Evaluation of Reinforced Thermoplastic Composites and Adhesives.

摘要

Kevlar-49 fabric laminates with polysulfone resin matrix were evaluated for mechanical and electrical properties and environmental resistance to explore its potential for secondary and primary aircraft structure. Investigations indicated Kevlar-49 reinforced thermoplastic laminates in general exhibited properties equivalent to laminates made with thermosetting matrices. Thermoplastic polymers with service temperatures in excess of +300 F were screened with three polymers being subjected to in-depth study. These polymers were 200P polysulfone (+325 F service), 720P polysulfone (+400 F service) and NR150A polyimide (+450 F service). Each material exhibited good property translation and thermal stability within the stated service temperature range. Processing conditions for the polymers were within the limitations of most commercial autoclaves. Polysulfone resin was evaluated as an adhesive and exhibited excellent adhesive properties for bonding stainless steel and composites. Values in excess of 4500 psi and 3400 psi were obtained at 70 F and +250 F, respectively, on stainless steel lap bond specimens. Composite-to-composite bonds produced values in excess of 8000 psi with a polysulfone adhesive.