the influence of crosslinked acrylonitrile-styrene-acrylate impact modifier on the mechanical and thermal properties of rigid poly(vinyl chloride)

Development of impact modifiers with the core-shell structure for enhancing toughness of rigid polymers such as poly (vinyl chloride) (pvc) has attracted a great deal of interest. in this study, crosslinked acrylonitrile-styrene-acrylate (asa) impact modifier with different core (poly(butyl acrylate)) contents was prepared by two-stage seeded emulsion polymerization. the prepared asa particles were then compounded with pvc using an internal mixer. the influence of asa particles with crosslinked poly(acrylonitrile-co-styrene) as the shell layer, and those with different core contents on impact strength of their blends with pvc were investigated. crosslinking of the shell layer in asa particles facilitated their well-distribution in pvc matrix and observed by sem images. this improved their impact resistance and heat distortion temperature (hdt) compared to those without any crosslinking. in addition, the izod results showed that asa particles with higher core content had higher impact strength.