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Effects Of Surface Modification Of Fumed Silica On Interfacial Structures And Mechanical Properties Of Poly(vinyl Chloride) Composites

S. Sun, C. Li, L. Zhang, H. Du, J. Burnell-Gray
Published 2006 · Materials Science

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Abstract Poly(vinyl chloride) (PVC)-based composites were prepared by blending PVC with nano-SiO 2 particles, which were treated with dimethyl dichlorosilane (DMCS), γ-methylacryloxypropyl trimethoxy silane (KH570). The dispersion and interfacial compatibility of nano-SiO 2 particles in PVC matrix was characterized by SEM, which indicated that DDS had a better dispersion and compatibility than UTS but worse than KHS. The mechanical properties, processability and effective interfacial interaction of nano-SiO 2 /PVC composites were studied. The nano-SiO 2 particles treated with KH570 or DMCS significantly reinforced and toughened the PVC composites. The maximum impact strength of PVC composites was achieved at a weight ratio of nano-SiO 2 /PVC:4/100. The tensile yield stress increased with increasing the content of treated inorganic particles. The incorporation of untreated nano-SiO 2 particles adversely affected the tensile strength of the composite. Although the equilibrium torques of all nano-SiO 2 /PVC composites were higher than that of pure PVC, the surface treatments did reduce the equilibrium torque. The interfacial interaction parameter, B , and interfacial immobility parameter, b , calculated respectively from tensile yield stress and loss module of nano-SiO 2 /PVC composites, were employed to quantitatively characterize the effective interfacial interaction between the nano-SiO 2 particles and PVC matrix. It was demonstrated that the nano-SiO 2 particles treated with KH570 had stronger effective interface interaction with PVC matrix than those treated with DMCS, which also had stronger effective interface interaction than the untreated nano-SiO 2 particles.
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