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Network parameters and scaling behaviour of chemically crosslinked hydrogels of poly[(N,N-dimethylacrylamide)-co-(methyl methacrylate)]

✍ Scribed by Yan Liu; Runsheng Mao; Malcolm B. Huglin; Paul A. Holmes

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
551 KB
Volume
198
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

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 ϕ~2~ 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 ∝ ϕ 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).

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