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|Author(s):||Christopher C. White; Kar T. Tan; Bryan D. Vogt; Donald L. Hunston;|
|Title:||The Origin of Critical Relative Humidity in Adhesion|
|Published:||May 11, 2009|
|Abstract:||Water is ubiquitous in the atmosphere. Unfortunately, adhesive bonding is susceptible to the environmental attack of water leading to significant depreciation in joint strength and subsequently to premature failures [1-6]. This susceptibility of bonding to moisture attack has been a subject of concern for many years. However, there are still unanswered questions concerning the durability of adhesive joints in hostile environments, which has been a stumbling block for wider application of adhesive in load-bearing structures. Understanding the mechanics and mechanisms of degradation of adhesive joints, thus, is a key factor for more extensive use in future engineering applications. The aim of the present study is to develop a more complete understanding of mechanisms of moisture attack. Model adhesive joints consisting of homologous series of poly(n-alkyl methacrylate)s (PAMA) supported on SiOx substrates were studied. This polymer series enables subtle chemistry effects on moisture-induced adhesion loss to be examined. A fracture mechanics approach based on a shaft-loaded blister test was adapted to measure adhesive fracture energy of the joints over humidity extremes. Infrared spectroscopy and contact angle measurement were used to elucidate mechanisms of adhesion loss.|
|Proceedings:||2009 week of learning Pressure Sensitive Tape Council|
|Pages:||pp. 135 - 144|
|Dates:||May 11-15, 2009|
|Keywords:||Adhesion,relative humidity,surface chemistry,neutron reflectivity|
|Research Areas:||Service Life Prediction, Coatings/Sealants, Building and Fire Research|