Surface modification of polyethylene by radiation-induced grafting for adhesive bonding. IV. Improvement in wet peel strength. [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.1980.070250103· OSTI ID:5371836

Yamakawa, S; Yamamoto, F

Adhesive joints of hydrolyzed methyl acrylate grafts, bonded with epoxy adhesives, yield extremely high peel strength (adherend failure) in dry conditions. However, when the joints are exposed to humid environments, the peel strength rapidly decreases with exposure time and then reaches a constant value (wet peel strength). Since the locus of failure changes from the adherend to the homopolymer layer with decreasing peel strength, the decrease is due to a decrease in mechanical strength of the homopolymer layer itself, which results from its swelling by water absorption. Many attempts to reduce the swelling of the homopolymer layer or to strengthen the swollen homopolymer layer were unsuccessful except (1) priming with epoxy solutions consisting of a base epoxy resin and organic solvents which can dissolve not only epoxy resins but also hydrolyzed poly(methyl acrylate) and (2) partial etching of the homopolymer layer by photo-oxidative degradation. All the results on the improvement in wet peel strength can be explained in terms of the penetration of epoxy resins into the homopolymer layer and subsequent curing of the penetrated epoxy resin. 15 figures, 1 table.

• Research Organization: Nippon Telegraph and Telephone Public Corp., Ibaraki, Japan
• OSTI ID: 5371836
• 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
ADHESIVES
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA FORMS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
EPOXIDES
ETCHING
EXPERIMENTAL DATA
GAMMA RADIATION
GRAFT POLYMERS
HYDROLYSIS
INFORMATION
IONIZING RADIATIONS
ISOLATED VALUES
LYSIS
METHACRYLATES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SOLVOLYSIS
SURFACE FINISHING
SURFACE PROPERTIES
SURFACE TREATMENTS
YIELDS