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Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone

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Abstract

Synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology is presented. Synthesised polyesters consist of bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene as a mesogen and aliphatic diacid chloride as flexible spacer. The length of oligomethylene units in the polymer was varied from the trimethylene to the dodecamethylene groups. Synthesized polyesters were characterized by differential scanning calorimetry and optical microscopy. The transition temperatures and thermodynamic properties were studied for all these polymers. These polyesters exhibited thermotropic liquid crystalline behavior and showed nematic texture except decamethylene spacer. Decamethylene spacer based polyester showed marble texture of smectic C. Mesophase stability of these polyesters was higher than \(123{^{\circ }}\hbox {C}\) (except first heating cycle of PE-1).

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SYNOPSIS The present study deals with the synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology.

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Authors and Affiliations

  1. Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra, 411 008, India

    Nagesh Manurkar, Sayaji More, Khudbudin Mulani, Nitin Ganjave & Nayaku Chavan

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  1. Nagesh Manurkar
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  2. Sayaji More
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  3. Khudbudin Mulani
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  4. Nitin Ganjave
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  5. Nayaku Chavan
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Correspondence to Nayaku Chavan.

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Manurkar, N., More, S., Mulani, K. et al. Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone. J Chem Sci 129, 1461–1468 (2017). https://doi.org/10.1007/s12039-017-1342-y

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