RADIATION-INDUCED GRAFT COPOLYMERIZATION OF BUTADIENE TO POLYOLEFIN

Journal Article · Tue Jan 01 04:00:00 EST 1963 · Proc. Japan Conf. Radioisotopes

OSTI ID:4707730

Kadonaga, M; Furuhashi, A; Ono, M

The gas flow method was used for the radioinduced graft polymerization of butadiene onto a polyolefin. High density polyethylene (PEH), low density polyethylene (PEL), and polypropylene (PP) films were irradiated by Co/sup 60/ in the butadiene gas flow. The grafting ratio is directly proportional to the irradiation time except for the thin films. Optimum temperature for the grafting is found in the range 50 to 60 deg C in PEH and PP but it decreases below 20 deg C in PEL. The rate of grafting increases with the increase of film thickness for the same polymer. In the direct radiation grafting of butadiene in the liquid phase, the retarding effect is scarcely observed, and the grafting is homogeneous throughout the film. The rate of grafting in PEH is always higher than that in PEL; therefore, it is not propontional to the amount of amorphous material. The finding that the relations of the rate of grafting onto the same thick films of each polymer are PEH > PP > PEL, and particularly PEH > PEL x PP in the direct grafting in the liquid phase of butadiene, suggests that the grafting reaction is more affected by the degree of branching than the crystallinity of the polymer. It was estimated from the infrared absorption spectra of the graft copolymers that the double bonds of grafted polybutadiene consist of trans-1,4-vinylidene (78%) and vinyl (22%) groups. The cis-1,4-vinylidene group cannot be observed. It was concluded that the mechanism of the grafting reaction is independent of the structure of the polyolefin. (P.C.H.)

• Research Organization: Nippon Telegraph and Telephone Public Corp.
• NSA Number: NSA-17-030192
• OSTI ID: 4707730
• Journal Information: Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 5th, No. 4
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ABSORPTION
ALKENES
BONDING
BUTADIENE
CHEMICAL REACTIONS
COBALT 60
CRYSTALS
DENSITY
FILMS
GAMMA RADIATION
GAS FLOW
GENERAL AND MISCELLANEOUS
GRAFT POLYMERS
HOMOGENEOUS REACTORS
INFRARED RADIATION
IRRADIATION
LIQUIDS
POLYETHYLENES
POLYMERIZATION
POLYMERS
PROPYLENE
SPECTRA
TEMPERATURE
THICKNESS
VINYL RADICALS