Abstract
Four samples of star-shaped styrene–butadiene block copolymers were prepared by anionic polymerization. Samples have been characterized in terms of molecular weight, molecular weight distribution and coupling ratio (number of branches per molecule). Films of the samples were prepared by casting from cyclohexane and 9:1 tetrahydrofuran (THF)/methyl ethyl ketone (MEK) mixture. The morphology, and mechanical and dynamic viscoelastic properties have been examined in solid state. The morphology of the films of the radial block copolymers is affected by the primary chain structures, molecular weight and casting solvent. The mechanical and dynamic viscoelastic properties of the films are characteristic of the morphology. The relations among primary chain structure, morphology and viscoelastic properties are discussed in detail on the basis of the experimental results.
Similar content being viewed by others
Log in or create a free account to read this content
Gain free access to this article, as well as selected content from this journal and more on nature.com
or
References
G. E. Molau, “Block Polymers,” S. L. Aggarwal, Ed., Plenum Press, New York, N. Y., 1970.
D. J. Meier, “Block and Graft Copolymers,” J. J. Burke and B. Weiss, Ed., Syracuse Univ. Press, New York, N. Y., 1973.
C. Sadron and B. Gallot, Macromol Chem., 164, 301 (1973).
J. F. Beecher, L. Marker, R. D. Bradford, and S. L. Aggarwal, J. Polym. Sci., C, 26, 117 (1969).
T. Miyamoto, K. Kodama, and K. Shibayama, J. Polym. Sci., A-2, 8, 2095 (1970).
A. Beamish, R. A. Gordberg, and D. J. Hourston, Polymer, 18, 49 (1977).
G. H. Hsiue, M. Y. M. Ma, Polymer, 25, 882, (1984).
J. Diamant, D. Soong, and M. C. Williams, Polym. Eng. Sci., 22, 673 (1982).
T. Masuda, K. Kitamura, and S. Onogi, J. Soc. Rheol., Jpn., 8, 123 (1980).
F. S. Bates, R. E. Cohen, and A. S. Argon, Macromolecules, 16, 1108 (1983).
C. Price, A. G. Watson, and M. T. Chow, Polymer, 13, 333 (1972).
E. Pedemonte, G. Dondero, F. de Candia, and G. Romano, Polymer, 17, 72 (1976).
L. K. Bi and L. J. Fetters, Macromolecules, 8, 90 (1975).
L. K. Bi and L. J. Fetters, Macromolecules, 9 732 (1976).
D. B. Alward, D. J. Kinning, E. L. Thomas, and L. J. Fetters, Macromolecules, 19, 215 (1986).
D. J. Kinning, E. L. Thomas, D. B. Alward, L. J. Fetters, and D. L. Handlin, Jr., Macromolecules, 19, 1288 (1986).
E. L. Thomas, D. B. Alward, D. J. Kinning, D. C. Martin, D. L. handlin, Jr., and L. J. Fetters, Macromolecules, 19, 2197 (1986).
H. L. Hsieh, J. Polym. Sci., 3, 181 (1965).
L. Leibler, Macromolecules, 13, 1602 (1980).
E. Helfand and Z. R. Wasserman, “Developments in Block Copolymers,” I. Goodman, Ed., Applied Science Publishers, Ltd., London, 1982.
A. Khokhlov, Polymer, 22, 447 (1981).
J. Roovers, N. Hadjichristidis, and L. J. Fetters, Macromolecules, 16, 214 (1983).
M. O. de la Cruz and I. C. Sanchez, Macromolecules, 19, 2501 (1986).
A. B. Nguyen, N. Hadjichristidis, and L. J. Fetters, Macromolecules, 19, 768 (1986).
S. Akiyama, Kobunshi, 29, 819 (1980).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Takigawa, T., Ohta, Y., Ichikawa, S. et al. Morphology and Viscoelastic Properties of Star-Shaped Styrene–Butadiene Radial Block Copolymers. Polym J 20, 293–305 (1988). https://doi.org/10.1295/polymj.20.293
Issue date:
DOI: https://doi.org/10.1295/polymj.20.293
