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Synthesis of a main-chain liquid crystalline azo-polymer via “click” chemistry

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Abstract

A main-chain liquid crystalline azo-polymer (BPHCHA) was prepared through the copper-catalyzed “click” reaction between the alkyne group on 4,4′-bis((6-(propargyloxy)hexyl)oxy) biphenyl (BPH) and the azide group on 4-(6-azidohexyloxy)carbonyl-4′-(6′-azidohexyloxy) azobenzene (AHCHA). The “click” reaction was confirmed by FT-IR, 1H NMR, and GPC studies. The phase transition behavior of BPH, AHCHA, and the resulting azo-polymer BPHCHA was investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). AHCHA and BPHCHA exhibited mesomorphic behavior, while BPH is a crystalline compound. A liquid crystalline phase from 39 to 69 °C for AHCHA upon heating was observed under POM. Schlieren texture was observed at 130 °C for BPHCHA on cooling from 150 °C and annealed at 130 °C for 15 min. Moreover, DSC and POM studies showed that BPHCHA exhibited monotropic mesomorphic behavior.

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Acknowledgment

We thank the Natural Science Foundation of Tianjin (10JCYBJC02100) for financial support.

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Authors and Affiliations

  1. The Key Laboratory of Functional Polymer Materials of the Ministry of Education, Department of Chemistry, Nankai University, Tianjin, 300071, China

    Xiaolin Kang, Jiarui Zhao, Haiyang Li & Shangjin He

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  1. Xiaolin Kang
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  2. Jiarui Zhao
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  3. Haiyang Li
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  4. Shangjin He
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Correspondence to Shangjin He.

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Kang, X., Zhao, J., Li, H. et al. Synthesis of a main-chain liquid crystalline azo-polymer via “click” chemistry. Colloid Polym Sci 291, 2245–2251 (2013). https://doi.org/10.1007/s00396-013-2946-5

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  • DOI: https://doi.org/10.1007/s00396-013-2946-5

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