Rheological, mechanical and morphological properties of thermoplastic vulcanizates based on high impact polystyrene and styrene‐butadiene rubber

Abstract

Thermoplastic vulcanizates (TPVs) based on high impact polystyrene (HIPS)/styrene-butadiene rubber (SBR) blends were prepared by dynamic vulcanization technique. The rheological, mechanical and morphological properties of the dynamically vulcanized blends were investigated systematically. As determined by capillary rheometer, the apparent viscosity of the blends decreases as the shear rate increases, indicating obvious pseudoplastic behavior. At low shear rate, the apparent viscosity of these blends is considerably higher than that of neat HIPS and decreases with the increase of HIPS concentration. The increase of HIPS content in the dynamically vulcanized blends contributes to the increase of tensile strength and hardness properties, while elongation at break and tensile set at break reach a maximum at 30 and 50 wt % of the HIPS content, respectively. The etched surfaces of the HIPS/SBR TPVs were investigated using field-emission scanning electron microscopy, the morphological study reveals continuous HIPS phase and finely dispersed SBR elastomeric phase in the TPVs.

Anion exchange membranes based on semi-interpenetrating polymer network of quaternized chitosan and polystyrene

“…The results indicate that the formation of the semi-IPN structure benefits the mechanical strength of the membranes. However, the increased percent of the PS results in the decreased elongation at break of the membranes as PS is less flexible and similar result has been reported [42,43].…”

Strengthening effect of Mullins effect of high- density polyethylene/ethylene–propylene–diene terpolymer thermoplastic vulcanizates under compression mode

“…Normally, the mechanical strength of the TPVs was mainly determined by the matrix resin. 24 When TPV was subjected to a compressive stress for the first time, the plastic deformation of HDPE matrix would generate and result in the large energy consumption and relatively high residual deformation, as shown in Figure 7(b). When the external force was removed, the plastic deformation of TPV during the compression process could only partially recover and the residual deformation would be accumulated with increasing loading–unloading cycles.…”

Polystyrene/Recycled Sbr Powder Compounds Produced in An Internal Batch Mixer

“…Adhikari et al [9] also showed that rubber particle surface treatment can improve compound properties, while increasing particle size will make them worse. Wang et al [10] produced a TPV from high-impact polystyrene (HIPS) and styrene-butadiene rubber (SBR). The unvulcanized SBR compound was dispersed in HIPS using a two-roll mill mixer and SBR vulcanization was performed during compounding.…”