Effect of dose rate on radiation-induced polymerization of styrene adsorbed on silica gel
The effect of dose rate of polymerization and molecular weight distribution of radiation-induced polymerization of styrene adsorbed on silica gel was studied in a wide dose rate range of 4.4 x 10/sup 4/ to 3 x 10/sup 8/ rad/hr by ..gamma.. rays of /sup 60/Co and electron beams with a Cockcroft--Walton-type accelerator. Dose rate dependence on the initial rate of polymerization was about 1 below 3 x 10/sup 7/ rad/hr, and it decreased gradually at high dose rates. Throughout the dose rate range, graft polymerizations and homopolymerizations by cationic and radical mechanisms proceeded simultaneously. Dose rate dependence of the cationic polymerization was 1 below 3 x 10/sup 7/ rad/hr, while dose rate dependence of the radical polymerization was 0.65 below 3 x 10/sup 7/ rad/hr. At high dose rates, molecular weight and fraction of graft polymer decreased, and fraction of cationic polymerization increased. A very high-molecular-weight graft polymer was formed above 4.4 x 10/sup 5/ rad/hr at the initial stage of the polymerization. The dose rate dependence of this polymerization was larger than 1 and decreased with increase in dose rate. The polymerization seems to be related to an excitation of monomer or growing chain. 5 figures, 4 tables.
- Research Organization:
- Japan Atomic Energy Research Inst., Takasaki
- OSTI ID:
- 6168844
- Journal Information:
- J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 17:2; ISSN JPLCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ADSORBENTS
ADSORPTION
AROMATICS
BEAMS
CHEMICAL ANALYSIS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
DATA
DATA FORMS
DOSE RATES
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
ISOLATED VALUES
KINETICS
LEPTON BEAMS
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PARTICLE BEAMS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERIZATION
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REACTION KINETICS
SILICA GEL
SORPTION
STYRENE
TIME DEPENDENCE
YIELDS