Radiation-induced polymerization at high dose rate. III. Isoprene in bulk. [1. 5 MeV electron beams]

Journal Article · Mon Dec 01 04:00:00 EST 1980 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1980.170181205· OSTI ID:6696352

Hayashi, K; Tachibana, M; Okamura, S

Radiation-induced polymerization of isoprene in bulk state was studied at 25/sup 0/C in a wide dose rate range. Variations of the rate of polymerization and molecular weight of the products were essentially the same as those observed in the monomers which were capable of both radical and cationic polymerizations. At low dose rate, 7.0 to 230 rad/sec, radical polymerizations took place. At high dose rate, 8.8 x 10/sup 3/ to 2.2 x 10/sup 5/ rad/sec, radical and cationic polymerizations took place concurrently. The average molecular weight of the high-dose-rate product was about 850, independent of dose rate. The microstructure of the products at high dose rate consisted mainly of trans-1,4 units with only about 7% of cis-1,4 and 10% of 3,4-vinyl units. The residual unsaturation in the high-dose-rate products was 90%. Decreases in cis units and residual unsaturation at high dose rate were accounted for by the change in predominant mechanism of polymerization with dose rate.

• Research Organization: Japan Atomic Energy Research Inst., Osaka
• OSTI ID: 6696352
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 18:12; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTAL STRUCTURE
DIENES
DOSES
ELECTRON BEAMS
ENERGY RANGE
HYDROCARBONS
ISOPRENE
LEPTON BEAMS
MEV RANGE
MEV RANGE 01-10
MICROSTRUCTURE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
PARTICLE BEAMS
POLYENES
POLYMERIZATION
RADIATION CHEMISTRY
RADIATION DOSES
RADIATION EFFECTS
RADICALS