Abstract
AbstractAdhesion of plasma‐pretreated polytetrafluoroethylene (PTFE) films to glass foils silanized with 3‐aminopropyltriethoxysilane (APS) was demonstrated via thermally induced surface graft polymerization with concurrent lamination. The simultaneous thermal grafting and lamination process was carried out under atmospheric conditions in the presence of pure acrylic acid (AAc) or aqueous solutions of acrylamide (AAm) and in the absence of polymerization initiator. The chemical composition and microstructure of the modified PTFE films and glass foils were characterized by XPS. The effects of the plasma pretreatment time for the substrates, thermal grafting/lamination temperature and time and graft monomers on the adhesion strength of the PTFE/APS‐glass junction were studied. The adhesion strengths of PTFE/APS‐glass assemblies were significantly improved in the presence of AAc or AAm. The 180° peel adhesion strength of the PTFE/AAc/APS‐glass and the PTFE/AAm/APS‐glass assemblies can reach about 11.2 and 4.6 N cm−1, respectively. Analysis of the mechanically delaminated surfaces by XPS suggests that the failure modes of both assemblies involve mainly the cohesive failure in the PTFE substrate and some very small adhesion failure in the graft layer. Copyright © 2004 John Wiley & Sons, Ltd.
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