene with non-cross-linked NPs as seeds.         A variety of NPs from minor to significant bulges can be obtained by the control of the feed ratio of the hydrophilic comonomer in seed preparation or the reaction time of the following SEP. It is well known that polyvinyl chloride (PVC) has many outstanding performances and extensive applications, and it is easy to scale up the SEP procedure reported here. Moreover, the anisotropic NPs uniquely combine the so-called Pickering effect with amphiphilicity, and thermodynamically stably exist at the interface of polymer blend, particularly stronger than homogenous particles or block copolymers owing to the increased desorption energy of anisotropic NPs, to allow for a sufficient mixing into smaller sized domains of the dispersed phases. Hence, the non-cross-linking feature of the NPs should benefit for further processing, and the resultant NPs are expected to serve as compatibilizers for immiscible polymer blends, such as PVC and polystyrene (PS) pairs, to achieve excellent performance of polymer alloys.          Due to its importance in the field of polymer materials science and engineering, it has been selected as the back cover of this issue.          Since 2012, Prof. Haifeng Yu has been working in functional materials based on polymer/micro/nano composites. His group is focused on synthesis of novel photo-functional liquid-crystalline materials and further the developing their applications in optical switches, holographic storage, regular array of organic nanostructures, photo-driven materials and smart soft matters.           The present work is cooperative research with Prof. Mingwang Pan in Hebei University of Science and Technology. This work was supported in part by the "National Thousand Talents Plan" for Young Scholars, NSFC, the Natural Science Foundation of Hebei Province, the Doctoral Program and Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry.          
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