Transport properties of water in hydroxypropyl methylcellulose

Charlotte Trotzig, Susanna Abrahmsen-Alami, Frans Maurer

Research output: Contribution to journalArticlepeer-review

Abstract

The relation between the self-diffusion coefficient, D-self, of water and the free volume hole size, V-h, has been investigated in a hydroxypropyl methylcellulose (HPMC)-water system in the water content range 0.08-0.36 w/w, at room temperature. Furthermore, the thermal properties of the water in the HPMC-water system, as measured with differential scanning calorimetry (DSC) and the tensile storage, E', and tensile loss, E '', moduli, of the HPMC-water systems, as determined with dynamic mechanical analysis (DMA), have been probed. Pulsed-field gradient nuclear magnetic resonance (PFG NMR) was used to measure the D-self of water and positron annihilation lifetime spectroscopy (PALS) was used to measure the ortho-Positronium (o-Ps) lifetime in the HPMC-water system. The glass transition temperature of the HPMC was found to be reduced by the water to room temperature in the water content range 0.10-0.15 w/w. The relation between ln D-self of water and the inverse free volume hole size of the HPMC-water system was non-linear. Furthermore, the PALS measurements showed that molecular water co-existed with water clusters in the HPMC-water system. (C) 2009 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2812-2820
JournalEuropean Polymer Journal
Volume45
Issue number10
DOIs
Publication statusPublished - 2009

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)

Subject classification (UKÄ)

  • Chemical Sciences

Free keywords

  • Water clusters
  • Self-diffusion coefficient
  • Free volume
  • Positron
  • annihilation
  • NMR

Fingerprint

Dive into the research topics of 'Transport properties of water in hydroxypropyl methylcellulose'. Together they form a unique fingerprint.

Cite this