Effect of flexible units on the properties of silicon-containing phenyleneethynylene hybrid oligomers

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• 作者：Xian-kai Lin ; Rui Wang ; Fan Zeng ; Shu-hong Li 李书嬿/a>…
• 关键词：Sonogashira cross ; coupling ; Organosilicon unit ; Hybrid oligomers ; Thermal properties
• 刊名：Chinese Journal of Polymer Science
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：34
• 期：1
• 页码：52-58
• 全文大小：557 KB
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• 作者单位：Xian-kai Lin (1) (2)
  Rui Wang (2)
  Fan Zeng (2)
  Shu-hong Li 李书宏 (1)
  Cai-hong Xu 徐彩虹 (2)
  
  1. School of Science, Beijing Technology and Business University, Beijing, 100048, China
  2. Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

New silicon-containing phenyleneethynylene hybrid oligomers P2, P3, and P4 were synthesized via Sonogashira cross-coupling reactions of ethynyl-terminated silazane monomer N,N′-bis(4-ethynylphenyl)-1,1-diphenylsilazane (M1) and corresponding bis-(4-bromo-phenyl)-ended organosilicon unit containing monomers, respectively. These new oligomers were easily soluble in common solvents. The incorporation of flexible organosilicon units in the oligomers leads to blue-shift in both the UV-Vis absorption and fluorescence emission spectra similarly. The results of differential scanning calorimetry (DSC) indicate that the flexible units relieve the rigidity of oligomeric chain and provide favorable conformation for thermal cross-linking reactions. The oligomers show good thermal and thermal-oxidative stability from the thermogravimetric analysis (TGA), with their decomposition temperature at 10% weight loss (T _10%) higher than 400 °C under both nitrogen and air atmosphere.