ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Polystyrene and poly(methyl methacrylate) were swelled with the respective monomers and with suitable organic solvents. By means of a special experimental arrangement the spin-lattice relaxation times of the protons of the swelling agent and of those of the swelled polymer were measured separately. Differences between the spin-lattice relaxation time of the polymer during polymerization and that of the polymer swelled by the monomer are revealed and seem to point out a different degree of mobility in the polymer chains. In some instances an indication of differences in the motions that produce the relaxation is gained from the observed differences in the behavior of a polymer obtained through thermal polymerization and that of the same polymer obtained by ultraviolet radiation-induced polymerization. With regard to the swelling agent there is also some experimental evidence pointing out the remarkable role taken by internal rotations of molecular groups in the mechanism of relaxation.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020644
Permalink
