Polystyrene-attached graphene nanolayers by reversible addition-fragmentation chain transfer polymerization: a grafting from epoxy groups with various densities

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• 作者：Hossein Roghani-Mamaqani ; Khezrollah Khezri
• 关键词：Polystyrene ; Graphene ; Reversible addition ; fragmentation chain transfer polymerization ; Graft density
• 刊名：Journal of Polymer Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：23
• 期：9
• 全文大小：3,495 KB
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• 作者单位：Hossein Roghani-Mamaqani (1)
  Khezrollah Khezri (2)
  
  1. Department of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran
  2. Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935
• 卷排序：23

文摘

Graphene oxide was chemically functionalized with a modifier synthesized from coupling reaction of ethylenediamine and 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid in low and high graft densities. Then, the modified graphenes were used in grafting from reversible addition-fragmentation chain transfer polymerization of styrene. Successful synthesis and grafting of modifier was approved by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy (FTIR). Also, FTIR, X-ray photo electron spectroscopy, and Raman spectroscopy were used to confirm the successful grafting of modifier moieties. Molecular weight and polydispersity index of attached polystyrene chains were studied by size exclusion chromatography. Thermogravimetric analysis was used to investigate the degradation temperatures, char contents, and graft ratios. Weight ratio of modifier in modified graphenes is calculated to be 4.93 × 10−2 and 12.23 × 10−2 for low and high graft densities. Also, molar ratio of modifier is 121.22 and 300.71 μmol/g respectively. Scanning electron and transmission electron microscopies show that graphite layers with flat surface were wrinkled during the oxidation process and also polystyrene-grafted graphenes are observed as opaque layers. Keywords Polystyrene Graphene Reversible addition-fragmentation chain transfer polymerization Graft density