International Journal of New Chemistry
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Synthesis and characterization of poly methyl methacrylate-b-polystyrene copolymer/ multi -walled carbon nanotubes via ATRP and NMRP techniques

Document Type : Research Paper

Authors

Mojtaba Abbasian 1
Saber Ghasemi Karaj-Abad 2
Mehdi Hosseinzadeh 3
Shiva Asadi 4
Solmaz Esmaeily Shoja 5

1 Department of Chemical Engineering, University of Bonab, Bonab, Iran

2 Department of Chemistry, Payame Noor University, P. O. Box: 19395-3697 Tehran-Iran

3 Marand Faculty of Technical and Engineering, University of Tabriz, Tabriz, Iran

4 Department of Chemistry, Payame Noor University, P. O. Box: 19395-3697 Tehran- Iran

5 Lab. of Materials, Faculty of Engineering, Islamic Azad University, Bonab branch, Bonab, Iran.

https://doi.org/10.22034/ijnc.2022.551988.1266
Abstract
Graft polymerization of polymethyl methacrylate–block-polystyrene (PMMA-b-PSt) has been carried out from the surface of multi-walled carbon nanotubes (MWCNTs) using living radical polymerization methods. For this purpose, the first surfaces of MWCNTs were functionalized by acid treatment and then acylated by thionyl chloride (SOCl2). After that, the toluene unit was successfully grafted onto MWCNTs side walls by Friedel craft acylation reaction in the presence of ZnO as a catalyst. The obtained nanotube-toluene was brominated by N-bromosuccinimide (NBS). This brominated nanotube-toluene was used as a macroinitiator for atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in the presence of the CuBr/ 2, 2 -bipyridine (bpy) catalyst system to obtain MWCNTs-graft-polymethyl methacrylate (MWCNTs-g-PMMA). Then 1-hydroxy-2, 2, 6, 6-tetramethyl-piperidine (TEMPO-OH) obtained by reduction of 2, 2, 6, 6-tetramethyl-piperidinyl-1-oxy (TEMPO) with sodium ascorbate. The bromine groups at the end of PMMA have converted to nitroxide mediated groups by coupling with TEMPO-OH to yield MWCNTs terminated with a TEMPO unit (MWCNTs-PMMA-TEMPO). At last, the resulting macroinitiator was employed for ‘living’ free-radical polymerization of styrene (St) by nitroxide-mediated radical polymerization (NMRP) to form MWCNTs-g-(PMMA-b-PS). Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) show the effective grafting of MMA and styrene onto the MWCNTs.

Keywords

Multi-walled carbon nanotube functionalization
ATRP
Polystyrene
NMRP
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International Journal of New Chemistry
Volume 10, Issue 2
Spring 2023
Pages 65-83

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