抄録
We reported here the full characterization of the hysteresis of the phase transition behavior of an aqueous solution of poly(N-ethyl-2- propionamidoacrylamide) (PNEPA), which has a unique α,α- disubstituted structure, by using microcalorimetry and FT-IR. Phase transition temperatures near the thermodynamic equilibrium were determined by extrapolating the scanning rate of the microcalorimetry to zero. The calculated hysteresis from the phase transition temperature was unusually very large (∼8 °C). FT-IR analysis indicated that the large hysteresis of PNEPA resulted from a coupling of intra-/intermonomeric unit hydrogen bonds, which is known to occur in a Β-sheet of proteins but has never been reported in temperature-responsive polymers. The effects of the molecular weight and polymer concentration on the hysteresis were studied by using fractionated PNEPAs and it was found that a low molecular weight and a low concentration enhanced the hysteresis.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 7784-7790 |
| ページ数 | 7 |
| ジャーナル | Journal of Physical Chemistry B |
| 巻 | 114 |
| 発行部数 | 23 |
| DOI | |
| 出版物ステータス | 出版済み - 6 17 2010 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry
これを引用
Unusually Large Hysteresis of Temperature-Responsive Poly(N-ethyl-2- propionamidoacrylamide) Studied by Microcalorimetry and FT-IR. / Berber, Mohamed R.; Mori, Hironori; Hafez, Inas H.; Minagawa, Keiji; Tanaka, Masami; Niidome, Takuro; Katayama, Yoshiki; Maruyama, Atsushi; Hirano, Tomohiro; Maeda, Yasushi; Mori, Takeshi.
：: Journal of Physical Chemistry B, 巻 114, 番号 23, 17.06.2010, p. 7784-7790.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Unusually Large Hysteresis of Temperature-Responsive Poly(N-ethyl-2- propionamidoacrylamide) Studied by Microcalorimetry and FT-IR
AU - Berber, Mohamed R.
AU - Mori, Hironori
AU - Hafez, Inas H.
AU - Minagawa, Keiji
AU - Tanaka, Masami
AU - Niidome, Takuro
AU - Katayama, Yoshiki
AU - Maruyama, Atsushi
AU - Hirano, Tomohiro
AU - Maeda, Yasushi
AU - Mori, Takeshi
PY - 2010/6/17
Y1 - 2010/6/17
N2 - We reported here the full characterization of the hysteresis of the phase transition behavior of an aqueous solution of poly(N-ethyl-2- propionamidoacrylamide) (PNEPA), which has a unique α,α- disubstituted structure, by using microcalorimetry and FT-IR. Phase transition temperatures near the thermodynamic equilibrium were determined by extrapolating the scanning rate of the microcalorimetry to zero. The calculated hysteresis from the phase transition temperature was unusually very large (∼8 °C). FT-IR analysis indicated that the large hysteresis of PNEPA resulted from a coupling of intra-/intermonomeric unit hydrogen bonds, which is known to occur in a Β-sheet of proteins but has never been reported in temperature-responsive polymers. The effects of the molecular weight and polymer concentration on the hysteresis were studied by using fractionated PNEPAs and it was found that a low molecular weight and a low concentration enhanced the hysteresis.
AB - We reported here the full characterization of the hysteresis of the phase transition behavior of an aqueous solution of poly(N-ethyl-2- propionamidoacrylamide) (PNEPA), which has a unique α,α- disubstituted structure, by using microcalorimetry and FT-IR. Phase transition temperatures near the thermodynamic equilibrium were determined by extrapolating the scanning rate of the microcalorimetry to zero. The calculated hysteresis from the phase transition temperature was unusually very large (∼8 °C). FT-IR analysis indicated that the large hysteresis of PNEPA resulted from a coupling of intra-/intermonomeric unit hydrogen bonds, which is known to occur in a Β-sheet of proteins but has never been reported in temperature-responsive polymers. The effects of the molecular weight and polymer concentration on the hysteresis were studied by using fractionated PNEPAs and it was found that a low molecular weight and a low concentration enhanced the hysteresis.
UR - http://www.scopus.com/inward/record.url?scp=77953396459&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77953396459&partnerID=8YFLogxK
U2 - 10.1021/jp102681q
DO - 10.1021/jp102681q
M3 - Article
C2 - 20499912
AN - SCOPUS:77953396459
VL - 114
SP - 7784
EP - 7790
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 23
ER -