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Durable Suit Bladder with Improved Water Permeability for Pressure and Environment SuitsWater vapor permeability is shown to be useful in rejecting heat and managing moisture accumulation in launch-and-entry pressure suits. Currently this is accomplished through a porous Gortex layer in the Advanced Crew and Escape Suit (ACES) and in the baseline design of the Constellation Suit System Element (CSSE) Suit 1. Non-porous dense monolithic membranes (DMM) that are available offer potential improvements for water vapor permeability with reduced gas leak. Accordingly, three different pressure bladder materials were investigated for water vapor permeability and oxygen leak: ElasthaneTM 80A (thermoplastic polyether urethane) provided from stock polymer material and two custom thermoplastic polyether urethanes. Water vapor, carbon dioxide and oxygen permeability of the DMM's was measured in a 0.13 mm thick stand-alone layer, a 0.08 mm and 0.05 mm thick layer each bonded to two different nylon and polyester woven reinforcing materials. Additional water vapor permeability and mechanical compression measurements were made with the reinforced 0.05 mm thick layers, further bonded with a polyester wicking and overlaid with moistened polyester fleece thermal underwear .This simulated the pressure from a supine crew person. The 0.05 mm thick nylon reinforced sample with polyester wicking layer was further mechanically tested for wear and abrasion. Concepts for incorporating these materials in launch/entry and Extravehicular Activity pressure suits are presented.
Document ID
20090042718
Document Type
Conference Paper
Authors
Bue, Grant C. (NASA Johnson Space Center Houston, TX, United States)
Kuznetz, Larry (Universities Space Research Association Houston, TX, United States)
Orndoff, Evelyne (NASA Johnson Space Center Houston, TX, United States)
Tang, Henry (Wyle Integrated Science and Engineering Group Houston, TX, United States)
Aitchison, Lindsay (NASA Johnson Space Center Houston, TX, United States)
Ross, Amy (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Man/System Technology and Life Support
Report/Patent Number
JSC-CN-19219
Meeting Information
40th International Conference on Environmental Systems(Barcelona)
Distribution Limits
Public
Copyright
Other