Moisture and temperature induced stresses (hygrothermal stresses) in organic coatings

摘要: Hygroscopic and thermal (hygrothermal, S HT ) stresses were evaluated indirectly by determining the corresponding values of elastic modulus, strain, Poisson's ratio coating; directly using an apparatus (Stressmeter) developed during this study. The results obtained show that stress in a coating principally arises below glass transition temperature (T g coating. level hygrothermal can be considerable is dependent on type coating, nature substrate, any variation and/or relative humidity to which exposed. highest -values (tensile stress) are reached at low temperatures humidities. determination dependency enables evaluate T different interdependence between film formation (i.e., internal explain certain phenomena (e.g., effect history) encountered practice. This study should provide additional knowledge have negative influence adhesion cohesion organic coatings.