Issue 10, 2011
From the journal:

Physical Chemistry Chemical Physics

Temperature responsive surface layers of modified celluloses

Rasmus Bodvik,ab   Esben Thormann,ab   Leif Karlsonc  and  Per M. Claesson*ab  

* Corresponding authors

a Department of Chemistry, Surface and Corrosion Science, Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
E-mail: percl@kth.se
Tel: +46 8 790 99 04

b Institute for Surface Chemistry, Box 5607, SE-114 86 Stockholm, Sweden

c Akzo Nobel Functional Chemicals AB, SE-444 85 Stenungsund, Sweden

Abstract

The temperature-dependent properties of pre-adsorbed layers of methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) were investigated on silica and hydrophobized silica surfaces. Three different techniques, quartz crystal microbalance with dissipation monitoring, ellipsometry, and atomic force microscopy imaging, were used, providing complementary and concise information on the structure, mass and viscoelastic properties of the polymer layer. Adsorption was conducted at 25 °C, followed by a rinsing step. The properties of such pre-adsorbed layers were determined as a function of temperature in the range 25 °C to 50 °C. It was found that the layers became more compact with increasing temperature and that this effect was reversible, when decreasing the temperature. The compaction was more prominent for MC, as shown in the AFM images and in the thickness data derived from the QCM analysis. This is consistent with the fact that the phase transition temperature is lower, in the vicinity of 50 °C, for MC than for HPMC. The water content of the adsorbed layers was found to be high, even at the highest temperature, 50 °C, explored in this investigation.

Graphical abstract: Temperature responsive surface layers of modified celluloses

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Article information

DOI
https://doi.org/10.1039/C0CP02074E
Article type
Paper
Submitted
07 Oct 2010
Accepted
15 Dec 2010
First published
18 Jan 2011

Phys. Chem. Chem. Phys., 2011,13, 4260-4268

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Temperature responsive surface layers of modified celluloses

R. Bodvik, E. Thormann, L. Karlson and P. M. Claesson, Phys. Chem. Chem. Phys., 2011, 13, 4260 DOI: 10.1039/C0CP02074E

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