Nonfiction 10

Download Adhesives, Sealants, and Coatings for Space and Harsh by Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.) PDF

By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)

New applied sciences regularly generate new calls for for unique fabrics for use in critical environments. The swift advancements of aerospace industries over the past 20 years have required new fabrics to outlive severe low and high temperatures and numerous radiations. The exploration of latest strength assets, e.g., sunlight and geothermal, has led us to improve new sunlight creditors and geothermal units. Even the hunt for brand spanking new oils has demanded that we learn the corrosive surroundings of oil fields. within the telecommunication industries, optical fibers were followed largely to interchange steel conductors. besides the fact that, not one of the optical fibers can live on abrasion or corrosion with out the appliance of a coating fabric. For microelectronics, defense when it comes to coatings and encapsulants is deemed essential to hinder corrosion. one of many significant motives of corrosion has been proven to be water which seems to be ample in our earthly environments. Water can assault the majority adhesive (or sealant), the interface, or the adherend. Water may also reason delamination of coating movie, and it truly is certainly the foremost component in inflicting cathodic or anodic corrosion. therefore, water turns into the foremost quandary in fixing sturdiness difficulties of assorted fabrics in harsh environments.

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For penetrants below their critical temperature, D and S are usually functions of the sorbed concentration with the dependence magnitude increasing as the sorbed concentration increases. D is generally more dependent on c than is S. , glassy polymers) the sorption and transport processes are often accompanied by penetrant-induced swelling processes which are governed by the relaxation processes of the swelling polymer. , ti/e). Such "anomalous" sorption-diffusion processes also are common in polymers with significant polymer-polymer interactions which are labile to disruption by penetrant on a timescale comparable to or greater than the sorption-diffusion unit process timescale.

Broutman, "Water in Epoxy Resins Part I. NonFickian Sorption Processes," Polym. Eng. , ~ (9), 521 ( 1985) . T. C. Wong and L. J. Broutman, "Water in Epoxy Resins Part I I. Diffusion Mechanism," Polym. Eng. , ~ (9),529 (1985). M. Brewis, J. A. Shalash, "The Effect of Water and Heat on the Properties of an Epoxide Adhesive in Relation to the Performance of Single Lap JOints," Polym. , (24), 67 ( 1983) . L. Rathbun and P. Wh. Schuessler, "Moisture Permeation of Polymer Sealants and Interface Modifying Films," in Adhesive Chemistry-Developments and Trends, Ed.

Polym. , I, 289 (1951). A. Barrie, "Water in Polymers," in Diffusion in. Polymers, J. S. , Academic Press, London, Chapter 8, p. 264 (1968). R. Duran, L. E. Rogers, to be published. J. A. R. Griffith+ *RARDE, Waltham Abbey, Essex, UK +Naval Research Laboratory, Washington DC, 20375 USA ABSTRACT The absorption of water by the organic polymeric materials employed in adhesive and surface coating systems is generally considered harmful. Disadvantageous effects resulting from exposure to warm/moist environments can include plasticization, lowering of glass temperature and disruption of the interfacial region between substrate and organic phase.

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