Thermoplastic vulcanizates (TPVs) based on high-impact polystyrene (HIPS)/styrenebutadiene rubber (SBR) blends were prepared by dynamic vulcanization technique, and the TPVs were compatibilized by styrene-butadiene-styrene block copolymer (SBS). Experimental results indicate that SBS had a good compatibilization effect on the HIPS/SBR TPVs. A rubber process analyzer reveals that elastic modulus increased with increasing frequency and increasing SBR content in the TPVs led to obvious decrease in elastic modulus. A softening phenomenon could be observed in the stress-stretch curves of HIPS/SBR and HIPS/SBS/SBR TPVs during the uniaxial loading-unloading cycles. Compatibilized HIPS/SBR TPV had the relatively lower stress and internal friction loss.
Thermoplastic vulcanizates (TPVs) based on high impact polystyrene (HIPS)/high vinyl polybutadiene rubber (HVPBR) composites were prepared by dynamic vulcanization, and then compatibilized by styrene–butadiene–styrene (SBS) block copolymer. The effects of SBS compatibilizer on mechanical properties, Mullins effect, morphological and dynamic mechanical properties of the TPVs were investigated systematically. Experimental results indicated that SBS had an excellent compatibilization effect on the dynamically vulcanized HIPS/HVPBR composites. Compared with those of HIPS/HVPBR composite, the tensile strength, elongation at break and tearing strength of HIPS/HVPBR composite with 12 phr SBS incorporation were improved by about 163%, 312% and 67%, respectively. Mullins effect results showed that the compatibilized HIPS/HVPBR TPVs had relatively lower residual deformation and internal friction loss than those of HIPS/HVPBR composites, indicating the improvement of elastic reversibility. Morphology studies showed that the interface interaction of the TPVs was enhanced and the particle sizes of the dispersed phase were decreased with the incorporation of SBS compatibilizer. Dynamic mechanical analysis studies showed that the Tg s of HIPS and HVPBR phases were slightly shifted toward low temperature with the incorporation of SBS, which indicates the significant improvement of the compatibility.
Thermoplastic vulcanizates (TPVs) based on acrylonitrile–butadiene–styrene terpolymer (ABS)/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization where ABS matrix was plasticized by dioctyl phthalate (DOP), and the influences of DOP plasticizer dosage on mechanical properties, Mullins effect, and morphological properties of the TPVs were investigated systematically. Experimental results indicated that the mechanical properties of ABS/NBR TPVs were improved significantly with the incorporation of DOP. Compared with ABS/NBR TPVs, the tensile strength and the elongation at break went through maximum values at a plasticizer content of 10 phr, while the Shore A hardness was decreased apparently. Mullins effect results showed that the TPVs incorporated with DOP had relatively lower stress-softening effect, residual deformation, and internal friction loss than that of the ABS/NBR TPVs, indicating the improvement of elasticity. Morphology studies showed that the fracture surface of ABS/NBR/DOP TPVs was relatively smoother, indicating the significantly improved elastic resilience ability.
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