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(a) Hydrogel amount (HG) values and equilibrium swelling ratio (ESR) values of the PVP hydrogel formed on the HPEB90C10 film as a function of (a) the hexane treatment time, (b) PVP concentration, (c) EGDMA concentration. Water contact angle values of PVP hydrogel-modified HPEB90C10 as a function of (d) the hexane treatment time, (e) PVP concentration, (f) EGDMA concentration.
