ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The effect of phases, viz., a crystalline, a glassy, and a supercooled liquid state, on the cyclopolymerization of N-substituted dimethacrylamides 1, initiated by ionizing radiation, was examined. In both the crystalline and supercooled liquid states, 1 was polymerized to give completely cyclized polymers, whereas no polymerization occurred in the glassy state. The structural investigations showed that the polymerization in the supercooled liquid state afforded polymers with the same structure as that of polymers formed in the liquid state, while the polymerization in the crystalline state yielded polymers with some difference in structure. Irrespective of the matrices where polymerizations were carried out, poly(1) obtained are amorphous, and the rate determining step was found to be an intramolecular cyclization reaction, by ESR spectra of propagating radicals. The results thus obtained suggest that the polymerizations of dimethacrylamides 1 in the solid and supercooled liquid states proceed through a virtually identical mechanism with that developed for the polymerization in the liquid state, but the matrices influence the polymerization process to some extent.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1978.021790714
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