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INTERFACIAL ADHESION AND MECHANICAL PROPERTIES OF PMMA-COATED CaCO₃ NANOPARTICLE REINFORCED PVC COMPOSITES

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

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Chunzhong Li

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Advanced Materials Research Institute, Northumbria University, Newcastle upon Tyne NE1 8ST, United Kingdom

Author to whom correspondence should be addressed. Tel: 0086-21-64250949, Fax: 0086-21-64250624.

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Shoufang Xu

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

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Ling Zhang

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

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Wei Shao

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

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, and

H. L. Du

Advanced Materials Research Institute, Northumbria University, Newcastle upon Tyne NE1 8ST, United Kingdom

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Abstract

Polymethyl methacrylate (PMMA)-coated nano-CaCO₃ particles were prepared by in-situ emulsion polymerization. The mechanical properties of nano-CaCO₃ particles-reinforced PVC were investigated using an AG-2000A universal testing machine and an XJU-2.75 izod impact tester; interfacial adhesion between CaCO₃ nanoparticles and PVC matrix by SEM, and structure of PMMA coated on the surface of CaCO₃ by FTIR and ¹H-NMR. The results indicate that the PMMA coated on the nano CaCO₃ particles consists mainly of syndiotactic structure, and their three tacticity contents were rr 52.8%, mm 7.3% and mr 39.9%, respectively. The interfacial adhesion between CaCO₃ nanoparticles and PVC matrix was significantly improved when the CaCO₃ nanoparticles were coated with PMMA, which led to increased Young's moduli and tensile strengths of the PMMA-coated CaCO₃/PVC composites. The izod impact strengths of the composites were strongly affected by the PMMA coating thickness and increased significantly with increasing the volume fraction of CaCO₃ filler in the composites.

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