By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)
New applied sciences continuously generate new calls for for unique fabrics for use in serious environments. The swift advancements of aerospace industries over the past 20 years have required new fabrics to outlive severe low and high temperatures and diverse radiations. The exploration of recent power assets, e.g., sunlight and geothermal, has led us to enhance new sun creditors and geothermal units. Even the hunt for brand spanking new oils has demanded that we examine the corrosive atmosphere of oil fields. within the telecommunication industries, optical fibers were followed largely to interchange metal conductors. even if, not one of the optical fibers can live on abrasion or corrosion with no the applying of a coating fabric. For microelectronics, safeguard by way of coatings and encapsulants is deemed essential to hinder corrosion. one of many significant factors of corrosion has been proven to be water which seems to be considerable 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 really is certainly the foremost aspect in inflicting cathodic or anodic corrosion. hence, water turns into the most important situation in fixing sturdiness difficulties of assorted fabrics in harsh environments.
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Additional info for Adhesives, Sealants, and Coatings for Space and Harsh Environments
Unfortunately epoxy resins can absorb considerable quantities of water, the precise amount and rate of absorption depending upon res in and curing agent structure together with external environmental factors such as temperature and relative humidity. Deleterious effects which can result from 4 exposure to a warm/moist environment 6 include plasticiza-tion 1lowering of glass temperature 2 , ~, 5, ,7 and disruption of the interfacial region between substrate/reinforcement and the organiC phase. B,9,10 45 In recent years halogen1tl~ epoxy resins having substantial hydrophobic characteristics 1 have been developed by several researchers.
Relaxation recovery of the deformed material affects transport behavior, especially for larger size penetrant molecules. This size dependence also should be apparent for transport in materials with deformation-induced voiding or orientation. Diffusive motion is very dependent on the size and shape of the migrating molecule relative to the effective dimensions of the voids or the pathways along or across oriented regions. EFFECTS OF CHEMICAL MODIFICATIONS The effects of modification of the chemical structure of a polymeric material on its fDS behavior are always very pronounced.
A. Steinberg, "Materials for Aerospace," Sci. , ~, 66, Oct. 1986. Reliability of Adhesive Bonds Under Severe EnVironments, National Materials Advisory Board, National Research, Council, Dec. 1984. K. Mater. , lQl, 14, Jan. 1986. P. H. 447. P. Hergenrother, "High Performance Thermoplastics," Angew. Makromol. , 145/146, 323 (1986). P. , (Japan) 12, (1), 73 (1987). E. Cassidy, "An Overview of Polymers for Harsh Environments: Aerospace, Geothermal and Undersea," in Ref. 1. Chang Chih-Ching, "High-Temperature Organic Adhesives--A Review" in Ref.
Adhesives, Sealants, and Coatings for Space and Harsh Environments by Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)