A Comparative Study of Morphology and Structure related Properties of Saturated Olefinic Thermoplastic Elastomer Blends of EPDM/PP/Oil and SEBS/PP/Oil

  • Sengupta, P. (Rubber Technology, Faculty of Chemical Technology, University of Twente) ;
  • Sengers, W.G.F. (Polymer Materials and Engineering, Faculty of Applied Sciences, Delft University of Technology) ;
  • Gotsis, A.D. (Polymer Materials and Engineering, Faculty of Applied Sciences, Delft University of Technology) ;
  • Noordermeer, J.W.M. (Rubber Technology, Faculty of Chemical Technology, University of Twente)
  • Published : 2003.03.31

Abstract

This work presents a comparative study of the morphology and structure related properties of thermoplastic elastomer blends based on SEBS/PP/Oil and dynamically vulcanized EPDM/PP/Oil. A combination of ruthenium oxide staining and low voltage scanning electron microscopy (LVSEM) was found to be suitable for the study of morphology of these highly oil extended blends. h close analogy was found in the mechanical, thermal and rheological properties of the two systems made in an internal Brabender mixer and co-rotating turin screw extruder. The morphology of the blends, as made by the two techniques, was found to be significantly different. In the case of TPVs, the blonds made in the extruder had smaller EPDM domains and better tensile properties. In the case of SEBS, the blends made in the Brabender had more co-continuous phases and showed better tensile properties. Crystallization behavior of the isotactic polypropylene in the blends was found to be influenced by the type of rubber. Blends of SEBS/PP crystallized at a lower temperature than the TPVs. These differences were probably caused by differences in the nucleating ability of the two rubbers.

References

  1. A. Y. Coran and B. Das and R Patel (to Monsanto Co.) U.S. 4, 130, 535 (1978)
  2. S. Abdou - Sabet and M. A. Fath (to Monsanto Co.) U.S. 4, 311, 628 (1982)
  3. G. M. Brown and J. H. Butler, 'New method for the characterization of domain morphology of polymer blends using ruthenium tetroxide staining and low voltage scanning electron microscopy', Polymer, 38, 3973 (1997) https://doi.org/10.1016/S0032-3861(96)00969-X
  4. LC Sawyer, DT Grubb, in 'Polymer microscopy ', London: Chapman & Hall, (1996)
  5. V. Dudler, M. C. Grob and D. Merian, 'Percolation network in polyolefins containing antistatic additive imaging by low voltage scanning electron microscop y', Polymer degradation and stability, 68, 373 (2000) https://doi.org/10.1016/S0141-3910(00)00021-5
  6. H. - J. Radusch and T. Pham, 'Morphology Formation in Dynamic Vulcanized PPIEPDM Blends' Kautsch. Gummi Kunsts., 49, 249 (1993)
  7. B. Ohlsson, H. Hassender and B. TomeIl, 'Blendsand thermoplastic interpenetrating polymer networks of polypropylene and polystyrene-block-poly(ethylenestst- butylene)-block-polystyrene triblock copolymer. I: morphology and structure related properties', Polym. Eng. Sci., 36, 501 (1996) https://doi.org/10.1002/pen.10436
  8. L. Dorazio, C. Mancarel!a, E. Martuscelli, G. Sticotti and R. Ghisel!ini, 'Thermoplastic Elastomers from iPPIEPR Blends: Crystallization and Phase Structure Development' J. Appl. Pol. Sci., 53, 387 (1994)
  9. G. l. Taylor, Proc. Royal Soc. London Ser. A, 138, 41 (1932)
  10. C. E. Scott and C. W. Macosko, 'Morphology development during the initial stages of polymer-polymer blending' Polymer, 36, 461 (1995)
  11. N. D. B. Lazo, and C. E. Scott, 'Morphology development during phase inversion of a PS/PE blend in isothermal, steady shear flow', Polymer, 40, 5469 (1999) https://doi.org/10.1016/S0032-3861(98)00792-7
  12. U. Sundarararaj, Y. Dori and C. W. Macosko, 'Sheet formation in immiscible polymer blends: model experiments on initial blend morphology' Polymer, 36, 1957 (1995)
  13. C. K. Shih, D. G. Tyanan, and D. A. Denelsbeck, 'Rheological Properties of multi component Polymer Systems undergoing Melting or Softening during Compounding Polym. Eng. Sci., 31, 1670 (1991)