Synthesis of polyethylene‐grafted multiwalled carbon nanotubes via a peroxide‐initiating radical coupling reaction and by using well‐defined TEMPO and thiol end‐functionalized polyethylenes |
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Authors: | Sohaib Akbar Emmanuel Beyou Philippe Chaumont Jérôme Mazzolini Edgar Espinosa Franck D'agosto Christophe Boisson |
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Institution: | 1. Université de Lyon, Lyon, F‐69003, France, Université Lyon 1, Lyon, F‐69003, France, CNRS UMR5223, Ingénierie des Matériaux Polymères: Laboratoire des Matériaux Polymères et Biomatériaux, 15 boulevard Latarget, F‐69622 Villeurbanne, France;2. Université de Lyon, Université Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2), LCPP group, 43, Bd. du 11 Novembre 1918, F‐69616 Villeurbanne, France |
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Abstract: | Polyethylene (PE), alkoxyamine‐ and thiol‐terminated PEs (PE‐TEMPO and PE‐SH, respectively) can be converted to macroradicals using a peroxide, a thermal cleavage of the alkoxyamine and a hydrogen transfer reaction of the thiol, respectively. The addition of these macroradicals to multiwalled carbon nanotubes (MWCNTs) were compared by performing grafting reactions at 160 °C in 1,3‐dichlorobenzene as solvent. Raman spectroscopy was utilized to follow the introduction of PE on the MWCNTs' surface while thermogravimetric and elemental analysis indicated the extent of this grafting. The grafting ratio was found to be in the range of 19–36 wt %. PE‐functionalized MWCNTs were imaged by transmission electronic microscopy showing a PE layer with various thicknesses covering the surface of nanotubes. It was found that higher levels of grafting were obtained using PE‐2,2,6,6‐tetramethylpiperidinyl‐1‐oxy and PE‐SH rather than a radical grafting reaction in which dicumyl peroxide, PE, and MWCNTs were reacted. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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Keywords: | DCP end‐functionalized polyethylene hydrogen abstraction modification MWCNTs nanocomposites polyethylene (PE) radical grafting radical scavenger TEMPO |
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