Interfacial Morphology and Autohesion of A-B-A Triblock Copolymers

  • D. H. Kaelble
  • E. H. Cirlin
  • M. Shen
Conference paper


The tensile-recovery response, optical transparency, and autohesion properties of an A-B-A triblock copolymer where A is polystyrene and B is polybutadiene have been analyzed in terms of the interfacial mechanisms of reversible bonding. This study indicates that cavitation and void formation accompanies the characteristic initial yielding and cold drawing of this polymer system. Tensile stress-strain curves are described by a theoretical function that defines both the loss and regain of interfacial continuity between the continuous B phase and the discrete A phase domains. The study indicates the initially formed cavities act as light scattering centers. Under prolonged tensile stress these cavities coalesce to produce visible void structures. Both types of defects disappear after sufficient recovery time to regenerate the original optical and mechanical response of the undeformed material.


Triblock Copolymer Peel Testing Centrifugal Casting Interfacial Morphology Cold Drawing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. F. Beecher, L. Marker, R. D. Bradford and S. L. Aggarwal, J. Poly-Sci., Part C, No. 26, 117 (1969).CrossRefGoogle Scholar
  2. 2.
    D. M. Brunwin, E. Fischer, and J. F. Henderson, Ibid., 135 (1969).Google Scholar
  3. 3.
    L. Mullins, J. Rubber Res., 16, 275 (1947).Google Scholar
  4. 4.
    D. H. Kaelble, J. Appl. Poly. Sci. 9, 1209 (1965).Google Scholar
  5. 5.
    K. Yagii and N. W. Tscheogl, Second Annual Report, Contract Number F0U6ll-67-C-0057, AFRPL-TR-69-I8O, California Institute of Technology, August 1969, pp. V-9.-Google Scholar
  6. 6.
    E. J. Meehan, J. Poly. Sci., 1, 175 (1946).CrossRefGoogle Scholar
  7. 7.
    J. G. Calvert and J. N. Pitts, Jr., Photochemistry, Wiley, New York, 1966, p.Google Scholar
  8. 8.
    L. R. G. Treloar, Physics of Rubber Elasticity, 2nd Edition, Clarendon Press, Oxford 1958.Google Scholar
  9. 9.
    R. F. Landel and R. F. Fedors, “Fracture Processes in Polymeric Solids” (Editor: B. Rosen) Chap. 3-B, Wiley-Interscience, New York (196k).Google Scholar
  10. 10.
    D. H. Kaelble, Physical Chemistry of Adhesion, Chapter 11 Wiley, New York (1970) in production.Google Scholar
  11. 11.
    D. H. Kaelble, “Interfacial Morphology and Mechanical Properties of A-B-A Triblock Copolymers”, Presented before Society of Rheology, Pasadena, Feb. 1970, to be published in Trans. Soc. Rheol.Google Scholar

Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • D. H. Kaelble
    • 1
  • E. H. Cirlin
    • 1
  • M. Shen
    • 2
  1. 1.Science CenterNorth American Rockwell CorporationThousand OaksUSA
  2. 2.Dept. of Chem. Eng.University of CaliforniaBerkeleyUSA

Personalised recommendations