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A mechanism for the consolidation of the structure of clay–latex coatings
Author(s) -
Watanabe J.,
Lepoutre P.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070271112
Subject(s) - consolidation (business) , shrinkage , materials science , coalescence (physics) , capillary action , composite material , colloid , coating , network structure , chemical engineering , physics , accounting , machine learning , astrobiology , computer science , engineering , business
Attempts have been made to follow the process of consolidation, during drying, of the structure of a paper coating based on clay and latex by the electron microscope observation, and the analysis of coatings quenched by freezing at various stages and freeze‐dried. Three phases are considered, separated by two critical concentrations. At the first critical concentration (FCC), a 3‐dimensional network is formed, and particle motion is greatly restricted. The water–air interface recedes into the surface capillaries, creating a capillary pressure that causes a shrinkage of the 3‐dimensional network until a second critical concentration (SCC) is reached at which the network is fixed and air enters the rigid structure. Latex stiffness and colloidal interactions influence the critical concentrations. The latex coalescence process has been observed to take place over a relatively narrow concentration range after the FCC and is completed at the SCC.