Accelerating the Phase Separation in Aqueous Poly(N-isopropylacrylamide) Solutions by Slight Modification of the Polymer Stereoregularity: A Single Molecule Fluorescence Study
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- 作者：Takanori Tada ; Yukiteru Katsumoto ; Karel Goossens ; Hiroshi Uji-i ; Johan Hofkens ; Tatsuya Shoji ; Noboru Kitamura ; Yasuyuki Tsuboi
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：May 23, 2013
- 年：2013
- 卷：117
- 期：20
- 页码：10818-10824
- 全文大小：408K
- 年卷期：v.117,no.20(May 23, 2013)
- ISSN：1932-7455
文摘
We discovered for aqueous thermoresponsive polymer solutions that only a slight change in stereoregularity of the polymer can drastically accelerate phase separation. Single molecule fluorescence tracking (SMT) for an isotactic-slight-rich (meso-diad-rich) polymer sample solution revealed an interpolymer nanonetwork even before phase separation, and also revealed a novel phase in which translational molecular motion was frozen after phase separation. For such systems, fluorescence correlation spectroscopy (FCS) provided quantitative information on molecular diffusion. The results on FCS well agreed with the interpolymer nanonetwork model that was proposed on the basis of SMT measurement. We demonstrate such a novel method to control phase separation dynamics and also the interpolymer nanonetwork model.