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

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 fast advancements of aerospace industries over the last twenty years have required new fabrics to outlive severe low and high temperatures and numerous radiations. The exploration of latest power assets, e.g., sunlight and geothermal, has led us to strengthen new sunlight creditors and geothermal units. Even the hunt for brand new oils has demanded that we research the corrosive setting of oil fields. within the telecommunication industries, optical fibers were followed generally to interchange steel conductors. besides the fact that, not one of the optical fibers can live to tell the tale 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 factors 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's certainly the key element in inflicting cathodic or anodic corrosion. hence, water turns into the main main issue in fixing toughness difficulties of assorted fabrics in harsh environments.

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1. J. Progar, "Evaluation of Poly imide Films as Adhesives,"--J.... Adhes. Sci. , 1 (1) 53 (1987). D. L. St. Clair, "Synthesis and Characterization of a Melt Processable Polyimide," NASA Technical Memo 84494 (1982). 25 66. 67. 68. 69. 70. 71. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. 90. J. L. St. Clair, "Evaluation of a Novel Thermoplastic Poly imide for Bonding Titanium," Int. J. Adhes. , ~ 25, Jan. 1986. L. St. Clair, "Adhesive Development of NASA Langley" presented to Program ReviewlWorkshop, Virginia Polytechnic Institute and State University, Blacksburg, VA, May 1, 1984.

Foster, "Polymers in Caulking and Sealant Materials," L... Chem. , 64 (10), 861 (1987). B. J. E. Huang, "Effects of Environment on Performance of Polysulfide Sealants," in Ref. 1. J. M. Klosowski, "Durability of Silicone Sealants," in Ref. 1. G. Holden, "Styrenic Block Copolymers in Sealants," Elastomerics, 112 (3), 26 (1987). G. Chu, "Hot Melt Sealants Based on Thermoplastics Elastomers," in Ref. 1. M. K. L. Tan, "Durability of Acrylic, Polysulfide and Silicone Sealants Bonded to Aluminum," Durability Build.

21 These data fall into two fairly well defined categories (a plot of moles of polar groups versus moles of water sorbed gives two nearly straight lines). One category, with essentially a one-to-one relation between moles of water sorbed versus moles of groups is for (acidic) hydrogen-donors (hydroxyl, carboxyl and peptide). 15 moles of water/mole of groups, is for (basic) hydrogen-acceptors (nitrile, carbonyl, ester, ether). When a polymer such as polyethylene undergoes progressive photooxiation, the sorption and transport processes reflect the changing modes of sorption for different types of penetrants as the composhrion of the polymer changes due to photodegradation product formation.

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