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Sol-gel transition: A model for percolation

✍ Scribed by M. Adam; M. Delsanti; J.P. Munch; D. Durand

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
479 KB
Volume
163
Category
Article
ISSN
0378-4371

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✦ Synopsis

We present experimental results obtained near the sol-gel transition of polyurethane copolymer clusters in which the chemical reaction is a polycondensation reaction. The exponent r characteristic of the mass distribution and the exponent y characteristic of the growth process of polymer clusters as the gelation threshold is approached are measured. The experimental values found, r = 2.20 + 0.04 and y = 1.71 k 0.06, are in good agreement with Monte Carlo simulations using the percolation model. Chemical gelation is a critical phenomenon of connectivity belonging to the same universality class as percolation.

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