Free volume and swelling in thin films of poly(N-isopropylacrylamide) end-capped with N-butyltrithiocarbonate

S. Harms; K. Rätzke; F. Faupel; W. Egger; L. Ravello; A. Laschewsky; W. Wang; P. Müller-Buschbaum

doi:10.1002/marc.201000067

Free volume and swelling in thin films of poly(N-isopropylacrylamide) end-capped with N-butyltrithiocarbonate

S. Harms, K. Rätzke, F. Faupel, W. Egger, L. Ravello, A. Laschewsky, W. Wang, P. Müller-Buschbaum

Chair of Functional Materials

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

22 Scopus citations

Abstract

The free volume in thin films of poly(N-isopropylacrylamid) end-capped with n-butyltriocarbonate (nbc-PNIPAM) is probed with positron annihilation lifetime spectroscopy (PALS). The PALS measurements are performed as function of energy to obtain depth profiles of the free volume of nbc-PNIPAM films. The range of nbc-PNIPAM films with thicknesses from 40 to 200 nm is focused. With decreasing film thickness the free volume increases in good agreement with an increase in the maximum swelling capability of the nbc-PNIPAM films. Thus in thin hydrogel films the sorption and swelling behavior is governed by free volume. (Figure Presented)

Original language	English
Pages (from-to)	1364-1367
Number of pages	4
Journal	Macromolecular Rapid Communications
Volume	31
Issue number	15
DOIs	https://doi.org/10.1002/marc.201000067
State	Published - 3 Aug 2010

Keywords

Block copolymers
Films
Free volume
Positron annihilation
Stimuli-sensitive polymers
Swelling hydrogel films

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10.1002/marc.201000067

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title = "Free volume and swelling in thin films of poly(N-isopropylacrylamide) end-capped with N-butyltrithiocarbonate",

abstract = "The free volume in thin films of poly(N-isopropylacrylamid) end-capped with n-butyltriocarbonate (nbc-PNIPAM) is probed with positron annihilation lifetime spectroscopy (PALS). The PALS measurements are performed as function of energy to obtain depth profiles of the free volume of nbc-PNIPAM films. The range of nbc-PNIPAM films with thicknesses from 40 to 200 nm is focused. With decreasing film thickness the free volume increases in good agreement with an increase in the maximum swelling capability of the nbc-PNIPAM films. Thus in thin hydrogel films the sorption and swelling behavior is governed by free volume. (Figure Presented)",

keywords = "Block copolymers, Films, Free volume, Positron annihilation, Stimuli-sensitive polymers, Swelling hydrogel films",

author = "S. Harms and K. R{\"a}tzke and F. Faupel and W. Egger and L. Ravello and A. Laschewsky and W. Wang and P. M{\"u}ller-Buschbaum",

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language = "English",

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T1 - Free volume and swelling in thin films of poly(N-isopropylacrylamide) end-capped with N-butyltrithiocarbonate

AU - Harms, S.

AU - Rätzke, K.

AU - Faupel, F.

AU - Egger, W.

AU - Ravello, L.

AU - Laschewsky, A.

AU - Wang, W.

AU - Müller-Buschbaum, P.

PY - 2010/8/3

Y1 - 2010/8/3

N2 - The free volume in thin films of poly(N-isopropylacrylamid) end-capped with n-butyltriocarbonate (nbc-PNIPAM) is probed with positron annihilation lifetime spectroscopy (PALS). The PALS measurements are performed as function of energy to obtain depth profiles of the free volume of nbc-PNIPAM films. The range of nbc-PNIPAM films with thicknesses from 40 to 200 nm is focused. With decreasing film thickness the free volume increases in good agreement with an increase in the maximum swelling capability of the nbc-PNIPAM films. Thus in thin hydrogel films the sorption and swelling behavior is governed by free volume. (Figure Presented)

AB - The free volume in thin films of poly(N-isopropylacrylamid) end-capped with n-butyltriocarbonate (nbc-PNIPAM) is probed with positron annihilation lifetime spectroscopy (PALS). The PALS measurements are performed as function of energy to obtain depth profiles of the free volume of nbc-PNIPAM films. The range of nbc-PNIPAM films with thicknesses from 40 to 200 nm is focused. With decreasing film thickness the free volume increases in good agreement with an increase in the maximum swelling capability of the nbc-PNIPAM films. Thus in thin hydrogel films the sorption and swelling behavior is governed by free volume. (Figure Presented)

KW - Block copolymers

KW - Films

KW - Free volume

KW - Positron annihilation

KW - Stimuli-sensitive polymers

KW - Swelling hydrogel films

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U2 - 10.1002/marc.201000067

DO - 10.1002/marc.201000067

M3 - Article

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SN - 1022-1336

VL - 31

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JO - Macromolecular Rapid Communications

JF - Macromolecular Rapid Communications

IS - 15

ER -

Free volume and swelling in thin films of poly(N-isopropylacrylamide) end-capped with N-butyltrithiocarbonate

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Keywords

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