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- W4284891444 abstract "Abstract The collective dynamics of 25 wt% poly( N -isopropylacrylamide) (PNIPAM) solutions in water or an 80:20 v/v water/methanol mixture are investigated in the one-phase region in dependence on pressure and temperature using dynamic light scattering. Throughout, two dynamic modes are observed, the fast one corresponding to the relaxation of the chain segments within the polymer blobs and the slow one to the relaxation of the blobs. A pressure scan in the one-phase region on an aqueous solution at 34.0 °C, i.e., slightly below the maximum of the coexistence line, reveals that the dynamic correlation length of the fast mode increases when the left and the right branch of the coexistence line are approached. Thus, the chains are rather swollen far away from the coexistence line, but contracted near the phase transition. Temperature scans of solutions in neat H 2 O or in H 2 O/CD 3 OD at 0.1, 130, and 200 MPa reveal that the dynamic correlation length of the fast mode shows critical behavior. However, the critical exponents are significantly larger than the value predicted by mean-field theory for the static correlation length, ν = 0.5, and the exponent is significantly larger for the solution in the H 2 O/CD 3 OD mixture than in neat H 2 O." @default.
- W4284891444 created "2022-07-09" @default.
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- W4284891444 date "2022-07-08" @default.
- W4284891444 modified "2023-09-25" @default.
- W4284891444 title "Cononsolvency of the responsive polymer poly(N-isopropylacrylamide) in water/methanol mixtures: a dynamic light scattering study of the effect of pressure on the collective dynamics" @default.
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- W4284891444 doi "https://doi.org/10.1007/s00396-022-04987-x" @default.
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