[en] Solutions of alpha,omega-sodium sulfonatopolyisoprene (alpha,omega NaPIPS) in toluene are studied using static and dynamic light scattering and dynamic mechanical analysis. At concentrations above 4 g/L, which is well below the overlap concentration of the polymer chains (C*), a transient network is formed characterized by a plateau modulus at high frequencies and a relatively narrow viscoelastic relaxation time distribution. The intensity autocorrelation function of the transient network shows two relaxational modes: a relatively fast diffusional mode close to the co-operative diffusional mode of semidilute solutions of the unfunctionalized polymers and a slow broader mode which becomes independent of the scattering angle at a concentrations close to C*. The relation between this slow mode and the viscoelastic relaxation is discussed. Both the slow mode and the viscoelastic relaxation processes have an Arrhenius temperature dependence with the same activation energy, E(a) = 25 kJ/mol.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Johannsson, Ragnar; Université du Maine, Le Mans, France > Laboratoire de Physico Chimie Macromoléculaire
Chassenieux, Christophe; Université du Maine, Le Mans, France > Laboratoire de Physico Chimie Macromoléculaire
Durand, Dominique; Université du Maine, Le Mans, France > Laboratoire de Physico Chimie Macromoléculaire
Nicolai, Taco; Université du Maine, Le Mans, France > Laboratoire de Physico Chimie Macromoléculaire
Vanhoorne, Pierre ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Dynamic properties of the transient network formed by telechelic ionomers studied by dynamic light scattering and dynamic mechanical analysis
Publication date :
04 December 1995
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
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