The adhesive and durability of adhesive‐poly (ethylene terephthalate) film joints

Abstract

PurposeThe purpose of this paper is to research the durability of the adhesive‐poly(ethylene terephthalate) film joints.Design/methodology/approachThe adhesive‐poly(ethylene terephthalate) joints are prepared with poly ethylene terephthalate film synthesised from thioglycolic acid, terpene hydrocarbon resin and acetone resolution at room temperature. These joints are characterised by methods of peel strength tests, energy dispersive X‐ray spectroscopy (EDX) and analysis of glass transition temperature (Tg) to examine their durability.FindingsPeel strength tests and EDX analyses prove that water diffusion in different humidity aging conditions causes similar changes, namely having the time‐temperature equivalence at 45°C for 200, 300, 500 and 600 h, respectively, almost corresponding with those at 55°C for 100, 200, 300 and 400 h, respectively, and at 65°C for 50, 100, 150 and 200 h, respectively. The changes in EDX spectra of adhesive‐poly(ethylene terephthalate) film joints indicate that the rate of water penetration in the adhesive is faster than that in the poly(ethylene terephthalate) film. In humidity aging process, the decline ratio of peel strength of adhesive‐poly(ethylene terephthalate) film joints treated with Co60 irradiation is lower than that treated with acetone washing or chemical treatment.Originality/valueThe paper shows that using EDX for analysis of durability of adhesive film joints is of significance to industrial process.