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德克萨斯A&M大学孙国荣学术报告
阅读次数:57 添加时间:2018/7/25 发布: 管理员
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Intricate Bottlebrush Polymer-based Advanced Electronic Materials

 

报告人:国荣德克萨斯A&M大学

报告时间:2018年7月28日(星期六)上午9:00

报告地点:江浦校区 笃行楼318

 

报告摘要:

         The molecular brush architecture consists of a backbone polymer to which a side chain grafted polymer is attached at each repeat unit.  The combinatorial effects of a rigid backbone structure and strong size-exclusion of densely-grafted side chains render the consequential bottlebrush polymer with an intrinsic cylindrical shape, in which the cylinder radius and length is determined by the number of monomer units within the grafts and by the degree of backbone polymerization, respectively.  The advance of modular grafting-through synthesis realizes high degree of control over the synthetic chemistry to tune the chemical composition and function, along with variation of the relative concentric and lengthwise dimensions, throughout the entire macromolecular framework.

    The first part of this presentation will highlight our recent work on developments of block bottlebrush copolymers as nanoscopic molecular pixels in photoresist technology and for both negative-tone and positive-tone electron beam lithography.  The design and synthetic routes to address challenges including achieving vertical orientation, manipulating film thickness and film morphology, tuning photoresist formulation, enhancing substrate adhesion, controlling photoacid diffusion, and maintaining sufficient structural integrity to survive development process, will be described in detail, along with promising results.

    In the second part, a novel bottlebrush-based hole transport material that can achieve unprecedented high degrees of anisotropic alignment of the hole transport moieties in solution-cast hole transport layer (HTL) film will be presented.  The structure-property relationship between obtained anisotropic data with polymer topology, monomer selection, and charge carrier group will be discussed in detail, as well as the effect of film processing.  Preliminary data indicates facile charge transport is commensurate with a high degree of anisotropic alignment, which demonstrates the topological design strategy is of great potential for solution-processable HTL films with high charge mobilities.

 

个人简历:

    Guorong Sun received his Ph.D. in polymer chemistry in 2009 from Washington University in St Louis under the direction of Professor Karen L. Wooley.  He presently works as a Senior Scientist in the Wooley group at Texas A&M University.  His current research focuses on the exploration of intricate molecular brush-based materials for the microelectronics industry and advanced nanomaterials for imaging-guided cancer therapy.

    


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