Effect of polarity of substituents on phase transition of LC cellulose polymers

Piotr Wojciechowski

doi:10.1117/12.301293

1 January 1998 Effect of polarity of substituents on phase transition of LC cellulose polymers

Piotr Wojciechowski

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301293
Event: Liquid Crystals, 1997, Zakopane, Poland

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.

Citation Download Citation

Piotr Wojciechowski "Effect of polarity of substituents on phase transition of LC cellulose polymers", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301293

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