Study of radiation-induced polymerization of vinyl monomers adsorbed on inorganic substances. IX. Preirradiation polymerization of styrene--silica gel system

Journal Article · Thu Jan 01 00:00:00 EST 1976 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1976.170140910· OSTI ID:7311253

Fukano, K; Kageyama, E

Preirradiation polymerization of the styrene-silica gel system was studied in detail. Both graft polymers and homopolymers have bimodal GPC spectra. High molecular weight peaks were formed in a radical mechanism and the low molecular weight peaks were formed in a cationic mechanism as same as those in the simultaneous irradiation polymerization. The rate of formation of the low molecular weight peaks was very high compared with that of the high molecular weight peaks. Monomer conversion and percent grafting leveled off at about 1--2 Mrad. Radiation dose dependence of the four peaks were different from each other. Monomer conversion and percent grafting decreased as the preheating temperature of silica gel increased. The amount of the low molecular weight peaks of graft polymers depended on the number of silanol groups, as in the case of the simultaneous irradiation polymerization. A reaction mechanism for the preirradiation polymerization is proposed based on the results obtained.

• Research Organization: Japan Atomic Energy Research Inst., Takasaki, Gunma
• OSTI ID: 7311253
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Vol. 14
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
STYRENE
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
GRAFT POLYMERS
POLYMERIZATION
SILICA GEL
ADSORBENTS
AROMATICS
CHEMICAL REACTIONS
CHEMISTRY
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTION KINETICS
400600* - Radiation Chemistry