Abstract
The crosslinking of poly(vinyl alcohol) beads was performed by γ-ray irradiation. The maximum molecular size, M lim, which can permeate through beads, was obtained by eluting poly(ethylene glycol) through a column packed with beads. The root-mean-square of the end-to-end distance ( r 2 ) 1 2 and that of the hydrodynamic radius ( s 2 ) 1 2 were also calculated. Meanwhile, the average size of the network of the beads, r c, was estimated from the average molecular weight between crosslinkages, M c, which was derived from the glass transition temperatures of crosslinked and non-crosslinked poly(vinyl alcohol) beads. r c values of poly(vinyl alcohol) beads decreased as the total dose of γ-irradiation increased when dry poly(vinyl alcohol) beads were γ-irradiated, while the values were almost constant when poly(vinyl alcohol) beads swollen in water were γ-irradiated. Further, linear relations were obtained among r c, ( r 2 ) 1 2 , and ( s 2 ) 1 2 covering the wide range of total dose.
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