ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Some recent observations on the behavior of radicals in solid and near-solid media are reviewed. Polymerization in a matrix of swollen polymer molecules is first discussed, and this is followed by a consideration of the photochemical polymerization of crystalline methacrylic acid as studied by electron spin resonance, optical microscopy, and kinetics methods. The behavior of radicals produced on crystal faces was also investigated, and it is suggested that their behavior may be explained by assuming that their energies of interaction with the surface cover a wide range and that, on raising the temperature, propagation and termination reactions occur. Two types of polymer were produced by bulk polymerization of the crystals, one clear and glassy, the other fibrous or granular; both were amorphous and not oriented, and it was concluded that the crystal lattice exerted no influence on the configuration of the polymer produced from it. The reaction seems to proceed by a phase boundary process rather than by propagation through the lattice.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204815005
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