Modification Study Of PVC Blended With New MBS

Although PVC has been widely used, it has some shortcomings, such as: poor toughness, poor rheological behavior, thus it was restricted in the products field for high performance. Methyl methacrylate-Butadiene-styrene graft copolymer (MBS) with core-shell structure is a common toughening modifier on PVC. The size of core and composition of shell are thought to have close relationship with properties of the blends. Therefore, MBS with larger particle and containing new composition is blended with PVC, and Mico-structure and performance of the blends were investigated in this paper.The relationship between the properties of MBS/PVC blends and the microstructure of MBS was studied by electron microscope observation of MBS morphology, test of impact strength, tensile strength and dynamic mechanical analysis (DMA), The results show that the impact strength of PVC are significantly improved by blending with a small amount MBS-5, a new MBS with larger and uniform size, but the tensile strength of the blends has declined. by adding more MBS-4, another new MBS with uneven particle size, the impact strength of PVC have improved greatly, the tensile strength has a smaller decline. DMA show that with increasing the amount of MBS, storage modulus of the blends gradually declined, low-temperature glass transition moved to the high temperature area, the peak of tan8 is gradually increased, and the width of peaks narrowed. Based on the investigation of heat resistance and optical properties of the MBS/PVC blends,it is found that vicat softening temperature of the blends has a slight decrease and it dropped more for PVC/ MBS-5. Transparency of the two blends is increased, and the value of the haze decreased.A series of MBS resin were synthesized by adding new monomers. The rheological behavior impact toughness and dynamic mechanical properties of the PVC/MBS blends were studied by blending them with PVC resin. The results show that the blend containing larger amount of n-butyl acrylate and Butyl methacrylate exhibits better processing properties, notched-impact strength and lower storage modulus.