期刊
COLLOID AND POLYMER SCIENCE
卷 288, 期 14-15, 页码 1457-1463出版社
SPRINGER
DOI: 10.1007/s00396-010-2282-y
关键词
Thermosensitive polymers; Hydration number; Hydrophobicity; Millimeter-wave microwave; Heat capacity
资金
- RFBR [07-03-00131]
Water molecules in the polymer hydration shell known as bound water lose their mobility in comparison with unperturbed water. This effect was quantified by absorption measurements in the millimeter-wave range of microwaves (1-10 mm, 30-300 GHz). Hydration measurements were performed for poly(N-vinylcaprolactam) (PNVCL) and copolymers of N-vinylcaprolactam (NVCL) and N-vinylimidazol (NVIA). The association of hydrophobic groups in PNVCL upon coil-to-globule transition was found to cause a decrease in the relative hydration number, which is the relative amount of bound water per solute molecule as measured by microwave method at 31 GHz. Millimeter-wave hydration measurements were confirmed by the determinations of specific heat capacity (c (p)) with differential scanning calorimetry. Hydration determinations of NVCL/NVIA copolymers revealed that they associate via hydrophobic clustering with a decrease in hydration of hydrophobic groups.
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