High pressure effects under phase separation of aqueous solutions of poly (N-isopropylacryamide): A HS-DSC studyстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 17 ноября 2015 г.
Аннотация:The phase separation of aqueous solutions of poly(N-isopropylacrylamide) at different pressures (up to 212 MPa) has been first investigated by high-sensitivity differential scanning calorimetry (HS-DSC). The dependences of the transition temperature, enthalpy and width on pressure have been determined. Upon increasing pressure, the transition temperature passes through a maximum, the enthalpy decreases and the thermodynamic width of the transition notably increases. The transition increment of partial volume of the polymer (Dtv) is found to be positive at low pressures and negative at high ones. The positivity of the increment Dtv points to a significant role of hydrophobic hydration in the transition mechanism. The negativity of Dtv can be related to domination of the interchain H-bond formation upon the system phase
separation. The transition width increase reflects changes in the shape of the system binodal.