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RADIATION INDUCED POLYMERIZATION OF METHACRYLIC ACID IN SOLUTION (in Japanese)

Journal Article · · Chem. High Polymers (Tokyo)

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