Mechanical and Rheological Behavior of Unvulcanized and Dynamically Vulcanized i‐PP/EPDM Blends

Abstract

The mechanical and rheological behavior of dynamically vulcanized PP/EPDM blends is examined and compared with those of unvulcanized blends. The effect of blend ratio and dynamic vulcanization of EPDM rubber on tensile properties and flow are investigated. The mechanical properties of the blends are strongly influenced by the blend ratio. With the increasing of EPDM content the value of yield stress in a solid state decreases with the elastomer volume fractions less than 0.45 for the unvulcanized blends. For the dynamically vulcanized blends the interval of EPDM content, at which the yield peak is seen, is rather limited below 0.25 elastomer volume fractions. It is shown that dynamic vulcanization changes the deformational behavior of PP/EPDM blends. The rheological properties of dynamically vulcanized blends depending on the ratio of the components may be similar to the properties of polymer composites containing the highly disperse structuring filler. The distinction between the rheological behavior of unvulcanized and dynamically vulcanized blends is related to differences of their structures and viscoelastic characteristics of unvulcanized and vulcanized EPDM phase.

Comparative study on mechanical, thermal, viscoelastic and rheological properties of vulcanised EPDM rubber

“…The effects of incorporation of different extends of carbon black as filler on some selected physical and mechanical properties, aging behaviour and conductivity of vulcanised EPDM based compounds and rheological behaviour EPDM rubber compounds in extrusion containing blowing agent have been reported by Ghosh and Chakrabarti 1 and Guriya et al 2 Prut et al 3 reported the effect of blend ratio and dynamic vulcanisation on tensile properties. The effects of carbon black filler, temperature and shear frequency on dynamic mechanical properties of EPDM elastomer and its carbon black compounds were investigated under sinusoidal shear flows by Osanaiye.…”

Rheological Behavior of Thermoplastic Vulcanizates

“…Rheological properties of iPP blended with oil‐extended EPDM are strongly determined by amount of oil and its distribution between EPDM and iPP phases. The viscosity of oil‐extended TPVs based, for example, on iPP‐2 and EPDM‐4535 decreases in comparison with that of oil‐free TPVs contained iPP‐2 and EPDM‐4044 5–7…”

“…The rheological properties were analyzed using capillary and parallel‐plate rheometers at 190 ° C 5–7. Dynamic frequency scan tests were conducted in the linear viscoelastic region.…”

“…The processing of TPVs is a function of their rheology. The rheological properties of the uncured and cured iPP/EPDM blends were examined by several authors 2–7. It was shown that rheology of these materials is determined by a number of parameters including molecular characteristics of the basic components.…”

Mechanical, vulcametric, and thermal properties of the different 5‐ethylidene 2‐norbornene content of ethylene‐propylene‐diene‐monomer vulcanized with different types and compositions of peroxides

“…There have been extensive studies on the mechanical, viscoelastic, and vulcametric properties of the EPDM,4–9 which contains different additives. Ginic‐Markovic et al5 studied the viscoelastic behavior of filled and unfilled EPDM.…”