Preparation of PVC/CaCO3 nano-filler composite special for building material by in-situ polymerization
The in-situ suspension polymerization of vinyl chloride with nano-calcium carbonate was performed in 5 L autoclave to study the influences of nano-calcium carbonate on polymerization reaction and properties of product. It was observed that, with the addition of nanocalcium carbonate, the pressure of reaction system started to decrease earlier, and molecular weight and its distribution index of the obtained resin increased slightly. It was also found that the nanofiller didn＇t affect the glass transition temperature of the resin, but increased its thermal stability. Influences of nano-filler on the mean particle size and its distrbution of resin are not significant, but the oil absorption of filled resin increased. The mechanic properties of filled resin were also studied and the resutls showed that the impact strength of composites prepared by in-situ polymerization was twice as much as that of pure resin, and its tensile strength and break elongation ratio were better than that of blended resin.
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