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The leveling of thermosetting waterborne coatings. Part III: Leveling under controlled conditions
Author(s) -
Kojima Shunji,
Moriga Toshinori,
Takenouchi Ken
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760352406
Subject(s) - surface tension , thermosetting polymer , materials science , tension (geology) , composite material , hydrostatic pressure , solvent , curvature , hydrostatic equilibrium , mechanics , ultimate tensile strength , chemistry , organic chemistry , physics , geometry , mathematics , quantum mechanics
Experiments on coated films of water borne, coatings (WBC) under controlled conditions (i.e., 25°C, 65% RH) were carried out to study the mechanism of leveling. Data in a companion paper imply that the development of the surface tension gradients plays an important role in promoting leveling. The stress due to surface tension gradients is found to be much greater than the stress introduced by hydrostatic pressure gradients in the film caused by surface tension and the free boundary curvature of the film. This reconfirms that the use of a co‐solvent, which evaporates faster than water, greatly accelerates the leveling of a WBC.