Structural study on the UCST-type phase separation of poly(N -isopropylacrylamide) in ionic liquid

Hanako Asai; Kenta Fujii; Takeshi Ueki; Shota Sawamura; Yutaro Nakamura; Yuzo Kitazawa; Masayoshi Watanabe; Young Soo Han; Tae Hwan Kim; Mitsuhiro Shibayama

doi:10.1021/ma3020273

Structural study on the UCST-type phase separation of poly(N -isopropylacrylamide) in ionic liquid

Hanako Asai
, Kenta Fujii^*
, Takeshi Ueki
, Shota Sawamura
, Yutaro Nakamura
, Yuzo Kitazawa
, Masayoshi Watanabe
, Young Soo Han
, Tae Hwan Kim
, Mitsuhiro Shibayama

^*Corresponding author for this work

Department of Quantum System Engineering

The University of Tokyo
Yokohama National University
Korea Atomic Energy Research Institute

Research output: Contribution to journal › Journal article › peer-review

32 Scopus citations

Abstract

Upper critical solution temperature (UCST)-type phase separation behavior and its conformational change of well-defined poly(N-isopropylacrylamide) (pNIPAm) in deuterated room-temperature ionic liquid (IL), 1-ethyl-3- methylimidazolium bis(trifluoromethanesulfonyl)amide (d₈-[C ₂mIm⁺][TFSA^-]), were investigated by means of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) measurements. From the temperature dependence of time-averaged scattering intensity obtained by DLS, it was found that the cloud points of pNIPAm/d ₈-[C₂mIm⁺][TFSA^-] solutions increased with molecular weight (M_w) and concentration. In addition, it was found that there are two relaxation modes of pNIPAm in the IL solutions. From SANS measurements, the radius of gyration, R_g, and the Flory-Huggins interaction parameter, χ, were evaluated as a function of temperature during the phase separation.

Original language	English
Pages (from-to)	1101-1106
Number of pages	6
Journal	Macromolecules
Volume	46
Issue number	3
DOIs	https://doi.org/10.1021/ma3020273
State	Published - 2013.02.12

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@article{0466f117fe38471ba40b892bd5a0057a,

title = "Structural study on the UCST-type phase separation of poly(N -isopropylacrylamide) in ionic liquid",

abstract = "Upper critical solution temperature (UCST)-type phase separation behavior and its conformational change of well-defined poly(N-isopropylacrylamide) (pNIPAm) in deuterated room-temperature ionic liquid (IL), 1-ethyl-3- methylimidazolium bis(trifluoromethanesulfonyl)amide (d8-[C 2mIm+][TFSA-]), were investigated by means of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) measurements. From the temperature dependence of time-averaged scattering intensity obtained by DLS, it was found that the cloud points of pNIPAm/d 8-[C2mIm+][TFSA-] solutions increased with molecular weight (Mw) and concentration. In addition, it was found that there are two relaxation modes of pNIPAm in the IL solutions. From SANS measurements, the radius of gyration, Rg, and the Flory-Huggins interaction parameter, χ, were evaluated as a function of temperature during the phase separation.",

author = "Hanako Asai and Kenta Fujii and Takeshi Ueki and Shota Sawamura and Yutaro Nakamura and Yuzo Kitazawa and Masayoshi Watanabe and Han, \{Young Soo\} and Kim, \{Tae Hwan\} and Mitsuhiro Shibayama",

year = "2013",

month = feb,

day = "12",

doi = "10.1021/ma3020273",

language = "English",

volume = "46",

pages = "1101--1106",

journal = "Macromolecules",

issn = "0024-9297",

number = "3",

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TY - JOUR

T1 - Structural study on the UCST-type phase separation of poly(N -isopropylacrylamide) in ionic liquid

AU - Asai, Hanako

AU - Fujii, Kenta

AU - Ueki, Takeshi

AU - Sawamura, Shota

AU - Nakamura, Yutaro

AU - Kitazawa, Yuzo

AU - Watanabe, Masayoshi

AU - Han, Young Soo

AU - Kim, Tae Hwan

AU - Shibayama, Mitsuhiro

PY - 2013/2/12

Y1 - 2013/2/12

N2 - Upper critical solution temperature (UCST)-type phase separation behavior and its conformational change of well-defined poly(N-isopropylacrylamide) (pNIPAm) in deuterated room-temperature ionic liquid (IL), 1-ethyl-3- methylimidazolium bis(trifluoromethanesulfonyl)amide (d8-[C 2mIm+][TFSA-]), were investigated by means of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) measurements. From the temperature dependence of time-averaged scattering intensity obtained by DLS, it was found that the cloud points of pNIPAm/d 8-[C2mIm+][TFSA-] solutions increased with molecular weight (Mw) and concentration. In addition, it was found that there are two relaxation modes of pNIPAm in the IL solutions. From SANS measurements, the radius of gyration, Rg, and the Flory-Huggins interaction parameter, χ, were evaluated as a function of temperature during the phase separation.

AB - Upper critical solution temperature (UCST)-type phase separation behavior and its conformational change of well-defined poly(N-isopropylacrylamide) (pNIPAm) in deuterated room-temperature ionic liquid (IL), 1-ethyl-3- methylimidazolium bis(trifluoromethanesulfonyl)amide (d8-[C 2mIm+][TFSA-]), were investigated by means of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) measurements. From the temperature dependence of time-averaged scattering intensity obtained by DLS, it was found that the cloud points of pNIPAm/d 8-[C2mIm+][TFSA-] solutions increased with molecular weight (Mw) and concentration. In addition, it was found that there are two relaxation modes of pNIPAm in the IL solutions. From SANS measurements, the radius of gyration, Rg, and the Flory-Huggins interaction parameter, χ, were evaluated as a function of temperature during the phase separation.

UR - https://www.scopus.com/pages/publications/84873696206

U2 - 10.1021/ma3020273

DO - 10.1021/ma3020273

M3 - Journal article

AN - SCOPUS:84873696206

SN - 0024-9297

VL - 46

SP - 1101

EP - 1106

JO - Macromolecules

JF - Macromolecules

IS - 3

ER -

Structural study on the UCST-type phase separation of poly(N -isopropylacrylamide) in ionic liquid

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