Radiation-induced polymerization of vinyl monomers adsorbed on inorganic substances. VI. Temperature dependence and effects of additives on methyl methacrylate--silica gel system. [Reaction mechanism;. gamma. radiation]
To elucidate the reaction mechanism of radiation-induced polymerization of methylmethacrylate adsorbed on silica gel, the temperature dependence and effects of acetone and pyridine were investigated. It was found that even at -78/sup 0/C the polymerization rate was quite fast. The amounts of high molecular weight GPC peaks of both graft polymers and homopolymers in creased with increasing irradiation temperature. The activation energy of the adsorbed state polymerization was low compared with that of bulk polymerization. The low molecular weight peaks of homopolymers decreased with acetone addition but were almost unaffected by pyridine. The low molecular weight peaks of homopolymers were thus polymerized by an anionic mechanism. In the methyl methacrylate-silica gel system both radical and anionic polymerization take place at the same time in formation of graft polymers and homopolymers. A reaction mechanism for the methyl methacrylate-silica gel system was proposed based on the results obtained to date.
- Research Organization:
- Japan Atomic Energy Research Inst., Takasaki
- OSTI ID:
- 7226615
- Journal Information:
- J. Polym. Sci.; (United States), Vol. 14
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
METHYL METHACRYLATE
CHEMICAL RADIATION EFFECTS
SILICA GEL
SORPTIVE PROPERTIES
ACETONE
ADSORPTION
GAMMA RADIATION
LOW TEMPERATURE
POLYMERIZATION
PYRIDINE
REACTION KINETICS
TEMPERATURE EFFECTS
ADSORBENTS
AZINES
CARBOXYLIC ACID ESTERS
CHEMICAL REACTIONS
CHEMISTRY
ELECTROMAGNETIC RADIATION
ESTERS
HETEROCYCLIC COMPOUNDS
IONIZING RADIATIONS
KETONES
KINETICS
METHACRYLIC ACID ESTERS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SORPTION
SURFACE PROPERTIES
400600* - Radiation Chemistry
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)