Radiation-induced polymerization of water-saturated styrene in a wide range of dose rate. [Oligomers and super polymers]
Radiation-induced polymerization of water-saturated styrene (water content 3.5 x 10/sup -2/ mole/liter) was carried out in a wide range of dose rate between 1.2 x 10/sup 3/ and 1.8 x 10/sup 7/ rad/sec, and compared with the polymerization of the moderately dried styrene (water content 3.2 x 10/sup -3/ mole/liter). Molecular weight distribution curves of the polymerization products showed that they were generally consisted of four parts, namely, oligomers, radical, cationic, and super polymers. Contributions of the four constituents to the polymerization and the number average degrees of polymerization (DP) of the four kinds of polymers were calculated by the graphical analysis of the curves. The rate of radical polymerization and DP of radical polymers are independent of the water content; the dose rate dependences of the polymerization rate and DP agree with the well known square root and inverse square root laws, respectively, of the radical polymerization of styrene. The rate of ionic polymerization is directly proportional to the dose rate, but it decreases, at a given dose rate, inversely proportional to the water content of styrene. DP of ionic polymer is independent of the dose rate but decreases with increasing water content. The super polymer of DP about 10/sup 4/ is not formed in the case of the moderately dried styrene. G values for the initiating radical and ion formation are calculated to be independently of the dose rate and water content, 0.66 and 0.027, respectively. It was suggested that oligomer was formed in the early stage by the interaction of cation with anion and only those cations which had survived underwent polymerization. 10 figures, 4 tables.
- Research Organization:
- Japan Atomic Energy Research Inst., Osaka
- OSTI ID:
- 6425682
- Journal Information:
- J. Appl. Polym. Sci.; (United States), Vol. 22:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STYRENE
CHEMICAL RADIATION EFFECTS
CATIONS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DISTRIBUTION
DOSE RATES
GAMMA RADIATION
MOLECULAR WEIGHT
ORGANIC POLYMERS
POLYMERIZATION
RADICALS
WATER SATURATION
AROMATICS
CHARGED PARTICLES
CHEMISTRY
ELECTROMAGNETIC RADIATION
HYDROCARBONS
IONIZING RADIATIONS
IONS
KINETICS
ORGANIC COMPOUNDS
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
REACTION KINETICS
YIELDS
400600* - Radiation Chemistry