In situ observation of swelling ratio of polymer thin films was performed using a temperature-controlled custom-made chamber mounted on the ellipsometry, as described in the Supplementary Materials. After PS, P2VP, and PS-b-P2VP thin films were placed in the chamber, thickness variation was monitored at constant time intervals of 30 s. The surface-to-volume ratio of exposed solvent is 0.09 to 0.12 cm−1.

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