Abstract
The dehydration and self-association of a novel thermosensitive diblock copolymer consisting of poly(2-isopropyl-2-oxazoline) and poly(N-isopropylacrylamide) (PIPOZ-b-PNIPAM) upon heating were studied in water and water–methanol (MeOH) mixtures by differential scanning calorimetry (DSC), turbidimetry, small-angle X-ray scattering (SAXS), and fluorescence depolarization. Although the difference of the phase-separation temperatures of the PIPOZ and PNIPAM homopolymers solutions was enhanced as the MeOH content in the mixed solvent increases, the DSC thermograms of PIPOZ-b-PNIPAM in water–MeOH mixtures were not bimodal, which indicates that the dehydration of each block does not occur independently. As a result, the amphiphilicity of this copolymer is weaker in the amphiphilic condition than that of the related thermosensitive block copolymer of PIPOZ and poly(2-ethyl-2-oxazoline) (PIPOZ-b-PEOZ) examined previously, which undergoes phase separation in hot water under the same conditions. Both PIPOZ-b-PNIPAM ...
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