Networks as the Basis of Pre-Thickening SMC

  • S. F. Bush
  • J. M. Methven
  • D. R. Blackburn


The formation of a temporary network by a saturated polyester added to an unsaturated resin appears to provide both an attractive route to the pre-thickening of such resins when used in Sheet Moulding Compounds, and a means of controlling their shrinkage during moulding. It is believed that this is the first report of a successful method of achieving both goals with a single material. The network is based upon the formation of precrystalline clusters of polymer chain segments. The density and character of the network are determined by the compatibility of the saturated polyester and the unsaturated resin.


Solubility Parameter Unsaturated Polyester Vinyl Ester Unsaturated Polyester Resin Urethane Acrylate 
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.
    Brydson, J. A., Plastics Materials, Butterworth, London, 4th edn, 1982.Google Scholar
  2. 2.
    Burns, R., Polyester Molding Compounds, Marcel Dekker Inc., New York, 1982.Google Scholar
  3. 3.
    Flory, P. J., Principles of Polymer Chemistry, Cornell University Press, Ithaca, New York, 1953.Google Scholar
  4. 4.
    Hildebrand, J. H. and Scott, R. L., Solubility of Non-electrolytes, 3rd edn, Rheinhold, New York, 1950.Google Scholar
  5. 5.
    Van Krevelin, D. W., Properties of Polymers, 2nd edn, Elsevier, Amsterdam, 1977, Chapter 8.Google Scholar
  6. 6.
    Williams, R. J. J., Barrajo, J., Adabbo, H. E. and Rojas, A. J., ACS Sym. Ser., 1984, 208, 195–213.Google Scholar

Copyright information

© Elsevier Applied Science Publishers Ltd 1988

Authors and Affiliations

  • S. F. Bush
    • 1
  • J. M. Methven
    • 1
  • D. R. Blackburn
    • 1
  1. 1.Polymer Engineering DivisionUMISTManchesterUK

Personalised recommendations