Graft polymerization of vinyl monomers onto nanosized alumina particles |
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Authors: | Min Zhi Rong Qiu Long Ji Ming Qiu Zhang Klaus Friedrich |
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Institution: | a Materials Science Institute, Zhongshan University, Guangzhou 510275, China b Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Zhongshan University, Guangzhou 510275, China c Institute for Composite Materials (IVW), University of Kaiserslautern, D-67663 Kaiserslautern, Germany |
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Abstract: | To enhance the interfacial interaction in alumina nanoparticles filled polymer composites, an effective surface modification method was developed by grafting polystyrene and polyacrylamide onto the particles. That is, the alumina surface was firstly treated with silane, followed by radical grafting polymerization in aqueous or non-aqueous systems. Results of infrared spectroscopy and dispersiveness in solvents demonstrated that the desired polymer chains have been covalently bonded to the surface of the alumina particles. They also greatly changed their surface characteristics. In addition, effects of polymerization conditions, including ways of monomer feeding, concentrations of monomer and initiator, and reaction time, on the grafting reaction were presented. It was found that the growing polymer radicals and/or the grafted polymer chains had a blocking effect on the diffusion of radicals or monomers towards the surface of nanoalumina. This was due to the fact that the interaction between the solvent and the grafted polymers was weaker than that between the grafted polymers and the nanoparticles. |
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Keywords: | Nanoparticles Graft polymerization Surface modification Nanocomposites Alumina |
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