Study of radiation-induced polymerization of vinyl monomers adsorbed on inorganic substances. X. Influence of H/sub 2/O on the styrene-silica gel system. [. gamma. rays]

Journal Article · Sat Jan 01 04:00:00 EST 1977 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1977.170150107· OSTI ID:5376791

Fukano, K; Kageyama, E

To elucidate the reaction mechanism of radiation-induced polymerization of the styrene--silica gel system, the influence of H/sub 2/O as adsorbed water and inhibitor of cationic polymerization was investigated by two methods. Monomer conversion decreased as H/sub 2/O increased. In general, percent grafting decreased as H/sub 2/O increased, but the presence of a small amount of H/sub 2/O increased the percent grafting. Grafting at 16 Mrad has a maximum value at a water content of about 0.2 percent. This seems to be due to two effects of H/sub 2/O: percent grafting increases due to restraint of cationic polymerization by H/sub 2/O, but the percent grafting decreases due to adsorption water which interrupts the contact of styrene with silica gel. In GPC spectra, the low molecular weight peaks of both graft polymers and homopolymers decreased when H/sub 2/O was added. The GPC results suggest that the number of positive holes which initiate cationic polymerization is very large.

• Research Organization: Japan Atomic Energy Research Inst., Takasaki
• OSTI ID: 5376791
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 15:1; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ADSORBENTS
AROMATICS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
HYDROCARBONS
IONIZING RADIATIONS
ORGANIC COMPOUNDS
POLYMERIZATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SILICA GEL
STYRENE