Volume 56, Number 4, November 2001
|Page(s)||549 - 555|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Gelation and phase separation in colloid-polymer mixtures
Institut Charles Sadron - 6 rue Boussingault, 67083
Strasbourg Cedex, France
2 Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili Carretera de Salou s/n, 43006 Tarragona, Spain
Corresponding author: email@example.com
Accepted: 23 August 2001
We discuss theoretically the phase diagram of a solution containing both linear polymers in a good solvent and small colloidal particles. We consider the case where the colloidal particles are very small and where the polymer adsorbs at the surface of the particles. The partition functions of the various complexes between polymers and colloidal particles are calculated using a scaling approach. In a dilute solution, star-like polymers with a particle at the core are formed if the particle density is very low and necklaces of particles on one polymer are formed if the particle density is large. In a semi-dilute solution, we find a gelation due to the cross-linking of the polymer by the particles and a phase separation.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 82.70.Dd – Colloids / 82.70.Gg – Gels and sols
© EDP Sciences, 2001
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