ORBi: Job Nathalie - Rheological determination of the sol-gel transition during the aqueous synthesis of resorcinol-formaldehyde resins

Reference : Rheological determination of the sol-gel transition during the aqueous synthesis of reso...


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Chemical engineering Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/3792

Title :	Rheological determination of the sol-gel transition during the aqueous synthesis of resorcinol-formaldehyde resins
Language :	English
Alternative title :	[fr] Détermination de la transition sol-gel lors de la synthèse de résines résorcinol-formaldéhyde en milieu aqueux
Author, co-author :	Job, Nathalie [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Panariello, Fabian [> > > >]
	Crine, Michel [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires >]
	Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Léonard, Angélique [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires - Département de chimie appliquée >]
Publication date :	1-Feb-2007
Journal title :	Colloids and Surfaces A : Physicochemical and Engineering Aspects
Publisher :	Elsevier Science Bv
Volume :	293
Issue/season :	1-3
Pages :	224-228
Audience :	International
ISSN :	0927-7757
City :	Amsterdam
Keywords :	[en] sol-gel transition ; resorcinol-formaldehyde gel ; rheology ; viscoelasticity ; gelation time
Abstract :	[en] The sol-gel transition of organic gels prepared by polycondensation of resorcinol (R) with formaldehyde (F) in presence of sodium carbonate (C) was monitored by small amplitude oscillatory measurements, at a single frequency. The gelation time (t(g)) was determined from the evolution of the storage (G) and loss (G") moduli versus time. The influence of two synthesis variables, the resorcinol/sodium carbonate ratio (R/C) and the synthesis temperature (7), was investigated. The gelation time was found to decrease with increasing synthesis temperature and decreasing R/C ratio. The apparent activation energy of the reactional system leading to the gelation, calculated from the gelation times obtained between 50 and 90 degrees C, was found to be close to 80 kJ mol(-1) and independent of the R/C ratio. (c) 2006 Elsevier B.V. All rights reserved.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Permalink :	http://hdl.handle.net/2268/3792
	also: http://hdl.handle.net/2268/19810
DOI :	10.1016/j.colsurfa.2006.07.037
Other URL :	http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFR-4KHJK48-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=b0a9fe0d181c0c77ba0bdb5375f46cb7

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