MICROPARTICLE AND FIBER REINFORCEMENT OF EPOXY RESINS.
Abstract
Microparticle and fiber materials have been investigated as reinforcing agents for a diglycidyl ether of bisphenol a type of epoxy resin. These materials were limited to low concentrations in order to insure retention of the resin binder properties, such as viscosity and pot life, required for glass-filament-winding processes. In general the material screened did not substantially improve the compression properties of the cast resin as compared to the best unfilled controls. The greatest improvement was achieved with colloidal boehmite alumina and Hi-Sil X303 silica, when the stoichiometric amount of amine curing agent was used. The alumina was superior to the silica in increasing the resin modulus of toughness, but the silica gave higher values for the compression yield and ultimate strengths. The highest values for the compression properties of the unfilled resin controls were obtained when 78% of the stoichiometric amount of m-phenylene diamine (CL) curing agent and a critical 'B' stage curing temperature were used. As indicated by a limited study, 'flaw sensitivity' or surface imperfections may significantly influence the compression strength of unfilled cast resin test specimens, whereas these effects were negligible with specimens containing Hi-Sil X303 silica. Experiments to determine the effect on the interlaminar shear strength of glass-filament NOL rings wound with resins containing colloidal boehmite alumina and Hi-Sil X303 silica were inconclusive because of the high void content of state-of-the-art wound NOL rings. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 26, 1966
- Accession Number
- AD0640054
Entities
People
- A. G. Sands
- E. J. Kohn
- R. C. Clark
Organizations
- United States Naval Research Laboratory