Citation: Jing-zhi Zheng a, b, Xing-ping Zhou a, Ji-ru Ying a, Xiao-lin Xie a, Yiu-wing Mai c. ENHANCED MECHANICAL PROPERTIES OF POLYPROPYLENE/SILICA NANOCOMPOSITES WITH SURFACE MODIFICATION OF NANO-SILICA VIA IN SITU COPOLYMERIZATION OF METHYL METHACRYLATE AND BUTYL ACRYLATE[J]. Chinese Journal of Polymer Science, ;2009, 27(5): 685-694. shu

ENHANCED MECHANICAL PROPERTIES OF POLYPROPYLENE/SILICA NANOCOMPOSITES WITH SURFACE MODIFICATION OF NANO-SILICA VIA IN SITU COPOLYMERIZATION OF METHYL METHACRYLATE AND BUTYL ACRYLATE

Received Date: 2 July 2008
Revised Date: 29 August 2008

Nano-sized silica particles were modified with methacryloxy-propyltrimethoxysilane (MPS) followed by in situ copolymerization of methyl methacrylate (MMA) and butyl acrylate (BA). These modified nanoparticles were compounded with polypropylene (PP) to prepare PP/silica nanocomposites. PMMA grafted on nano-silica enhances the dispersion of the nanoparticles and interfacial adhesion, decreases the size of PP spherulites in nanocomposites and leads to increasing the Young’s modulus and toughness of PP/silica nanocomposites at the same time. PBA grafted on nano-silica further improves the dispersion and the interfacial interaction, decreases the size of PP spherulites in PP/silica nanocomposite and leads to further toughening the PP/silica nanocomposite. But, its low modulus decreases the modulus of the PP/silica nanocomposite. The nanocomposites with PP and nano-silica particles modified by P(MMA-co-BA) have balanced stiffness and toughness due to the moderate modulus and solubility parameter of P(MMA-co-BA).
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