Page 279 - Handbook of Adhesives and Sealants

Surfaces and Surface Preparation 245

TABLE 6.14 Lap Shear Strength for Several Plasma Treatmented Polymers
Bond strength, psi
After plasma
Adherends Adhesive Control treatment Source
High density polyethylene– Epoxy–polyamide 315 3500 1
aluminum
Low density polyethylene– Epoxy–polyamide 372 1466 1
aluminum
Nylon 6–aluminum Epoxy–polyamide 846 3956 1
Polystyrene–aluminum Epoxy–polyamide 566 4015 1
Mylar–aluminum Epoxy–polyamide 530 1660 1
Polymethylmethacrylate– Epoxy–polyamide 410 928 1
aluminum
Polypropylene–aluminum Epoxy–polyamide 370 3080 1
Tedlar, PVF–aluminum Epoxy–polyamide 278 1370 1
Celcon acetal–aluminum Epoxy–polyamide 118 258 1
Cellulose acetate butyrate– Epoxy–polyamide 1090 2516 1
aluminum
Thermoplastic polyester Epoxy 520 1640 2
PBT
Thermoplastic polyester Polyurethane 190 960 2
Polyetherimide Epoxy 190 2060 2
Polycarbonate Epoxy 1700 2240 2
Polycarbonate Polyurethane 540 1140 2
Delrin acetal Epoxy 160 650 2
Polyester PET Epoxy 683 6067 3
Fluorocarbon, ETFE Epoxy 10 293 4
SOURCES:
1. Hall J. R., et al., ‘‘Activated Gas: Plasma Surface Treatment of Polymers for Adhesive
Bonding’’, Journal of Applied Polymer Science, 13, 2085–2096, 1969.
2. Kaplan, S. L., and Rose, P. W., ‘‘Plasma Treatment Upgrades Adhesion of Plastic Parts’’,
Plastics Engineering, May 1988.
3. Sangiuolo, S., and Hansen, W. L., International Coil Winding Association Technical Con-
ference, Rosemont, IL, 1990.
4. Hansen, G. P., Rushing, R. A., et al., ‘‘Achieving Optimum Bond Strength with Plasma
Treatment’’, Technical Paper AD89-537, Society of Manufacturing Engineers, Dearborn,
Mich., 1989.

these primers operate is diffusion into the plastic and the creation of
partially chlorinated surface, which can interact more strongly with
polar adhesives. A resorcinol formaldehyde primer substantially im-
proves the adhesion to nylon. Isocyanate primers give large improve-
ments in the adhesion between urethane adhesives and styrene bu-