Number of the records: 1

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

SYSNO ASEP	0346545
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Effect of dilution on structure and properties of polyurethane networks. Pregel and postgel cyclization and phase separation
Author(s)	Dušková-Smrčková, Miroslava (UMCH-V)_RID Valentová, H. (CZ) Ďuračková, Andrea (UMCH-V) Dušek, Karel (UMCH-V)_{RID, ORCID}
Source Title	Macromolecules. - : American Chemical Society - ISSN 0024-9297 Roč. 43, č. 15 (2010), s. 6450-6462
Number of pages	13 s.
Language	eng - English
Country	US - United States
Keywords	network formation ; cyclization ; gelation
Subject RIV	JI - Composite Materials
R&D Projects	GA106/08/1409 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z40500505 - UMCH-V (2005-2011)
UT WOS	000280743300028
DOI	10.1021/ma100626d
Annotation	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.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2011

Number of the records: 1