Study on characterization and properties of nanosilica‐filled thermoplastic vulcanizates

Abstract

Thermoplastic vulcanizates (TPVs) are a special class of thermoplastic elastomer, produced by simultaneously mixing and cross-linking a rubber with a thermoplastic at elevated temperature. Dicumyl peroxide-cured TPVs based on blends of maleated ethylene propylene rubber (m-EPM) and polypropylene (PP) thermoplastic using maleated-PP as a compatibilizer have been developed. To reinforce the properties of these TPVs, nanosilica was added at different levels. With the increase of nanosilica concentrations, significant improvement in tensile strength, modulus, and impact strength of TPVs have been achieved. Morphology study shows that nanosilica is uniformly dispersed in the polymer matrices. Dynamic mechanical analysis shows that tan d value at low temperature decreases with increasing nanosilica concentration indicating less damping characteristics. Thermogravimetric study revealed that thermal stability of TPVs is improved in presence of nanosilica. Equilibrium swelling study confirms that solvent resistance of TPVs could be improved by nanofiller incorporation. Rubber process analyzer found a very useful tool to understand the melt rheology of nanosilica filled TPVs in terms of dynamic functions over a wide range of strain amplitude and frequency.

Effect of controlled electron beam irradiation on the rheological properties of nanosilica‐filled LDPE‐EVA based thermoplastic elastomer

“…Clearly, both unfilled and filled blends at both dose exhibit rheological behavior of the pseudo-plastic fluids. 9 Overall, upon irradiation, viscosity increases when compared with the unirradiated samples. The viscosity increases with the increase in the radiation dose.…”

“…Characterization and properties of nanosilicafilled thermoplastic vulcanizates were studied by Chatterjee and Naskar. 9 It was reported there that at low strain amplititude, the G 0 and G* of nanosilicafilled TPVs were higher than those of virgin TPVs. Both the storage and complex modulus increased further with increasing nanosilica concentrations.…”

Effect of dynamic crosslinking on phase morphology and mechanical properties of polyamide 6,12/ethylene vinyl acetate copolymer blends

“…Also, the processing conditions [12] as well as rheological and viscoelastic considerations related to the reactive melt blending process strongly affect the final properties [13]- [15]. Because of their unique characteristics, TPEs have very useful and attractive applications in a variety of markets, including the automotive, building and construction, and wires & cables industries [16]. Polyamide 6,12 (PA6,12) has excellent solvent and oil resistance, acid and alkali resistance, and excellent environmental stress cracking resistance at elevated temperatures [1], [17], [18].…”

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

“…They can be processed in a molten state as a thermoplastic polymer. Thermoplastic vulcanizates (TPVs), as a special case of TPEs, are produced via dynamic vulcanization of blends of a rubber and a thermoplastic polymer 1–3. Dynamic vulcanization is the procedure in which curing agents are used to crosslink an elastomer in situ during its mixing with molten plastics, which was first described by Gessler4 in 1962 and further developed by Fisher,5 Coran and Patel,6 and Sabet 7.…”