RADIOCHEMICAL POLYMERIZATION OF STYRENE AT LOW TEMPERATURE IN THE PRESENCE OF BROMATED SOLVENTS (in French)
The radiochemical polymerization of styrene in ethyl bromide solution at -78 deg was studied by using high intensity radiation (45-kv x rays and gamma rays from a 10,000-C Co/sup 60/ source). In the presence of alr, the reaction has an induction period that is followed by great acceleration. This acceleration is interpreted by a supplementary polymerization started by the bromine released by the radiolysis. Under vacuum, the conversion curves are linear and the reaction is strongly inhibited by water. Experiments on the copolymerization of styrene with methyl methacrylate have shown that at the intensities used the reaction proceeds principally by a cation mechanism with, however, a slight contribution of a radical mechanism. The addition of bromoform to the ethyl bromide accelerates the polymerization. Some tests were also made by dissolving styrene in mixtures of bromobenzene or carbon tetrabromide with ethyl bromide and toluene. (tr-auth)
- Research Organization:
- C.N.R.S., Bellevue, France
- NSA Number:
- NSA-18-001748
- OSTI ID:
- 4158902
- Journal Information:
- Journal de Chimie Physique (France) Merged with Rev. Gen. Colloides to form J. Chim. Phys. Rev. Gen. Colloides, Journal Name: Journal de Chimie Physique (France) Merged with Rev. Gen. Colloides to form J. Chim. Phys. Rev. Gen. Colloides Vol. Vol: 60; ISSN JCPQA
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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Related Subjects
BENZENE
BOOKS
BROMIDES
BROMINATED HYDROCARBONS
BROMINE
BROMOFORM
CATIONS
CHEMICALS
CHEMISTRY
COBALT 60
COLOR
DECOMPOSITION
DIAGRAMS
EFFICIENCY
ELEMENTS
ENERGY LEVELS
ETHYL RADICALS
EXCITATION
GAMMA RADIATION
INTERNAL CONVERSION
LOW TEMPERATURE
METHACRYLIC ACID
METHYL RADICALS
MINERAL ACIDS
OPERATION
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
POLYMERIZATION
PREPARATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RADIATION CHEMISTRY
RADIOLYSIS
REACTION KINETICS
SEPARATION PROCESSES
SOLVENT EXTRACTION
STYRENE
TERBIUM 159
TITRATION
TOLUENE
TRANSIENTS
USES
VACUUM
WATER
X RADIATION