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(A–C) Transmittance, based on UV–Vis spectra, at 550 nm of aqueous solutions at various temperatures and values of pH for: (A) PNIPAAm97-co-PAA3; (B) PNIPAAm87-co-PAA13; and (C) PNIPAAm80-co-PAA20 random copolymers. (D) Corresponding LCSTs of aqueous PNIPAAm-co-PAA solutions at various values of pH.
