Počet záznamů: 1

Effect of dilution on structure and properties of polyurethane networks. Pregel and postgel cyclization and phase separation

  1. 1.
    0346545 - UMCH-V 2011 RIV US eng J - Článek v odborném periodiku
    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
    Grant CEP: GA ČR GA106/08/1409
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: network formation * cyclization * gelation
    Kód oboru RIV: JI - Kompozitní materiály
    Impakt faktor: 4.838, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0005987