Ring polystyrenes (PSs) were synthesized by anionic polymerization technique and purified with preparative size-exclusion chromatography (SEC). Seven ring PSs with their weight-average molecular weight (M w) ranging from 17k to 570k were prepared and they were confirmed to have high purities all over 96% by liquid chromatography at the chromatographic critical condition (LCCC) analyses. Their radii of gyration (R gs) were determined in benzene-d 6 as a good solvent and in cyclohexane-d 12 or cyclohexane-h 12 as θ solvents by small-angle neutron scattering (SANS) or light scattering (LS). It has been found that R gs of ring polymers are scaled with M w as R g∝ w 0.60 in a good solvent and as R g∝ w 0.53 in θ solvents. Moreover it was confirmed that g factors, R g 2 (Ring)/R g 2 (Linear), obtained in θ solvents are meaningfully larger than theoretically predicted values owing to the topological effect stored in ring molecules.
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