Toughness, dynamic mechanical property, and morphology of polyvinylchloride/acrylonitrile-styrene-butyl acrylate blends

Abstract

Acrylonitrile‐styrene‐butyl acrylate (ASA) graft copolymers with different acrylonitrile (AN) contents, the core‐shell ratio, and tert‐dodecyl mercaptan (TDDM) amounts were synthesized by seed emulsion polymerization. Polyvinylchloride (PVC)/ASA blends were prepared by melt blending ASA graft copolymers with PVC resin. Then the toughness, dynamic mechanical property, and morphology of the PVC/ASA blends were investigated. The results indicated that the impact strength of the PVC/ASA blends increased and then decreased with the increase of the AN content in poly(styrene‐co‐acrylonitrile (SAN) copolymer, and increased with the increase of the core‐shell ratio of ASA. It was shown that brittle‐ductile transition of PVC/ASA blends was dependent on poly(butyl acrylate) (PBA) rubber content in blends and independent of AN content in SAN copolymer. The introduction of TDDM made the toughness of PVC/ASA blends poor. Dynamic mechanical analysis (DMA) curves exhibited that PVC and SAN copolymers were immiscible over the entire AN composition range. From scanning electron microscopy (SEM), it was found that the dispersion of ASA in PVC/ASA blends was dependent on the AN content in SAN copolymer and TDDM amounts. J. VINYL ADDIT. TECHNOL., 22:43–50, 2016. © 2014 Society of Plastics Engineers

Effect of core–shell structures of acrylonitrile–styrene–acrylate (ASA) terpolymer on the properties of poly(vinyl chloride) (PVC)/ASA blends: Miscibility, toughness, and heat resistance

“…For example, the fibrillar/root‐like structures for PVC/ASA (60 wt % PBA content, 23 °C) is in sharp contrast with that relatively smooth morphology of neat PVC (23 °C). It is well known that, under the condition of impact load, the effective toughening agents (rubber/elastomer component) will work as the stress concentrator to induce severe distortion and thereby exhibit coarse and distorted morphology (i.e., root‐like structure caused by shield yielding); while the brittle materials will usually exhibit a clear‐ and smooth‐cut surface morphology. All the morphological results are consistent with the impact strength results, suggesting the good structure–properties relationship.…”

Acrylonitrile-Styrene-Acrylate Particles with Different Microstructure for Improving the Toughness of Poly(styrene-co-acrylonitrile) Resin

“…Tian et al [22] investigated that ASA particles with 60 wt% PBA rubber core were the most suitable impact modifier for SAN resin, since it exhibited a good balance between toughness and rigidity. Furthermore, the influence of ASA particle addition amount, degree of crosslinking, and many other factors were fully discussed in others' work [23][24][25][26]. However, the effect of the microstructure of ASA particles on the toughening effect has not been thoroughly explored.…”