The difference between apparent grafting ratio and true grafting ratio in bulk graft copolymerization of styrene onto rubber and the change of rubber particle size during the overall polymerization processes were stud...The difference between apparent grafting ratio and true grafting ratio in bulk graft copolymerization of styrene onto rubber and the change of rubber particle size during the overall polymerization processes were studied. The results show that, the apparent grafting ratio increased mutationally at the phase inversion and trended to level off after the phase inversion, but the true grating ratio increased gradually with the increase of conversion. At the same time, the particle size of rubber phase in the original polymerizing mixtures almost kept constant after the phase inversion. On the contrary, the size increased with the increase of conversion when the samples were dealt with multi-solution-centrifugation.展开更多
MMT emulsion after sonication was blended with polymer latex.Polymer/MMT nano-composite coating was formed by simply evaporating water, just like the case of conventional emulsion coating.Polymer/MMT nano-structured f...MMT emulsion after sonication was blended with polymer latex.Polymer/MMT nano-composite coating was formed by simply evaporating water, just like the case of conventional emulsion coating.Polymer/MMT nano-structured film could be formed by this colloidal packing method. Tensile strength and modulus of the films dramatically increased with increasing of MMT content up to 10%(mass). Polar functional groups introduced on the surface of the polymer particles were found to enhance tensile strength. These polar functional groups also played a key role in controlling the morphology of nano-structured films, leading to the dependence of modulus of the films on the types of functional groups.展开更多
文摘The difference between apparent grafting ratio and true grafting ratio in bulk graft copolymerization of styrene onto rubber and the change of rubber particle size during the overall polymerization processes were studied. The results show that, the apparent grafting ratio increased mutationally at the phase inversion and trended to level off after the phase inversion, but the true grating ratio increased gradually with the increase of conversion. At the same time, the particle size of rubber phase in the original polymerizing mixtures almost kept constant after the phase inversion. On the contrary, the size increased with the increase of conversion when the samples were dealt with multi-solution-centrifugation.
文摘MMT emulsion after sonication was blended with polymer latex.Polymer/MMT nano-composite coating was formed by simply evaporating water, just like the case of conventional emulsion coating.Polymer/MMT nano-structured film could be formed by this colloidal packing method. Tensile strength and modulus of the films dramatically increased with increasing of MMT content up to 10%(mass). Polar functional groups introduced on the surface of the polymer particles were found to enhance tensile strength. These polar functional groups also played a key role in controlling the morphology of nano-structured films, leading to the dependence of modulus of the films on the types of functional groups.
