Shear flow behavior and oil distribution between phases in thermoplastic vulcanizates

Krishnamurthy Jayaraman, Venkata Giri Kolli, Sang Yoon Kang, Sharad Kumar, Maria D. Ellul

    Research output: Research - peer-reviewArticle

    • 30 Citations

    Abstract

    The high rate shear flow behavior and the morphology of five different oil-extended polypropylene (PP)/ethylene-propylene-diene monomer (EPDM) thermoplastic vulcanizate blends were investigated with the melt flow rate (MFR) of the PP varying from 0.7 to 20. The ratio of rubber to PP is 70:30 in three of the thermoplastic vulcanizates (TPVs) and 50:50 in the other two TPVs. The distribution of the high-temperature oil between the PP melt and the rubber is a key parameter because this will affect the viscosity of the PP/oil medium. The object of this study was to estimate the matrix composition in each of the TPVs at processing temperatures and to compare the shear viscosity of the effective matrix with that of the TPV. To this end, several PP/oil mixtures were prepared and their viscosity curves were correlated with the neat PP melt viscosity curves by means of shift factors varying with oil concentration. The oil distribution between the PP and rubber phases was estimated from TEM micrographs of the TPV blends. The results show that the PPs are mixed with oil to different proportions in the different TPVs and the viscosity curves of these mixtures exhibit the same trends in magnitude as the corresponding TPV viscosity curves. Hence, the shear flow of TPVs can be understood more readily in terms of the effective PP/oil medium flow behavior than in terms of the neat PP melt flow.

    LanguageEnglish (US)
    Pages113-121
    Number of pages9
    JournalJournal of Applied Polymer Science
    Volume93
    Issue number1
    DOIs
    StatePublished - Jul 5 2004

    Profile

    Shear flow
    Thermoplastics
    Polypropylenes
    Oils
    Viscosity
    Rubber
    Temperature
    Shear viscosity
    Propylene
    Ethylene
    Monomers
    Flow rate
    Transmission electron microscopy
    Processing
    Chemical analysis
    ethylene-propylene-diene-monomer

    Keywords

    • Elastomers
    • Morphology
    • Polypropylene
    • Rheology
    • Swelling

    ASJC Scopus subject areas

    • Polymers and Plastics

    Cite this

    Shear flow behavior and oil distribution between phases in thermoplastic vulcanizates. / Jayaraman, Krishnamurthy; Kolli, Venkata Giri; Kang, Sang Yoon; Kumar, Sharad; Ellul, Maria D.

    In: Journal of Applied Polymer Science, Vol. 93, No. 1, 05.07.2004, p. 113-121.

    Research output: Research - peer-reviewArticle

    Jayaraman, Krishnamurthy ; Kolli, Venkata Giri ; Kang, Sang Yoon ; Kumar, Sharad ; Ellul, Maria D./ Shear flow behavior and oil distribution between phases in thermoplastic vulcanizates. In: Journal of Applied Polymer Science. 2004 ; Vol. 93, No. 1. pp. 113-121
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