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Radiation-induced polymerization of ethylene in pilot plant. IV. Kinetic analysis

Journal Article · · J. Appl. Polym. Sci.; (United States)
; ; ; ; ; ;
The kinetics of the radiation-induced polymerization of ethylene in a flow system using tert-butyl alcohol aqueous solution as a medium were studied. The polymerization was carried out in a large-scale pilot plant with a 50-liter central source-type reactor at various mean residence times and dose rates under constant pressure of 300 kg/cm/sup 2/, temperature of 30/sup 0/C, and ethylene molar fraction of ca. 0.4. The reaction mixture in the reactor was back-mixed flow from the residual polymer concentration in the reactor. The results of the polymerization were analyzed by kinetic treatment based on a reaction mechanism with both first- and second-order terminations for the propagating radical. The apparent rate constants, except for that of second-order termination (k/sub t2/), were consistent with those determined by small-scale batch experiments. The k/sub t2/ is 20 to 40 times larger than that in the batch experiments. The k/sub t2/ increases with decrease in mean residence time and with agitation, probably because of mobility of the propagating radical. 8 figures, 1 table.
Research Organization:
Japan Atomic Energy Research Inst., Takasaki
OSTI ID:
5430807
Journal Information:
J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 25:2; ISSN JAPNA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360406* -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400302 -- Organic Chemistry-- Isotope Effects-- (-1987)
ALCOHOLS
ALKENES
BUTANOLS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHEMISTRY
ETHYLENE
FUNCTIONAL MODELS
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
PILOT PLANTS
POLYMERIZATION
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTION KINETICS