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A study of stress development in aqueous gelatin coatings
Author(s) -
Payne Jason A.,
McCormick Alon V.,
Francis Lorraine F.
Publication year - 1999
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/(sici)1097-4628(19990725)73:4<553::aid-app11>3.0.co;2-z
Subject(s) - relative humidity , materials science , gelatin , aqueous solution , composite material , humidity , coating , stress (linguistics) , ultimate tensile strength , chemistry , thermodynamics , biochemistry , physics , linguistics , philosophy
A cantilever deflection technique was used to monitor stress during the drying of aqueous gelatin coatings. Photographic‐grade gelatin was dissolved in deionized water and coated, chilled, and dried. The final average in‐plane tensile stress ranged from 0 to 50 MPa. Measured stresses were independent of the coating thickness and initial solution concentration. At low relative humidity (0%) and low drying temperature (∼ 20°C), the stress grew with time, reaching a constant average magnitude of 46 MPa. Raising the relative humidity above 0% or raising the temperature above 50°C changed the manner in which stress evolved. Stress rose to a peak value and then relaxed to a lower final value. Humidity affected stress evolution more than did temperature, within the limits of this work. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 553–561, 1999