Synthesis and Properties of Bimodal Mixed Brush Nanoparticles
讲座名称：
Synthesis and Properties of Bimodal Mixed Brush Nanoparticles
讲座时间：
2013-06-22
讲座人：
Brian Benicewicz
形式：
校区：
兴庆校区
实践学分：
讲座内容：
讲座名称： Synthesis and Properties of Bimodal Mixed Brush Nanoparticles
讲座时间： 2013年6月22日（周六） 9:50-10:30
讲座地点： 化学楼207会议室
讲座人： Brian C. Benicewicz, University of South Carolina
讲座内容： RAFT polymerization has been widely used for the synthesis of varying polymer architectures, including polymer brushes on nanoparticles for incorporation into polymer nanocomposites. Surface modification of nanoparticles allows for control of the surface properties and therefore the interface between a nanoparticle and the polymer matrix. Adverse interactions between the nanoparticles, grafted polymer, and polymer matrix can lead to aggregation and autophobic de-wetting. This can be effectively suppressed using a bimodal system containing a small number of long polymer chains on a surface that primarily consists of a short dense brush. I describe our background work on RAFT polymerization on nanoparticle surfaces and one method of using a sequential RAFT polymerization process for the synthesis of bimodal polymer brush anchored nanoparticles. This process allows for the control of brush parameters such as composition, grafting density, and molecular weight for both populations separately and independently. The bimodal brush grafted silica nanoparticles showed superior dispersion and rheological properties over monomodal brush grafted particles in polymer matrices.
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