Reference : Rheological determination of the sol-gel transition during the aqueous synthesis of reso...
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/3792
Rheological determination of the sol-gel transition during the aqueous synthesis of resorcinol-formaldehyde resins
English
[fr] Détermination de la transition sol-gel lors de la synthèse de résines résorcinol-formaldéhyde en milieu aqueux
Job, Nathalie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Panariello, Fabian [> > > >]
Crine, Michel mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Léonard, Angélique mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires - Département de chimie appliquée >]
1-Feb-2007
Colloids and Surfaces A : Physicochemical and Engineering Aspects
Elsevier Science Bv
293
1-3
224-228
Yes (verified by ORBi)
International
0927-7757
Amsterdam
[en] sol-gel transition ; resorcinol-formaldehyde gel ; rheology ; viscoelasticity ; gelation time
[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.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/3792
also: http://hdl.handle.net/2268/19810
10.1016/j.colsurfa.2006.07.037
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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