Paper
1 September 2004 The water structure in the polymer network with LC-organisation
A. Joachimiak, Piotr Wojciechowski, T. Halamus
Author Affiliations +
Proceedings Volume 5565, XV Conference on Liquid Crystals; (2004) https://doi.org/10.1117/12.581220
Event: XV Conference on Liquid Crystals, 2003, Zakopane, Poland
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.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Joachimiak, Piotr Wojciechowski, and T. Halamus "The water structure in the polymer network with LC-organisation", Proc. SPIE 5565, XV Conference on Liquid Crystals, (1 September 2004); https://doi.org/10.1117/12.581220
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KEYWORDS
Polymers

Calcium

Ions

Raman spectroscopy

Liquids

Molecules

Deconvolution

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