Evaluation of the length of primary chains in cross-linked poly(methacrylate)s

Two series of cross-linked polymers were examined by equilibrium different amounts swelling: Poly(methyl methacrylate) cross-linked with different amounts of triethylene gycol dimethacrylate and poly(urethane dimethacrylate)s derived from dicarbamates of oligoethylene monomethacrylates and aromatic diisocyanates. The method of estimation of the length of primary chains has been proposed based on the full form of the Flory-Rehner equation. This required comparing the network parameter values obtained by swelling and those derived from some other sources. In some cases whereas in others they appeared to be consistent. The latter for poly(urethane dimethacrylate)s yielded the length of poly(methacrylate) primary chains in the range of two to eight, which seemed to be a reasonable result..