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A New Class of Polymers: Starburst-Dendritic Macromolecules


This paper describes the first synthesis of a new class of topological macromolecules which we refer to as “starburst polymers.” The fundamental building blocks to this new polymer class are referred to as “dendrimers.” These dendrimers differ from classical monomers/oligomers by their extraordinary symmetry, high branching and maximized (telechelic) terminal functionality density. The dendrimers possess “reactive end groups” which allow (a) controlled moelcular weight building (monodispersity), (b) controlled branching (topology), and (c) versatility in design and modification of the terminal end groups. Dendrimer synthesis is accomplished by a variety of strategies involving “time sequenced propagation” techniques. The resulting dendrimers grow in a geometrically progressive fashion as shown: Chemically bridging these dendrimers leads to the new class of macromolecules—”starburst polymers” (e.g., (A)n, (B)n, or (C)n).


  1. 1

    P. G. DeGennes and H. Hervet, J. Phys. Lett., 44, 351 (1983).

  2. 2

    W. Burchard, K. Kajiwara, and D. Nerger, J. Polym. Sci., Phys. Ed., 20, 157 (1982).

  3. 3

    M. Maciejewski, J. Macromol. Sci., Chem., A17(4), 689 (1982).

  4. 4

    S. Alexander and R. Orbach, J. Phys. Lett., 43, 625 (1982).

  5. 5

    This terminology was adopted as an extension of present nomenclature which refers to present radial branched systems as “star Polymers.” It should be noted that some scientists refer to the present systems as “cauliflower polymers.” (See ref 1.)

  6. 6

    T. Asahara, Makromol. Chem., 136, 211 (1970).

  7. 7

    D. A. Tomalia, J. R. Dewald, M. Hall, P. Smith, and S. Martin, J. Org. Chem., to be published.

  8. 8

    D. A. Tomalia and L. Wilson, unpublished work.

  9. 9

    S. I. Suminov and A. N. Kost, Russian Chem. Rev., 38, 884 (1969).

  10. 10

    Statistical analysis shows that the mole fraction of unbridged dendrimer species is given by: f 0 = (1−P) N c N r G − 1 where: P=1/(4X-1)$ and X is the moles of ethylene-diamine per mol of ester terminal group in the dendrimer. The exponential--exponential form of the above equation shows the strong dependence of f0 on G. Therefore, very high X values (low P) are essential for the higher generations, to assure unbridged, highly monodispersed dendrimers. A complete description with experimental verification of these statistical predictions will appear elsewhere (S. Martin et al.).

  11. 11

    D. Horn, “Polymeric Amines and Ammonium Salts,” Pergamon Press, Oxford, New York, Toronto, Sydney, Paris, 1979. p 333.

    Google Scholar 

  12. 12

    D. A. Tomalia and G. Killat, “Alkylenimine Polymers,” John Wiley & Sons, New York, N. Y., 1984. in press.

    Google Scholar 

  13. 13

    R. Barbucci, M. Casolaro, P. Ferruti, V. Barone, and F. Lelj Lolivia, Macromolecules, 14, 1203 (1983).

  14. 14

    M. J. Richardson, Proc. R. Soc., London, Ser. A, 279, 50 (1964).

  15. 15

    D. V. Quayle, Nature, London, 209, 5025 (1966).

  16. 16

    H. J. Stapleton, J. P. Allen, C. P. Flynn, D. G. Stinson, and S. R. Kurtz, Phys. Rev. Lett., 45, 1456 (1980).

  17. 17

    B. B. Mandelbrot, “The Fractal Geometry of Nature,” W. H. Freeman and Co., San Francisco, 1983.

    Book  Google Scholar 

  18. 18

    L. M. Chepel, V. A. Topolkaroyev, A. N. Zelenstskii, E. V. Prut, G. M. Trofinova, D. D. Novikov, and Al. Al. Berlin, Polym. Sci. U.S.S.R., 24, 1873 (1982).

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Tomalia, D., Baker, H., Dewald, J. et al. A New Class of Polymers: Starburst-Dendritic Macromolecules. Polym J 17, 117–132 (1985).

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  • Starburst Polymers
  • Straburst Oligomers
  • Dendrimers
  • Topological Macromers
  • Polyamidoamines
  • Dendritic Macromolecules Organic Clusters

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