A COMPARISON OF RADIATION-INDUCED GRAFT COPOLYMERIZATION UTILIZING ELECTRON ACCELERATORS AND ISOTOPE SOURCES AS RADIATION INITIATORS. Final Report, July 18, 1960-October 17, 1961

Technical Report · Wed Nov 01 04:00:00 EST 1961

OSTI ID:4796952

Odian, G; Oliver, W F; Friedman, L J; Acker, T; Pierre, E; Foltin, J; Ratchik, E

An 1100-curie Co/sup 60/ source, a 1.0-Mev Dynamitron electron accelerator and a 2.0-Mev Van De Graaff electron accelerator were used in an investigation of the radiationinduced graft copolymerization of a methacrylic acidstyrene (2:1 mole ratio) mixture onto polypropylene. A qualitative analysis of the graft copolymer composition, based on spectroscopic analyses and on the dyeability of the grafted samples indicated that isotope initiated grafts are richer in the more polar component than equivalent accelerator initiated copolymer grafts. A study of film thickness effects on the grafting rate revealed that at high Co/sup 60/ dose rates and at accelerator dose rates this grafting process is mainly taking place at the polymer surface. Gamma radiation- induced surface graft copolymerizations of styrene-acrylonitrile and of styrenemcthyl acrylate to Teflon were studied. It was observed that the compositions of the various grafted copolymers are richer in the more polar monomer than would be-predicted from the LewisMayo copolymer composition equation. These results were interpreted in terms of a preferential solvation of the relatively immobile growing graft polymer free radicals by the polar monomers. A brief examination of the post irradiation grafting of machine irradiated polyethylene film with acrylic acid monomer was made. Evidence of postgrafting was detected in samples that had been irradiated to a total dose of 10 Mrads at a dose rate of 0.01 Mrad/sec and then exposed to a 25% purified acrylic acid solution in benzene for periods of 1 to 4 days. (auth)

• Research Organization: Radiation Applications Inc., Long Island City, N.Y.
• NSA Number: NSA-16-013083
• OSTI ID: 4796952
• Report Number(s): NYO-9420
• Country of Publication: United States
• Language: English

Related Subjects

ACCELERATORS
ACRYLATES
ACRYLIC ACID
BENZENE
CATALYSIS
CHEMISTRY
COBALT 60
CYANIDES
DYES
ELECTRONS
FLUORINATED HYDROCARBONS
GAMMA SOURCES
LAYERS
METHACRYLIC ACID
MIXING
NITRILES
ORGANIC FLUORINE COMPOUNDS
POLYETHYLENES
POLYMERIZATION
POLYMERS
PROPYLENE
QUALITATIVE ANALYSIS
RADIATION CHEMISTRY
RADIATION SOURCES
REACTION KINETICS
SPECTROSCOPY
STYRENE
TEFLON
USES
VAN DE GRAAFF ACCELERATORS