Small-angle scattering study on topological networks of poly(ethylene glycol) using catechol-based crosslinking
발표자
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초록
내용
Topological controls of polymer gels have been attention due to the defect controls and feasibility to develop novel materials. Here, the tetra-arm PEG macromers were prepared using catechol end groups that can produce various binding geometries, linear- and triangular-binding, by bis- and tris- complexation with iron cations. The structural aspects were explored using SAXS and SANS measurements. The contrast-variation SANS technique distinguished the macromer and binding units of the networks. The results revealed the isotropic geometrical structures based on linear bindings. Otherwise, the scattering patterns provided the results that the triangular bonds led to the distortion of the network. For the bis-complexation, the networks behave as the elastic-ball model, showing ξ ~ c-1/3. This study enhances the understanding of the network structures based on the geometries of crosslinking units.