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| Volume 1, Issue 01 - 2006, January |
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| 5 |
Control of Performance of Nanostructured Polymer Network Precursors by Differences in Reactivity of Functional Groups |
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| Pages 45-53 |
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| K. DUSEK1, M. DUSKOVA-SMRCKOVA2 AND J. HUYBRECHTS3 |
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1 Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague,
2 Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, Prague, members of Consortium for Research of Nanostructured and Crosslinked Polymeric Materials (CRNCPM) Czech Republic
3 DuPont Performance Coatings, DuPont Belgium, Mechelen, Belgium |
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| Received 11 October 2005; accepted 7 December 2005 |
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| The effect of differences in reactivity of functional groups of the same type on formation of polymer networks was modelled using the statistical theory of branching processes. Two types of precursors were examined - a tetrafunctional star and a statistical copolymer of functional and non-functional monomers. The difference in reactivities of groups of the same kind control the curing regime especially on the time scale. As a function of conversion of functional groups, the dependencies of structural parameters show up selfsimilarity especially when randomization in group distribution comes into play. The degree of polymerization and compositional distributions in statistical functional copolymers cause earlier gelation and increased soluble fraction. |
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