RADIATION INDUCED POLYMERIZATION OF METHACRYLIC ACID IN SOLUTION (in Japanese)
In the polymerization of methacrylic acid in methanol solution, the rate of polymerization decreased as the polymerization temperature decreased in the range from -78 to +30 deg C. An apparent activation energy was calculated to be 3.6 kcal/mol. The rate of polymerization was proportional to 0.47 power of dose rate. Benzoquinone inhibited the polymerization. These results indicate that the polymerization proceeds by a free radical mechanism. The infrared spectrum and x-ray-diffraction diagram of polymethyl methacrylate prepared from esterification of polymethacrylic acid indicated that a syndyotactic polymer was obtained by low temperature polymerization. In the polymerization in methanol solution, the syndyotacticity increased as the polymerization temperature decreased, and (E/sub S/--E/sub I/), the difference of activation energy between syndyotactic and isotactic propagation, was calculated to be --0.5 kcal/mol. It was also found that the systemprecipitating polymers reduced the syndyotacticity. (from NSA of Japan)
- Research Organization:
- Government Industrial Research Inst., Nagoya, Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-017881
- OSTI ID:
- 4036123
- Journal Information:
- Chem. High Polymers (Tokyo), Journal Name: Chem. High Polymers (Tokyo) Vol. Vol: 20
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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Related Subjects
ARYL RADICALS
BENZOQUINONE
CATALYSIS
CHEMICAL REACTIONS
CHEMISTRY
CONFIGURATION
DIAGRAMS
DIFFRACTION
ENERGY
EQUATIONS
ESTERS
EXCITATION
FREE RADICALS
GAMMA RADIATION
INFRARED RADIATION
IRRADIATION
LOW TEMPERATURE
MEASURED VALUES
METHACRYLIC ACID
METHANOL
METHYL RADICALS
MOLECULES
NUMERICALS
PHOTOMETRY
POLYMERIZATION
POLYMERS
PRECIPITATION
QUINONES
RADIATION CHEMISTRY
REACTION KINETICS
SOLUTIONS
SPECTRA
SPECTROSCOPY
TABLES
TEMPERATURE
X RADIATION