Page 260 - Handbook of Adhesives and Sealants

Surfaces and Surface Preparation 229

TABLE 6.12 Common Active Surface Treatments for Polymeric Substrates
(Continued)
(2) Common Active Physical Treatments
Treatment Polymer Result
Flame Polyolefins, nylon, Oxidizes the surface
other low surface introducing polar
energy plastics groups (carbonyl,
carboxyl, amide, and
hydroperoxide)
Corona or electrical discharge Polyolefins, Oxidation and
polyethylene introduction of active
terephthalate, PVC, groups such as
polystyrene, carbonyls, hydroxyls,
cellulose, hydroperoxides,
fluorocarbons aldehydes, ethers,
esters, and
carbonoxylic acids
Increased surface
roughness
Plasma discharge Nearly all low Crosslinking of the
energy surfaces surface
including most Surface oxidation with
thermoplastics
the formation of polar
Silicone rubber and groups
other low surface Grafting of active
energy elastomers
chemical species to the
surface
Halogenation of the
surface
Ultraviolet radiation Polyolefins, Chain scission of
polyethylene surface molecules
terephthalate, followed by
EPDM rubber, other crosslinking
low energy polymers
Surface oxidation
Laser treatment Polyolefins, Removal of surface
engineering plastics, contamination and
sheet molding weak boundary layers
compounds
Roughening of filled
surfaces
Soften the surface of
thermoplastics
Ion beam etching Fluorocarbons Creation of needles or
spires on the surface
for improved
interlocking