Development of thermoplastic elastomers based on maleated ethylene propylene rubber (m-EPM) and polypropylene (PP) by dynamic vulcanization

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Abstract. Novel thermoplastic vulcanizates (TPVs) based on polypropylene (PP) and new generation ethylene-octene copolymer (EOC) have been developed by dynamic vulcanization process, which involves melt-mixing and simultaneously crosslinking a rubber with a thermoplastic. In this paper technologically compatibilized blends of PP and EOC were dynamically vulcanized by coagent assisted peroxide crosslinking system. The effect of structurally different types of peroxides, namely dicumyl peroxide, di-tert butyl peroxy isopropyl benzene and tert-butyl cumyl peroxide with varying concentrations on the properties on TPVs was mainly studied. The physico-mechanical, thermal and morphological properties of these TPVs were characterized by using X-ray diffraction (XRD), differential scanning calorimeter (DSC) and scanning electron microscopy (SEM).

Section: Introductionmentioning

confidence: 99%

Studies on the influence of structurally different peroxides in polypropylene/ethylene alpha olefin thermoplastic vulcanizates (TPVs)

Babu¹,

Singha²,

Naskar³

2008

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“…Recently, Naskar et al [13] have been involved in the development of a novel PP/EPDM TPVs by electron beam induced reactive processing. Special purpose TPVs based on silicone rubber [14] and maleated ethylene propylene rubber (m-EPM) [15] were also developed from the same lab. Lai et al [16] investigated the fracture behavior and physicomechanical properties of peroxide cured PP/EOC TPVs.…”

Section: Introductionmentioning

confidence: 99%

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Babu¹,

Singha²,

Naskar³

2010

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Abstract. Thermoplastic vulcanizates (TPVs) based on polypropylene (PP) with ethylene octene copolymer (EOC) and ethylene propylene diene rubber (EPDM) have been developed by coagent assisted dicumyl peroxide crosslinking system. The study was pursued to explore the influence of two dissimilar polyolefin polymers (EOC and EPDM) having different molecular architectures on the state and mode of dispersion of the blend components and their effects with special reference to morphological, thermal and mechanical characteristics. The effects of dynamic crosslinking of the PP/EOC and PP/EPDM have been compared by varying the concentration of crosslinking agent and ratio of blend components. The results suggested that the uncrosslinked and dynamically crosslinked blends of PP/EOC exhibit superior mechanical properties over PP/EPDM blends. From the hystersis experiments it was found that PP/EOC blends also perform better fatigue properties over PP/EPDM based blends. It was demonstrated that, the origin of the improved mechanical properties of EOC based blends is due to the combined effect of the unique molecular architecture with the presence of smaller crystals and better interfacial interaction of EOC phase with PP as supported by the results of thermal and fatigue analyses.

“…This technique has been employed in the development of several TPVs. Most of them are constituted by polypropylene as the thermoplastic component and different vulcanized rubbers dispersed in the polypropylene matrix, such as ethylene-propylene-diene rubber (EPDM) [14][15][16], nitrile rubber [17][18][19][20][21] and natural rubber [22,23], among others. However, to the best of our knowledge, there is no report in the accessible literature dealing with blends constituted by polypropylene and acrylic rubber.…”

Section: Introductionmentioning

confidence: 99%

A novel thermoplastic elastomer based on dynamically vulcanized polypropylene/acrylic rubber blends

Soares

Santos²,

Sirqueira³

2008

Abstract. Thermoplastic elastomer based on polypropylene (PP) and acrylic rubber (ACM) was investigated, with special attention on the compatibilization and dynamic vulcanization. ACM component contains chlorine and carboxyl groups along the backbone, which act as center for the curing and reactive compatibilization. The last event was carried out by adding a combination of maleic anhydride-modified PP (PP-g-MA) and triethylene tetramine (TETA), which act as interfacial agents between PP and ACM phases. The effectiveness of the compatibilization was suggested from mixing torque and viscosity, determined from rheological measurements. Outstanding mechanical performance, especially elongation at break, and better tensile set (lower values) were obtained with the compatibilization. The dynamic vulcanization also resulted in good mechanical properties for compatibilized blends, but the performance was inferior to that observed for non vulcanized blends. The effect of the compatibilization and/or dynamic vulcanization on the dynamic mechanical, thermal, morphological and stress relaxation properties was investigated.