Acrylate Copolymers With Core-shell Structure And Its Nanocomposites

The acrylate copolymers(ACR) with core-shell structure were synthesized by seed emulsion polymerization used with butyl acrylate, styrene, methylmethacrylate as comonomers.The emulsoid particle size and its distribution were determined by laser particle sizer. The composition changes of ACR were inspected by IR, and the core-shell structure was observed by TEM. The morphologyes of ACR resin particles were inspected by polarization microscope at last. The results showed that the ACR emulsoid particle size and its distribution can be adjusted by varying the amount of seed emulsion used in the pre-emulsionized seed-emulsion polymerization, and the ACR emulsoid particles have core-shell structure obviously.The properties of PVC/ACR blends, such as notched impact strength, tensile strength and flexural strength, were determined. SEM was employed to examine the fractured surfaces of PVC/ACR blends. The effects of the latex particle diameter and the proportion of PBA and crosslinking agent in ACR on mechanical properties of PVC/ACR blends were discussed. The results showed that the notched impact strength of PVC/ACR blends was improved remarkably and the tensile strength and the flexural strength of the blends have not obviously changed. The notched impact strength of PVC/ACR blends was increased to about 3 times more than the pure PVC when the ratio of PVC/ACR is 100/6(wt). So the ACR is an effective modifier for improving impact strength of PVC.The ACR/montmorillonite nanocomposites have been synthesized by insitu emulsion polymerization for the first time. The ACR/montmorillonite nanocomposites latex particle size and its distribution were determined by laser particle sizer. It is showed that the montmorillonite have been equably dispersed in the latex. The reactive force between montmorillonite and ACR in the ACR/montmorillonite nanocomposites were inspected by IR. The structures of the ACR/ montmorillonite nanocomposites were characterized by TEM and XRD. The intercalation mechanism of insitu emulsion polymerization has been proposed for the first time. Then ACR/montmorillonite nanocomposites blended with PVC, the TEM and XRD indicated that the montmorillonite were dispersed with nanometer in PVC matrix. The flexural strength and flexure modulus of composites increased with the montmorillonite content, and the impact strength of composites a little increased.