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Proceedings Paper

The water structure in the polymer network with LC-organisation
Author(s): A. Joachimiak; Piotr Wojciechowski; T. Halamus
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Paper Abstract

The water structure existing in (2-hydroxypropyl)cellulose-poly(acrylic acid)-water (HPC-PAA-H2O) hydrogel, exhibiting liquid crystalline (LC) organization of the polymer network (anisotropic hydrogel), was assessed by means of Raman spectroscopy. It was shown that the LC-network of HPC-PAA-H20 exerts significant influence on the structure of liquid water present in the hydration shells around polymer chains of the anisotropic hydrogel. Due to poor stability of LC-ordering of polymer network, observed in HPC-PAA-H2O) after its long-term water immersion, the process of crosslinking of the anisotropic hydrogel was considered. The results of Raman measurements revealed that, during immersion of HPC-PAA-H2O in calcium ions (Ca2+) solution, formation of a salt by poly(acrylic acid) of HPC-PAA-H2O and Ca2+ takes place. This results in crosslinking of the anisotropic hydrogel, leading -- in a consequence -- to significant improvement of its mechanical toughness, as well as to stability of LC-ordering of the investigated network in the swollen state. However, during crosslinking of the anisotropic hydrogel (by Ca2+), apart from formation of the salt by Ca2+ and PAA, the ions influence additionally the structure of the water existing in hydration shells round polymer chains of both polymer constituents (HPC and PAA) creating the anisotropic hydrogel network.

Paper Details

Date Published: 1 September 2004
PDF: 6 pages
Proc. SPIE 5565, XV Conference on Liquid Crystals, (1 September 2004); doi: 10.1117/12.581220
Show Author Affiliations
A. Joachimiak, Technical Univ. of Lodz (Poland)
Piotr Wojciechowski, Technical Univ. of Lodz (Poland)
T. Halamus, Technical Univ. of Lodz (Poland)

Published in SPIE Proceedings Vol. 5565:
XV Conference on Liquid Crystals
Jozef Zmija, Editor(s)

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