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: Contribution to journalArticle

  • 31 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

Polypropylenes
Shear flow
Thermoplastics
Oils
Viscosity
Rubber
Shear viscosity
Propylene
Ethylene
Monomers
Flow rate
Transmission electron microscopy
Temperature

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: Contribution to journalArticle

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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