Synthesis of polymerizable liquid crystalline monomers and their side chain liquid crystalline polymers bearing azo-ester linked benzothiazole mesogen

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• 作者：Md. Rabiul Karim ; Md. Rezaul Karim Sheikh ; Rosiyah Yahya…
• 关键词：Side chain liquid crystalline polymer ; Benzothiazole ; Thermal property ; Fluorescence emission
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：293
• 期：7
• 页码：1923-1935
• 全文大小：7,253 KB
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• 作者单位：Md. Rabiul Karim (1)
  Md. Rezaul Karim Sheikh (2)
  Rosiyah Yahya (3)
  Noordini M. Salleh (3)
  Ahmad Danial Azzahari (3)
  
  1. Department of Chemistry, University of Rajshahi, Rajshahi, 6205, Bangladesh
  2. Department of Applied Chemistry and Chemical Engineering, University of Rajshahi, Rajshahi, 6205, Bangladesh
  3. Department of Chemistry, University of Malaya, Kuala Lumpur, 50603, Malaysia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

A series of azo-ester linked benzothiazole mesogen containing new polymerizable liquid crystalline (LC) methacrylate monomers M1-strong class="EmphasisTypeBold">M4 having different terminal substituents (H, CH3, OCH3, and OC2H5) on the benzothiazole moiety and their side chain liquid crystalline polymers (SCLCPs) P1-strong class="EmphasisTypeBold">P4 were synthesized and characterized. The chemical structures, thermal stability, and LC phase behaviors of monomers and polymers were examined by the usage of different experimental techniques. All the synthesized monomers and polymers exhibited excellent thermal stability. Monomer M1 (without terminal substitution) displayed both nematic and smectic phases while monomers M2-strong class="EmphasisTypeBold">M4 (CH3, OCH3, and OC2H5 substituted) showed only nematic phase. On the other hand, all the prepared polymers exhibited only nematic LC phase. Polymers P1-strong class="EmphasisTypeBold">P4 showed two strong absorption bands in the range of 261-62 and 376-13?nm whereas polymers P1-strong class="EmphasisTypeBold">P4 exhibited strong fluorescence emission in the range of 522-24?nm. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels of the polymers were found to be ?.87 to ?.80?eV and ?.36 to ?.14?eV, respectively. The synthesized polymers could be potential candidate as fluorescent materials in the polymer light-emitting diode applications.