Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels
Publication type: Journal Article
Publication date: 1997-05-01
scimago Q1
wos Q1
SJR: 1.352
CiteScore: 9.0
Impact factor: 5.2
ISSN: 00249297, 15205835
Materials Chemistry
Organic Chemistry
Inorganic Chemistry
Polymers and Plastics
Abstract
Structural cooperative transitions in thermosensitive nonionic hydrogels of poly(N-vinylcaprolactam) (PVCa) were studied using high-sensitivity differential scanning calorimetry (HS-DSC). The thermoshrinking of the PVCa gel is endothermic, much like first-order phase transitions. According to the HS-DSC data, the gel system undergoes two successive cooperative transitions between 25 and 50 °C. The low-temperature transition (31.5 °C) is proposed to be associated with the microsegregation resulting in formation of hydrophobic domains (micromicelles) in the gel whereas the high-temperature transition (37.6 °C) is due to the gel volume collapse. The transition temperatures decrease in the presence of NaCl and increase with increasing sodium dodecyl sulfate (SDS) concentration. Dependences of the transition enthalpies and entropies on NaCl and SDS concentrations display a more complex character. The influence of sodium chloride and SDS on the transition temperatures is in agreement with the general expectatio...
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123
Total citations:
123
Citations from 2024:
1
(0.81%)
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GOST
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Mikheeva L. M. et al. Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels // Macromolecules. 1997. Vol. 30. No. 9. pp. 2693-2699.
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Mikheeva L. M., Grinberg N. V., Mashkevich A. Ya., Manucha W., Thanh L. T. M., Makhaeva E. E., Khokhlov A. R. Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels // Macromolecules. 1997. Vol. 30. No. 9. pp. 2693-2699.
Cite this
RIS
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TY - JOUR
DO - 10.1021/ma9615112
UR - https://doi.org/10.1021/ma9615112
TI - Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels
T2 - Macromolecules
AU - Mikheeva, Larisa M
AU - Grinberg, Natalia V
AU - Mashkevich, Alexander Ya
AU - Manucha, Walter
AU - Thanh, Le Thi Minh
AU - Makhaeva, Elena E.
AU - Khokhlov, Alexei R.
PY - 1997
DA - 1997/05/01
PB - American Chemical Society (ACS)
SP - 2693-2699
IS - 9
VL - 30
SN - 0024-9297
SN - 1520-5835
ER -
Cite this
BibTex (up to 50 authors)
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@article{1997_Mikheeva,
author = {Larisa M Mikheeva and Natalia V Grinberg and Alexander Ya Mashkevich and Walter Manucha and Le Thi Minh Thanh and Elena E. Makhaeva and Alexei R. Khokhlov},
title = {Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels},
journal = {Macromolecules},
year = {1997},
volume = {30},
publisher = {American Chemical Society (ACS)},
month = {may},
url = {https://doi.org/10.1021/ma9615112},
number = {9},
pages = {2693--2699},
doi = {10.1021/ma9615112}
}
Cite this
MLA
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Mikheeva, Larisa M., et al. “Microcalorimetric study of thermal cooperative transitions in poly(N-vinylcaprolactam) hydrogels.” Macromolecules, vol. 30, no. 9, May. 1997, pp. 2693-2699. https://doi.org/10.1021/ma9615112.
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