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>Light‐scattering studies on solutions of high and low molecular weight polystyrene mixtures used as models of microgel‐containing solutions
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Light‐scattering studies on solutions of high and low molecular weight polystyrene mixtures used as models of microgel‐containing solutions
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机译：Light‐scattering studies on solutions of high and low molecular weight polystyrene mixtures used as models of microgel‐containing solutions
AbstractDiluted solutions of linear polystyrene (PS) in toluene and dioxane were studied by the light‐scattering method. The solutes were mixtures of high‐M̄wand low M̄wPS. The dissolved PS mixtures were regarded as polymer solutions containing microgels, the high‐M̄wPS being looked upon as the microgel counterpart. The calculation method as proposed by Strazielle1and Burchard2was used to evaluate the microgel percentage and particle size, whereby the method could be verified against mixtures with well‐known weight composition anddocumentclass{article}pagestyle{empty}begin{document}$ overline {left( {r_g ^2 } right)} ^{{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} $end{document}. Thedocumentclass{article}pagestyle{empty}begin{document}$ overline {left( {r_g ^2 } right)} ^{{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} $end{document}values evaluated for the mixtures from the experimental data were compared with those estimated from the molecular weights of the components, their weight concentrations, and theirdocumentclass{article}pagestyle{empty}begin{document}$ overline {left( {r_g ^2 } right)} ^{{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} $end{document}values. The method1,2was found to be useful for evaluating the microgel content in a sample, but not fordocumentclass{article}pagestyle{empty}begin{document}$ overline {left( {r_g ^2 } right)} ^{{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} $end{document}values as calculated by Guinier's procedure nor those calculated by Zimm's procedure; the former were low and the latter were even incongruous. A comparative analysis of the theoretical functionP−1(θ)‐versus‐sin2(θ/2) and experimental (Kc/R(θ))c=0‐versus‐sin2(θ/2) curves allowed to discuss the effect of the course of these curves at samll angles from 0° to 30° on M̄wanddocumentclass{article}pagestyle{empty}begin{document}$ overline {left( {r_g ^2 } right)} ^{{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} $end{document}as determined for the high and low molecular weight polystyrene mix
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