By D. M. Brewis, I. Mathieson
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Extra resources for Adhesion and Bonding to Polyolefins (Rapra Review Reports; Report)
Test pieces consisting of a fabric-backed SBR 1502 layer bonded directly to PETP film were T-peel tested at various rates and temps. 727-46 SURFACE MODIFICATION OF POLY(TETRAFLUOROETHYLENE) FILMS BY PLASMA POLYMERISATION AND UVINDUCED GRAFT COPOLYMERISATION FOR ADHESION ENHANCEMENT WITH ELECTROLESSLY-DEPOSITED COPPER Yang G H; Kang E T; Neoh K G Singapore,National University Hydrogen plasma-pretreated PTFE films were surface modified either by plasma polymerisation and deposition © Copyright 2002 Rapra Technology Limited References and Abstracts of glycidyl methacrylate or by UV-induced graft copolymerisation with glycidyl methacrylate.
There has been considerable controversy regarding the effect of ‘small molecules’ on polymer surfaces. Some workers have favoured the idea that the basic reason for poor adhesion with polyolefins is the presence of these molecules and the subsequent formation of a weak boundary layer. Chemical changes caused by pretreatments are regarded by these workers as of secondary importance. The present authors believe that it is necessary to chemically modify polyolefins to achieve good adhesion if a diffusion mechanism does not operate.
Even if the EPDM was oxidised by the corona treatment, there would still be a cohesively weak layer on its surface. Where elastomers possess carbon-carbon double bonds there is the possibility that pretreatment may be effective by addition or substitution reactions. Thus some reagents may be effective with unsaturated hydrocarbons such as SBR and SBS but not with EP elastomers. This is demonstrated by the work of Lawson and co-workers (349) who found that treatment with trichloroisocyanuric acid in ethyl acetate resulted in the introduction of substantial quantities of chlorine into SBR, polybutadiene and natural rubber, but not into EPDM.