ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Copolymerization of N,N-dimethylacrylamide (DMA) with methyl methacrylate in both the presence and absence of ethylene dimethacrylate (EDMA) was effected to very high conversion by γ-irradiation. The resultant xerogels were swollen to equilibrium in water at five specific temperatures within the interval 280.2-338.2 K. The volume fractions of the polymer φ2 in the hydrogels were determined from the measured dimensions, and compression-strain measurements yielded the polymer-water interaction parameter, the effective crosslinking densities, and Young's moduli Y. The observed dependence of these parameters on copolymer composition and content of EDMA is discussed. A scaling law of the form Y ∝ φr2 is obeyed well by hydrogels of xerogels containing 80 wt.-% DMA (r = 2.37 ± 0.10) and moderately well by hydrogels of xerogels with only 50 wt.-% DMA (r = 2.54 ± 0.10).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1997.021980617
