Asymmetric swelling and self-assembly of poly(N-isopropyl-acrylamide)-block-poly(ethylene glycol) in water

R. Motokawa; K. Morishita; S. Koizumi; E. Yoshimoto; M. Annaka

doi:10.1016/j.physb.2006.06.050

Asymmetric swelling and self-assembly of poly(N-isopropyl-acrylamide)-block-poly(ethylene glycol) in water

R. Motokawa, K. Morishita, S. Koizumi, E. Yoshimoto, M. Annaka

Physical Chemistry

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

This investigation focused on the self-assembly of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (PNIPA-b-PEG) in water. We distinguish four regions in the phase diagram: a transparent sol, opaque sol, opaque gel, and syneresis. Small-angle neutron scattering measurements revealed that microphase separation occurs above 17 ^{{ring operator}} C to form disordered micelles, which includes a range of states from (i) asymmetric swelling to (ii) micelle formation with only short-range liquid-like order. This result may be attributed to the action of water, which starts to behave as a selective solvent for PEG blocks; the PEG chains are more swollen with water than are the PNIPA chains.

Original language	English
Pages (from-to)	745-748
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	385-386 I
DOIs	https://doi.org/10.1016/j.physb.2006.06.050
Publication status	Published - Nov 27 2006

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Asymmetric swelling and self-assembly of poly(N-isopropyl-acrylamide)-block-poly(ethylene glycol) in water",

abstract = "This investigation focused on the self-assembly of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (PNIPA-b-PEG) in water. We distinguish four regions in the phase diagram: a transparent sol, opaque sol, opaque gel, and syneresis. Small-angle neutron scattering measurements revealed that microphase separation occurs above 17 {ring operator} C to form disordered micelles, which includes a range of states from (i) asymmetric swelling to (ii) micelle formation with only short-range liquid-like order. This result may be attributed to the action of water, which starts to behave as a selective solvent for PEG blocks; the PEG chains are more swollen with water than are the PNIPA chains.",

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T1 - Asymmetric swelling and self-assembly of poly(N-isopropyl-acrylamide)-block-poly(ethylene glycol) in water

AU - Motokawa, R.

AU - Morishita, K.

AU - Koizumi, S.

AU - Yoshimoto, E.

AU - Annaka, M.

PY - 2006/11/27

Y1 - 2006/11/27

N2 - This investigation focused on the self-assembly of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (PNIPA-b-PEG) in water. We distinguish four regions in the phase diagram: a transparent sol, opaque sol, opaque gel, and syneresis. Small-angle neutron scattering measurements revealed that microphase separation occurs above 17 {ring operator} C to form disordered micelles, which includes a range of states from (i) asymmetric swelling to (ii) micelle formation with only short-range liquid-like order. This result may be attributed to the action of water, which starts to behave as a selective solvent for PEG blocks; the PEG chains are more swollen with water than are the PNIPA chains.

AB - This investigation focused on the self-assembly of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (PNIPA-b-PEG) in water. We distinguish four regions in the phase diagram: a transparent sol, opaque sol, opaque gel, and syneresis. Small-angle neutron scattering measurements revealed that microphase separation occurs above 17 {ring operator} C to form disordered micelles, which includes a range of states from (i) asymmetric swelling to (ii) micelle formation with only short-range liquid-like order. This result may be attributed to the action of water, which starts to behave as a selective solvent for PEG blocks; the PEG chains are more swollen with water than are the PNIPA chains.

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