Abstract
Energy absorbability of bi-layer laminates consisting of pressure sensitive adhesive (PSA) layer/cured epoxy layer was studied.The base polymers for the PSAs were acryl block copolymers andseveral types of tackifiers were blended to the base polymers.The energy absorbability (the load-displacement hysteresis loops)of the laminates was examined during impact/rebound process using aninstrumented pendulum impactor.Rosin ester and terpene phenol as tackifiers were miscible with thebase polymer, and the energy absorbability of the bi-layer laminates increased within a particularrange of the tackifier content in PSAs.The maximum energy absorption was achieved at 20wt%addition in case of terpene phenol, at 30wt% addition in case of rosin ester.Whereas, the addition ofpetroleum resin which was not miscible with the base polymer did not improve in the energy absorbability of the laminates.A RUK equation, which is originally for calculating the loss factors (η) of a non-constrained type damping steel with a viscoelastic resin layer on the surface, was applied toexplain the energy absorbability of the bi-layer laminates.The polymer composition dependence ofthe calculated ηusing the viscoelasticity of the PSAs at a particular frequency showed good agreement with that of the actual energy absorbabilityof the laminates.
