Title Reactive Finishes for Improving Adhesion in Carbon/Vinyl Ester Laminates
Source Proc. 49th Int. SAMPE Symp. Exhib.
Year 2004
Author(s) Allred, R. E.; Wesson, S. P.; Hoyt, A. E.; Whitehead, J. W.
Abstract The interface is often a limiting factor in determining the durability of composite materials used in harsh environments. Attaining a well-bonded interface is particularly difficult with low-temperature curing matrix resin systems. Silane coupling agents are used extensively to attain adhesion between glass fibers and low-temperature curing resins; however, no analogous approach exists for carbon fibers. In particular, a need exists for a carbon fiber adhesion promoting finish that is compatible with vinyl ester chemistry. In this work, chemistries (finishes) modified to function with vinyl ester moieties during low-temperature cures were formulated and applied to AS4 carbon tows. Composites fabricated with the finished tows and vinyl ester matrices were compared to composites fabricated with unsized and epoxy sized fibers for mechanical properties. Results show that the modified reactive finishes allow control of interfacial adhesion in vinyl ester matrix composite systems that impart superior interface-dominated mechanical properties and are compatible with resin infusion processing. Carbon/vinyl ester composites fabricated with the reactive finishes are also expected to exhibit improved environmental durability due to the improved interfacial bonding.
Keywords reactive, finish, interfacial, carbon, vinyl ester, laminates, composite, bond, matrix, low-temperature, resin, silane, coupling agent, curing resins, carbon fiber, tows, matrices, adhesion, infusion, durability