Surface modification of polyethylene by radiation-induced grafting for adhesive bonding. V. Comparison with other surface treatments. [Gamma radiation]

Journal Article · Tue Jan 01 04:00:00 EST 1980 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1980.070250104· OSTI ID:5486637

Yamakawa, S; Yamamoto, F

Helium gas plasma treatment of low-density polyethylene (LDPE) yields much lower peel strength than oxidative treatment using chromic acid and oxygen gas plasma. The practical adhesion, the bondability retention, and the bond durability of oxidatively treated LDPE sheets, bonded with epoxy adhesives, have been compared with those of partially hydrolyzed LDPE-methyl acrylate surface grafts. The oxidized surfaces easily lose the bondability by light rubbing with tissue paper, solvent extraction, heat aging, and artificial weathering, whereas the grafted surfaces retain the bondability. The bondability loss is due to removal of the oxidized layer, and the bondability retention is due to retention of the surface homopolymer layer. Conventional antioxidants stabilize the grafted but not the oxidized surfaces against thermal oxidative degradation. The grafted LDPE joints have much higher bond durability in humid environments than those of the oxidized LDPE joints. The dry and wet peel strengths of oxidized LDPE joints are greatly improved by application of primers consisting of a base epoxy resin and organic solvents. An adhesion mechanism involving penetration of epoxy adhesives into the oxidized layers and subsequent reinforcement of the layers by curing of the penetrated epoxy is proposed. 5 figures, 5 tables.

• Research Organization: Nippon Telegraph and Telephone Public Corp., Tokai, Japan
• OSTI ID: 5486637
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 25:1; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
CHROMIC ACID
CHROMIUM COMPOUNDS
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
DATA
DATA FORMS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GAMMA RADIATION
GRAFT POLYMERS
HELIUM
HYDROGEN COMPOUNDS
HYDROLYSIS
INFORMATION
INORGANIC ACIDS
IONIZING RADIATIONS
ISOLATED VALUES
LYSIS
METHACRYLATES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDATION
OXYGEN
OXYGEN COMPOUNDS
PLASMA
POLYETHYLENES
POLYMERS
POLYOLEFINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RARE GASES
SOLVOLYSIS
STABILITY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YIELDS