Summary
Model silicone networks obtained by hydrosilation of vinyl terminated polydimethylsiloxane chains have been used extensively to verify molecular theories of rubber elasticity. In these networks, the maximum extent of reaction obtained during cross linking considerably affects their final structure. The degree of completion of the hydrosilation reaction depends on the concentration of reactive groups. A recursive approach and kinetic data from the literature are used to show that, for this particular reaction, perfect networks, i.e. those with high concentration of elastically active network chains, are only obtained when a relatively high concentration of reactive groups is present in the system. This critical concentration corresponds in a bulk reaction to polydimethylsiloxane chains with a number average molecular weight lower than 10,000.
Similar content being viewed by others
References
Rempp, P.; Herz, J.; Hild, G.; Picot, C. (1975), Pure Appl. Chem., 43: 77
Morton, M.; Fetters, L.J., Inomata, J.; Rubio, D.C.; Young, R.N. (1976), Rubber Chem. Technol., 49: 303
Mark, J.E.; Sullivan, J.L. (1977), J. Chem Phys., 66: 1006
Vallés, E.M.; Macosko, C.W. (1979), Macromolecules, 12: 673
Vallés, E.M.; Macosko, C.W. (1976), Rubber Chem. Technol., 49: 1232
Mark, J.E. (1982), Adv. Polym. Science, 44: 1
Andrady, A.L., Llorente, M.A., Sharaf, M.A., Rahalkar, R.R., Mark, J.E., Sullivan, J.L., Yu, C.U., Falender, J.R. (1981), J. Appl. Polym. Sci., 26: 1829.
Chaumont, P.; Beinert, G.; Herz, J.; Rempp, P. (1979), Europ. Polym. J., 15: 459
Vallés, E.M.; Rost, E.; Macosko, C.W. (1984), Rubber Chem. Technol., 57: 55.
Macosko, C.W.; Miller, D.P. (1976), Macromolecules, 9: 199
Miller, D.P.; Macosko, C.W. (1976), Macromolecules, 9: 206
Miller, D.P.; Vallés, E.M.; Macosko, C.W. (1979), Polym. Eng. Sci., 19: 272
Bibbó, M.A.; Vallés, E.M. (1982), Macromolecules, 15: 1293
Villar, M.A., Bibbó, M.A., Vallés, E.M., To be submitted
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Villar, M.A., Vallés, E.M. Influence of the final extent of reaction on the structure of model polydimethylsiloxane networks obtained by the end-linking hydrosilation reaction. Polymer Bulletin 35, 279–284 (1995). https://doi.org/10.1007/BF00963124
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00963124