Title: MOISTURE INGRESSION CHARACTERISTICS OF LAMINATES COMPOSITES WITH VARIOUS BARRIER FILMS FOR AEROSPACE APPLICATIONS
Abstract: Fiber reinforced polymeric composites are widely used in aerospace and wind turbine industries because of their distinctive advantages compared to metals and alloys and other materials. Polymeric composites used for aircraft components are usually subjected to wide ranges of environmental conditions where they can absorb a significant amount of moisture or solvents from the environment; thus, their chemical, thermal, and mechanical properties and service lives are considerably reduced. Polymeric coatings are the most common moisture barriers for aerospace composite components for environmental effects. However, due to the application, service environment, weight increase, reliability, cost, and safety requirements, barrier film coatings are chosen as alternative methods in addition to the surface coatings. In this paper, moisture prevention and absorption characteristics of a variety of hydrophobic thin barrier films, including polyvinyl fluoride (Tedlar), polyether ether ketones (PEEK), polyimide (Kapton), and polytetrafluoroethylene (Teflon) were investigated in detail. These hydrophobic films were cobonded to pre-impregnated (pre-preg) glass, carbon and Kevlar fiber composite laminates during the autoclave curing, and then moisture ingression tests were conducted on the composite coupons to verify the moisture prevention characteristics in DI water. The experimental results indicated that using the barrier films as the outermost ply on the composite laminates significantly increased the moisture barrier properties, which can be a drastic improvement for aerospace and wind turbine applications.
Authors: Erkan Kececi, Naif Alzahrani, Mohammed Alamir, and Ramazan Asmatulu
Conference: CAMX 2017 –Orlando