Gelation and percolation : swelling effect
- 1 January 1986
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 47 (8) , 1273-1277
- https://doi.org/10.1051/jphys:019860047080127300
Abstract
Small angle neutron scattering experiments were performed on Polyurethane branched polymers synthetized near the gelation threshold. The exponent τ of the size distribution function is measured, on a system cross-linked by polycondensation. We find τ = 2.2 ± 0.04. This leads to a fractal dimension for the polymers in the reaction bath Dp = 2.5 ± 0.09, in agreement with percolation model. In the dilute state, the fractal dimension is D = 1.98 ± 0.03, in agreement with recent predictions. Thus the largest branched polymers are swollen by dilution, and behave as lattice animalsKeywords
This publication has 4 references indexed in Scilit:
- Fractal Geometry of Silica Condensation PolymersPhysical Review Letters, 1984
- Application of fractal concepts to polymer statistics and to anomalous transport in randomly porous mediaJournal of Statistical Physics, 1984
- Dilution and polydispersity in branched polymersJournal de Physique Lettres, 1984
- An experimental study of gelation of chainsJournal de Physique Lettres, 1984