Coalescence of polymeric particles in latex films
- Equipe mixte CEA-RP, Service de Chimie Moleculaire, cen Saclay 91191 Gif sur Yvette (France)
Common coatings such as paints or adhesives can be made from aqueous dispersions which are evaporated on the substrate to give a continuous film. The most widely studied systems are latex dispersions, which contain submicrometric particles of soft organic polymers dispersed in water. With such systems, the difficulty is to ensure that the resulting film will be resistant to water, despite the fact that it has been prepared as a stable aqueous dispersion. For this purpose the dispersion must pass through some irreversible transformations. A radical transformation is the coalescence of particles, which yields a continuous polymer film. This transformation will be described for surfactant-covered latex particles, which coalesce in the wet state, and for polyelectrolyte-covered particles, which coalesce in the dry state. The consequences of coalescence will be examined, in particular the expulsion of the surfactants towards the outer boundaries of the film. This may be detrimental to the adhesive properties of the film: thus alternative routes for maintaining resistance to water without using coalescence of the particles will also be examined. {copyright} {ital 1996 American Institute of Physics.}
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 286464
- Report Number(s):
- CONF-950119--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 354; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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