Abstract
Polyacrylamide (PAM) and poly sodium acrylate (PNaA) homopolymer hydrogels and five kinds of P(AM-NaA) copolymer hydrogels with different monomer molar ratios AM/NaA were synthesized by 60Co-γ ray radiation polymerization in aqueous solutions. The micromorphologies of these hydrogel polymer samples were observed by a scanning electron microscope (SEM). From the interaction between the chain segments of polymers, it is qualitatively expounded that the cross-linking network structure of hydrogel polymers displayed successively the thicker framework network→incomplete bubble film network→dense network with the increase of NaA units in the hydrogel polymer chains. The non-homogeneity and complexity of micro network distribution of hydrogel polymers were elucidated by the multifractal theory. The results show that the multifractal spectrum, singular index α and Hausdorff dimension D0 can quantitatively characterize the non-homogeneity and the width of network distribution of hydrogel homopolymers and copolymers.
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