Abstract
The damping properties and the adhesive properties of carboxyl-terminated butadiene acrylonitrilerubber (CTBN)/epoxy polymer alloys were evaluated.CTBN/diglycerol polyglycidyl ether (DGPGE) alloy resin including 30wt% CTBN showed micro-phase separated morphology with rubber-rich continuous phases and epoxy-rich dispersed phases.The composite loss factor (η) for a steel laminate, which consisted of two steel plates with the CTBN/epoxy alloy resin layer in between, depended heavily on the environmental temperature and the resonant frequencies. Also, both shear adhesive strength and peel adhesive strength of the resin to aluminum substrates were marginal, which would originate in the low strength and elongation capacity of the CTBN/DGPGE alloy.In the meantime, CTBN/diglycidyl ether of bisphenol-A (DGEBA) alloy resin including 60wt% CTBN did not indicate clear micro-phase separation in nano-scale, which would mean the components had excellent miscibility. The CTBN/DGEBA cured resin had high tanσ in broad temperature range, which resulted in the high loss factor （η＞0.1） for the steel laminate in broad temperature range and several resonant frequencies. The temperature dependence of η and the order of η among resin formulations could be explained, according to the theory proposed by Ross, Unger, and Kerwin. The high peel-adhesive strengths of the CTBN/DGEBA alloy resin would originate in the high energy absorption capacity of the bulk rosin.
