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Activated gas plasma surface treatment of polymers for adhesive bonding
Author(s) -
Hall J. Richard,
Westerdahl Carolyn A. L.,
Devine Andrew T.,
Bodnar Michael J.
Publication year - 1969
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1969.070131006
Subject(s) - polypropylene , materials science , polyethylene , polymer , polystyrene , polymer chemistry , vinyl acetate , composite material , copolymer , polyethylene terephthalate , adhesive , polycarbonate , layer (electronics)
Polyethylene, polypropylene, poly(vinyl fluoride) (Tedlar), polystyrene, nylon 6, poly(ethylene terephthalate) (Mylar), polycarbonate, cellulose acetate butyrate, and a poly(oxymethylene) copolymer were treated with activated helium and with activated oxygen. Mechanical strengths of adhesive‐bonded specimens prepared from treated and from untreated coupons were compared. Polyethylene (PE) and polypropylene (PP) showed the greatest increases in bond strength. Oxygen and helium were both effective with polyethylene, but polypropylene showed no improvement when treated with activated helium. The results with excited helium parallel the effects of ionizing radiation on these two polymers, as does the appearance of unsaturation bands in the infrared (965 cm −1 in PE, and 887 and 910 cm −1 in PP). Active nitrogen produced excellent bond strength with polyethylene but not with polypropylene. Of the remaining polymers examined, Tedlar, polystyrene, and nylon 6 showed the greatest improvement in bondability after treatment, and Mylar showed moderate improvement. Polycarbonate, cellulose acetate butyrate, and the poly(oxymethylene) copolymer gave approximately two‐fold increases in lap‐shear bond strength. In several cases, significant differences in response to time of treatment and type of excited gas were found.