Changes in morphology and optical properties of polyvinyl alcohol foils induced by Congo red dye concentration and stretching degree

Carmen Beatrice Zelinschi; Iuliana Stoica; Dana Ortansa Dorohoi

doi:10.1515/polyeng-2013-0189

Article

Changes in morphology and optical properties of polyvinyl alcohol foils induced by Congo red dye concentration and stretching degree

Carmen Beatrice Zelinschi , Iuliana Stoica and Dana Ortansa Dorohoi

Published/Copyright: February 21, 2014

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From the journal Journal of Polymer Engineering Volume 34 Issue 4

Abstract

To establish correlations between the optical and morphological properties of anisotropic polyvinyl alcohol (PVA) foils containing Congo red (CR) dye in various concentrations, characteristics such as degree of crystallinity, dichroic ratio, order parameter, birefringence, surface morphology, and three-dimensional texture parameters were estimated before and after stretching. An increase in morphological and optical anisotropy with the degree of stretching has been evidenced for both pure and CR-containing PVA foils, this behavior being facilitated by the presence of the dye. The study of these properties lays the foundation for understanding the circumstances in which PVA foils containing CR can be used as polarizing filters.

Keywords: Congo red; morphological anisotropy; optical anisotropy; polyvinyl alcohol; texture parameters

Corresponding author: Iuliana Stoica, “Petru Poni” Institute of Macromolecular Chemistry, Department of Polymer Materials Physics, 41 Grigore Ghica Voda Alley, Iasi RO-700487, Romania, e-mail: stoica_iuliana@icmpp.ro

Acknowledgments

This work was partially supported by the European Social Fund in Romania, under the responsibility of the Managing Authority for the Sectoral Operational Programme for Human Resources Development 2007-2013, grant POSDRU/88/1.5/S/47646.

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Received: 2013-8-2

Accepted: 2014-1-16

Published Online: 2014-2-21

Published in Print: 2014-6-1

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Articles in the same Issue

https://doi.org/10.1515/polyeng-2013-0189

Keywords for this article

Congo red; morphological anisotropy; optical anisotropy; polyvinyl alcohol; texture parameters