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Effect of dilution on structure and properties of polyurethane networks. Pregel and postgel cyclization and phase separation
- 1.0346545 - ÚMCH 2011 RIV US eng J - Journal Article
Dušková-Smrčková, Miroslava - Valentová, H. - Ďuračková, Andrea - Dušek, Karel
Effect of dilution on structure and properties of polyurethane networks. Pregel and postgel cyclization and phase separation.
Macromolecules. Roč. 43, č. 15 (2010), s. 6450-6462. ISSN 0024-9297. E-ISSN 1520-5835
R&D Projects: GA ČR GA106/08/1409
Institutional research plan: CEZ:AV0Z40500505
Keywords : network formation * cyclization * gelation
Subject RIV: JI - Composite Materials
Impact factor: 4.838, year: 2010
Bi-, tri-, and tetrafunctional star-shaped polyol precursors were cross-linked with a star-shaped triisocyanate and the effect of the presence of diluent during network formation on the gel-point conversion, alpha(crit), and on the equilibrium elastic modulus was studied. A linear correlation was found between the shift of the gel-point conversion and the change of intermolecular conversion corresponding to experimental changes of the concentration of EANCs. The dependence of the concentration of EANCs on intermolecular conversion was obtained by branching theory. It has been shown that it is possible to estimate the decrease of effective cross-link density caused by dilution during network formation from the shift of the gel-point conversion.
Permanent Link: http://hdl.handle.net/11104/0005987
Number of the records: 1