Progress In Liquid-crystalline Block Copolymers
时间:2013-10-25 点击:

 

·               Recently, Professor Haifeng Yu from the Department of Materials Science and Engineering, College of Engineering has made an important progress in liquid-crystalline block copolymers. The results titled “Photoresponsive Liquid–Crystalline Block Copolymers: from Photonics to Nanotechnology” have been published in the famous journal “Progress in Polymer Science”(5-Year Impact Factor: 31.7).          http://www.sciencedirect.com/science/article/pii/S0079670013001020/pdfft?md5=6d81bf2208f64b966ef61d5ce3542d8c&pid=1-s2.0-S0079670013001020-main.pdf          Being one of the most fascinating multi-functional materials, photoresponsive liquid crystalline block copolymers (PLCBCs) have attracted much attention because of their light controllable properties of supramolecularly self-assembled structures. These originate from their unique features combining the advanced function of photoresponsive liquid crystalline polymers (PLCPs) with the inherent property of microphase separation of block copolymers (BCs).          Benefiting from recent progresses in materials chemistry, diverse PLCBCs have been designed and synthesized by controlled polymerization using different synthetic routes and strategies. Generally, PLCBCs show different performance depending on their self-organization and molecular composition, with the PLCP blocks in the minority phase or in the majority phase.           One of the most important properties of PLCBCs is supramolecular cooperative motion, resulted from the interactions between liquid crystalline elastic deformation and microphase separation, which enables them to self-assemble into regularly ordered nanostructures in bulk films with high reliability. These nanostructures contribute to improving the optical performance of polymer films by eliminating the scattering of visible light, in favor of their photonic applications.          With the help of liquid crystal alignment techniques, both parallel and perpendicular patterning of nanostructures has been fabricated in macroscopic scale with excellent reproducibility and mass production, which provides nanotemplates and nanofabrication processes for preparing varieties of nanomaterials. Recent findings about PLCBCs including their synthesis, diagram of microphase separation, structure-property relationship, precise control of nanostructure as well as their applications in photonics to nanotechnology are reviewed in the paper.          Since 2012, Prof. Haifeng Yu’s team 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.           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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