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Proceedings Paper

Effect of polarity of substituents on phase transition of LC cellulose polymers
Author(s): Piotr Wojciechowski
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Paper Abstract

The differential scanning calorimetry (DSC) and the thermo- optical analysis were used to study the phase transitions of 2-(hydroxypropyl)cellulose (HPC) and three thermotropic liquid crystalline derivatives of the HPC: the propionyloxy ester, the hexanoyloxy ester and the cyanoethylated derivative. All the investigated derivatives show in the heating scan of the DSC an endothermic transition in the range of temperature of melting of the birefringent phase. Additionally the cyanoethylated derivative of HPC reveals the exothermic phase transition below the melting temperature of the birefringent phase. This phase transition is connected with a large increase of transmission of polarized light. The results are discussed in terms of polarity HPC and their derivatives. The decrease of the polarity of the nonmesogenic side chains of HPC shifts the clearing temperature towards lower values and extends the temperature range of the mesophase.

Paper Details

Date Published: 1 January 1998
PDF: 5 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301293
Show Author Affiliations
Piotr Wojciechowski, Technical Univ. of Lodz (Poland)

Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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