Effect of Nano-SiO2 on Granule Characteristic and Fusion Process of Poly(vinyl chloride-co-vinyl acetate)/Nano-SiO2 Composite Resin

摘要

Poly(vinyl chloride-co-vinyl acetate) (PVVA)ano-SiO2 composite resin was prepared by radical suspension polymerization of the monomers in the presence of fumed nano-SiO2 particles premodified with gamma-methylacryloxypropyl trimethoxysilane. The cool dioctyl phthalate absorption percentage, granule porosity, and specific surface area of the composite resin were enhanced through incorporation of nano-SiO2 into the PVVA. Scanning electron microscope pictures showed the resin had higher porosity. PVVAano-SiO2 composite resin was mixed with pure PVC resin to form a mixture sample (polymer-composite blend [PCB]) and the mixture was fused in the torque rheometer. The rheological test results indicated that, at a certain nano-SiO2 content, the fusion speed of PCB was accelerated and the fusion temperature of PCB was decreased, owing to nano-SiO2 dispersed evenly in the polymer matrix. When excessive nano-SiO2 was loaded, the fusion torque, the fusion time, and the fusion temperature of PCB were all increased. These properties are correlative to the dispersive density of nano-SiO2 in the polymer matrix. This study also demonstrated that the introduction of small amounts of nano-SiO2 into the resin increased the impact strength and tensile strength of PCB simultaneously. (c) 2014 Society of Plastics Engineers