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The leveling of thermosetting waterborne coatings. Part IV: Effects of film thickness
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.760352407
Subject(s) - thermosetting polymer , materials science , hydrostatic equilibrium , hydrostatic pressure , coating , composite material , surface tension , viscosity , evaporation , component (thermodynamics) , tension (geology) , mechanics , thermodynamics , ultimate tensile strength , physics , quantum mechanics
The influence of film thickness on the leveling of a thermosetting waterborne coating (WBC) was examined. The theory of Patton has been revised to give the proper force balance and modified to include the changes in surface tension and viscosity during leveling by the evaporation of volatile components. However, the predicted leveling process by a numerical method did not coincide with the observed results. Thus, the driving force in the theory, the hydrostatic pressure gradient in the film, was considered to be insufficient to describe the leveling process of the WBC. The hydrostatic pressure gradient can be a component of the driving force to promote leveling, but the existence of an additional component is suggested.