Peel strength of uncrosslinked styrene-butadiene rubber adhered to polyester film

摘要

Testpieces consisting of a fabric-backed SBR 1502 layer bonded directly to polyethylene terephthalate (PET) film were T -peel tested at various rates R and temperatures.Peel energies were superposed to fonn mastercurves using shift factors a_T in accord with the universal WLF equation.When peeled at intennediate reduced rates (Ra_T),failure was cohesive within the SBR 1502,while,at sufficiently high or low Ra_T,interfacial separation between the rubber and PET occurred.These results markedly contrast those found by Gent and Petrich1 using similar testpieces with another type of rubber,SBR 1513.They found cohesive failure at sufficiently low Ra_T and interfacial failure when Ra_T was high.The different behavior of the two elastomers is attributed to stronger interfacial attraction with SBR 1513 and its lower strength.General considerations governing the locus of failure during peel adhesion testing are discussed.