Siloxane Terpolymers as Compatibilizers for Polymer Blends

  • İskender Yilgör
  • Emel Yilgör
  • Joachim Venzmer
  • Roland Spiegler


Siloxane containing copolymers and graft terpolymers are used as compatibilizers for model immiscible polar/non polar blend systems. Compatibilizers generally consisted of a siloxane backbone containing various amounts of polyether and alkyl grafts with controlled molecular weights. Influence of structural and compositional variations and additive concentrations on the interfacial tensions of three, low molecular weight model blend systems, polyolefin/polyether, polypropylene/polyether and polypropylene/polyamide were measured by either the spinning drop or sessile drop methods. Stability of the dispersions and average sizes of the dispersed particles were also determined by optical microscopy. It has been shown that these types of siloxane graft terpolymers were more effective in reducing the interfacial tensions than conventional AB type block systems with no siloxane in their structures. Molecular design and architecture of the siloxane compatibilizers and a proper balance between non-polar and polar grafts played important roles in their efficiencies. Additives with longer siloxane backbone seemed to be more effective in reducing the interfacial tension. In polypropylene/polyether system a linear relationship between the reduction in the interfacial tension and the reduction in the average particle size of the dispersed phase was found. Dispersions formed were very stable even at fairly high processing temperatures.


Block Copolymer Interfacial Tension Graft Copolymer Polymer Blend Sessile Drop Method 
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  1. 1.
    L. A. Utracki, Polymer Alloys and Blends: Thermodynamics and Rheology, Hanser, Munchen (1989)Google Scholar
  2. 2.
    D. R. Paul, J. W. Barlow and H. Keskkula, Polymer Blends, in: Encycl. Polym. Sci. Eng., H. F. Mark, N. M. Bikales, C. G. Overberger and G. Menges, eds., John Wiley, New York (1987).Google Scholar
  3. 3.
    U. Sundararaj and C. W. Macosko, Drop Breakup and Coalescence in Polymer Blends-The Effects of Concentration on Compatibilization, Macromolecules, 28: 2647 (1995).CrossRefGoogle Scholar
  4. 4.
    C. W. Macosko, P. Guegan, A. Khandpur, A. Nakayama, P. Marechal and T. Inoue, Compatibilizers for Melt Blending: Premade Block Copolymers, Macromolecules, 29: 5590 (1996).CrossRefGoogle Scholar
  5. 5.
    D. R. Paul, Interfacial Agents for Polymer Blends, in: Polymer Blends, Vol. 2, Ch. 12, D. R. Paul and S. Newman, eds. Academic Press, New York (1978).Google Scholar
  6. 6.
    J. Noolandi and K. M. Hong, Interfacial properties of immiscible homopolymer blends in the presence of block copolymers, Macromolecules, 15: 482 (1982).CrossRefGoogle Scholar
  7. 7.
    M. Wagner and B. A. Wolf, Effect of block copolymers on the interfacial tension between two “immiscible” homopolymers, Polymer, 34: 1460 (1993).CrossRefGoogle Scholar
  8. 8.
    H. R. Brown, Effect of a diblock copolymer on the adhesion between incompatible polymers, Macromolecules, 22: 2859 (1989).CrossRefGoogle Scholar
  9. 9.
    C. Creton, E. J. Kramer and G. Hadziioannu, Critical molecular weight for block copolymer reinforcement of interfaces in a two-phase polymer blend, Macromolecules. 24: 1846 (1991).CrossRefGoogle Scholar
  10. 10.
    C. Creton, E. J. Kramer, C. -Y. Yui and H. R. Brown, Failure mechanisms of polymer interfaces reinforced with block copolymers, Macromolecules, 25: 3075 (1992).CrossRefGoogle Scholar
