ACTIVATED GAS PLASMA SURFACE TREATMENT OF POLYMERS FOR ADHESIVE BONDING: PART II.
PICATINNY ARSENAL DOVER N J
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Activated gas treatment of many polymers results in increased bondability. Theeffect of the treatment depends on such parameters as length of treatment,chemical species present in the activated gas, and temperature of the polymersurface during treatment. Each polymer was treated with excited oxygen andexcited helium each was treated for several different periods of time. Thetreatment was followed by tensile testing of lap-shear sandwhich specimensbonded with an epoxy adhesive. Plots of bond strength vs treatment time showedmaxima for high density polyethylene HDPE treated with helium, cellophanetreated with both oxygen and helium, and fluorinated ethylene- ropylenecopolymer FEP treated with helium and oxygen. Polypropylene was treatedwith helium at several temperatures. Low temperature treatment gave verypoor results while treatment near the softening point of polypropylene gavean eightfold increase in bond strength. Author, modified-PL