Minimization of spatial inhomogeneity in polystyrene gels formed by free-radical mechanism |
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Authors: | Handan Cerid |
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Affiliation: | Department of Chemistry, Istanbul Technical University, Maslak, 80626 Istanbul, Turkey |
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Abstract: | The spatial inhomogeneity in polystyrene (PS) gels has been investigated with the static light scattering technique. PS gels were prepared starting from styrene monomer and ethylene glycol dimethacrylate crosslinker in a homogeneous solution. The gel synthesis parameters varied were the crosslinker concentration, the primary chains length and the quality of the polymerization solvent. The gels were characterized by elasticity tests as well as by light scattering measurements at a gel state just after their preparation. The degree of spatial gel inhomogeneity decreased with decreasing crosslinker content, with decreasing primary chain length or, with increasing quality of the polymerization solvent. It was shown that the gel synthesis parameters varied mainly affect the distance between the pendant vinyl groups locating on the same macromolecule during the gel formation process. Increasing the distance between the pendant vinyl groups reduces the rate of the multiple crosslinking reactions so that the resulting PS gels exhibit a lesser degree of inhomogeneity. |
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Keywords: | Polystyrene gels Inhomogeneity Static light scattering Elastic modulus Multiple crosslinking |
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