  11. 11.
    Y. Lyatskaya, D. Gersappe and A. C. Balazs, Effect of Copolymer Architecture on the Efficiency of Compatihilizers, Macromolecules, 28: 6278 (1995).Google Scholar
  12. 12.
    Y. Lyatskaya, S. H. Jacobson and A. C. Balazs, Effect of Composition on the Compatibilizing Activity of Comb Polymers, Macromolecules, 29: 1059 (1996).Google Scholar
  13. 13.
    R. Israels, D. P. Foster and A. C. Balazs, Designing Optimum Comb Compatibilizers: AC and BC Combs at an A/B Interface, Macromolecules, 28: 218 (1995).Google Scholar
  14. 14.
    B. Lowenhaupt and G. P. Hellmann, Interface stabilization and micelle formation in blends with a block copolymer, Coll. Polym. Sci. 268: 885 (1990).Google Scholar
  15. 15.
    K. R. Shull, E. J. Kramer, G. Hadziioannu and W. Tang, Segregation of block copolymers to interfaces between immiscible homopolymers, Macromolecules, 23: 4780 (1990).Google Scholar
  16. 16.
    K. H. Dai, E. J. Kramer and K. R. Shull, Interfacial segregation in two-phase blends with diblock copolymer additives: The effect of homopolymer molecular weight, Macromolecules, 25: 220 (1992).CrossRefGoogle Scholar
  17. 17.
    T. A. Vilgis and J. Noolandi, Theory of homopolymer-block copolymer blends. The search for a universal compatibilizer, Macromolecules, 23: 2941 (1990).Google Scholar
  18. 18.
    H. Eklind, S. Schantz, F. H. J. Maurer, P. Jannasch and B. Wesslen, Characterization of the Interphase in PPO/PMMA Blends Compatibilized by P(S-g-EO), Macromolecules, 29: 984 (1996).Google Scholar
  19. 19.
    E. Esselborn and J. Fock, U. S. Patent, 4,618, 457 (1986).Google Scholar
  20. 20.
    I. Yilgor and J. E. McGrath, Polysiloxane containing copolymers: A survey of new developments, Adv. Polym. Sci. 86: 1 (1988).CrossRefGoogle Scholar
  21. 21.
    I. Yilgor, W. P. Steckle, E. Yilgor, R. G. Freelin and J. Riffle, Novel triblock siloxane copolymers: Synthesis, characterization and their use as surface modifying additives, J Polym. Sci., Polym. Chem. A27: 3673 (1989).Google Scholar
  22. 22.
    B. Vonnegut, Rotating bubble method for the determination of surface and interfacial tensions, Rev. Sci. lnstr. 13: 6 (1942).Google Scholar
  23. 23.
    H. M. Princen, I. Y. Z. Zia and S. G. Mason, Measurement of interfacial tension from the shape of a rotating drop, J. Coll. Interf Sci. 23: 99 (1967).CrossRefGoogle Scholar
  24. 24.
    A. W. Adamson, Physical Chemistry of Surfaces, John Wiley, New York (1990).Google Scholar
  25. 25.
    Y. Rotenberg, L. Boruvka and A. W. Neumann, Determination of surface tension and contact angle from the shapes of assyinmetric fluid interfaces, J. Coll. Intel!. Sci. 93: 169 (1983).Google Scholar
  26. 26.
    A. W. Porter, The calculation of surface tension from experiment - Part 1. Sessile drop, Phil. Mag. 15: 163 (1933).Google Scholar
  27. 27.
    S. Wu, Formation of dispersed phase in incompatible polymer blends: Interfacial and rheological effects, Polym. Eng. Sci. 27: 335 (1987).Google Scholar
  28. 28.
    Y. Shibata, Resin compositions containing novel compatibilizers for good impact resistance, Jpn. Kokai Tokkyo Koho, JP 04025565; CA 117:9183d.Google Scholar

Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • İskender Yilgör
    • 1
  • Emel Yilgör
    • 1
  • Joachim Venzmer
    • 2
  • Roland Spiegler
    • 2
  1. 1.Koç Universityİstinye İstanbulTurkey
  2. 2.Th. Goldschmidt AGEssenGermany

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