ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Radiation-induced polymerization of 2-methyl-5-vinylpyridine was investigated in bulk in the temperature region of 50 to -196°C. The activation energy was found to be 5.7 kcal./mole for the liquid-phase polymerization and 0.3 kcal./mole for the solidphase polymerization. It was observed that the rate of polymerization is proportional to the square root of the dose rate in the liquid-phase polymerization and is proportional to the dose rate in the solid-phase polymerization. DPPH and benzoquinone inhibited strongly the liquid-phase polymerization, while the same inhibitors did not inhibit appreciably the solid-phase polymerization. On the other hand, the solid-phase polymerization was completely inhibited by acetone, pyridine, and methanol, while the liquid-phase polymerization was not inhibited by the same additives. It was concluded that the polymerization in the liquid phase proceeds by a radical mechanism and the polymerization in the solid phase proceeds by a nonradical mechanism, probably an ionic or electronic mechanism.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020822
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