Study On The Synthesis Of Copolyermer With Core-Shell Structure And It's Modification To Polyvinyl Chloride By Blending

The nano-CaCO3 was treated with isopropyl trioleoyl titanate (T-1) and isopropyl diacryloyl stearic titanate (T-2) respectively via wet route in this thesis firstly. The grafting value of titanate and the main parameters of treatment were studied systematically also. The results show that the two kinds of titanate coupling agents can be grafted onto the surface of inorganic particles through the chemical band. This research hasn't been reported by other researchers recently.Nano-CaCO3/PBA/PMMA and nano-CaCO3/PBA/P(MMA-St) complex latices with core-shell structure were prepared by seeded emulsion polymerization successfully in this thesis. The size and distribution, the morphological structures of latex were determined through dynamic laser scattering and TEM. The influence of synthetic factors on the emulsion polymerization and the complex latex size were discussed. The property studies of nanocomposites show the leading of inorganic nanoparticles advantages increasing the thermostability of composites. The investigation to nano-CaCO3/PMMA composites shows the grafting value and grafting efficiency of polymer on the surface of inorganic nanoparticles increased highly because titanate can strengthen the interface reaction greatly.The blends of polyvinyl chloride (PVC) and nanocomposites were prepared by blending method. The mechanical property, thermal property, Vicat softening temperature, rheological property, morphological structure and the broken profile of the blends, were determined and characterized with the aid of DMA, TA-2000 type thermal analyzer, XWB-300F type detector of Vicat softening temperature, capillary rheometer, TEM and SEM, respectively. The results show that nanocomposites can be uniformly dispersed in the PVC matrix at nanometer scale, and that the impact toughness of blends has been enhanced dramatically. When the addition portion of nanocomposites is 8 portions and the treated agent is titanate T-2, the notched impact strength of blend increases by 3 times and its tensile strength rises in some sort when using nano-CaCO3/PBA/PMMA as modifier; the notched impact strength of blend increases by 4 times and its tensile strength doesn't change when using nano-CaCO3/PBA/P(MMA-St) as modifier. Comparing the modifying effect of nanocomposites which prepared by nano-CaCO3 treated withdifferent treated agent on PVC resin, one can find titanate is good than stearic acid. The reason may be that the nano-CaCO3 particle and elastic polymer are cohered tightly through the "bridging" effect of titanate coupling agent, which is favor to the toughening synergism of inorganic nanoparticles and elastic mass displaying effectively. The thermal stability and Vicat softening temperature of blends rise at certain degree also.