Study On Modification Of Polyvinyl Chloride Hybridized With Organized Filler And Rubber Elastomer

The composite materials were prepared with vulcanized acrylonitrile butadiene rubber (NBR) / poly (vinyl chloride) ( PVC) blended with the hard argil filler treated by silicane coupling agent KH550, its strength at break is 20.5MPa and elongation at break is 380%. To investigate the composite mechanism of argil filler/vulcanized NBR/PVC , thermoanalysis , infra-red spectra ( IR ) , scanning electron microscope (SEM) were used to characterize the structure and properties of the composite. It has been found that argil filler treated with coupling agent can be chemically reacted with polymer matrix through IR analysis. In SEM image of fracture surface of the composite, it is observed that argil filler treated by silicane coupling agent combined with polymer matrix very well.Ifs because the compatibility between argil and polymer is improved with silicane coupling agent.Furthermore , argil filler , rubber and PVC combined one another better with vulcanization than without vulcanization , because the multiphase compatibility among argil filler, rubber and PVC is improved by the vulcanization processing. Thermoanalysis results showed that the silicane coupling agent and vulcanization also affected greatly glass transition temperature and decomposition temperature of the composite.The composite of PVC and ionomer based on anhydride-g-butadiene rubber (MAH-g-BR) /zinc stearate system were prepared by blend.The strength at break of the composite of PVC and ionomer is 50% higher than that of BR/PVC.The elongation at break of the composite of PVC and ionomer is 30% higher than that of BR/PVC. It is because the compatibility between MAH-g-BR and PVC has been greatly improved, moreover, the strength of BR is enhanced by ionic crosslinking.Infra-red spectra also proved that the macromolecule of BR had been graftedsuccessfully with MAH , and moreover, the acid anhydride groups of MAH-g-BR had neutralized with zinc cation.Powdered styrene-butadiene rubber ( PSBR ) was prepared by adding the cncapsulator and aparting agent to styrene-butadiene emulsion by coacervation. A Coron resin (consist of 70wt% styrene and 30wt% maleic anhydride ) was used as the encapsulator of SBR emulsion particles and the ultrafine calcium carbonate used as aparting agent in coacervation. Adding 9wt% Coron resin and 50 ~ 70wt% ultrafine calcium carbonate to styrene-butadiene emulsion , the particle size of PSBR after coacervation was less than 1mm and had good properties; The modified PSBR was prepared by the grafting copolymerization with adding 30wt% methyl methacrylate and 1.0wt% crosslink agent. The strength at break of the modified PSBR/PVC is 25% higher than that of PSBR/PVC. The notched impact strength of modified PSBR/PVC is 2.5 times higher than that of PSBR/PVC.Adding 8 ~ 12wt% nano-montmorillonite to styrene-butadiene emulsion grafted with methyl methacrylate, the powdered rubber was prepared by coacervation.The properties of PVC can be improved greatly by blending with this powder rubber; The modified PSBR was prepared by the grafting polymerization with adding 25wt% methyl methacrylate and 1.2wt% crosslink agent. The strength at break of the modified PSBR/PVC is 20% higher than that of PSBR/PVC.The notched impact strength of modified PSBR/PVC is 2 times higher than that of PSBR/PVC.