Interfacial adhesion and mechanical properties of PMMA-coated CaCO₃ nanoparticle reinforced PVC composites

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• 作者：Xuehua Chen ; Chunzhong Li ; Shoufang Xu ; Ling Zhang ; Wei Shao ; H.L. Du
• 关键词：poly (vinyl chloride) ; polymethyl methacrylate ; calcium carbonate ; in situ polymerization ; nanoparticles ; nanocomposites
• 刊名：China Particuology
• 出版年：2006
• 出版时间：February 2006
• 年：2006
• 卷：4
• 期：1
• 页码：25-30
• 全文大小：419 K

文摘

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.