Preparation and orientation behavior of multi‐walled carbon nanotubes grafted with a side‐chain azobenzene liquid crystalline polymer

Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, PR China
Polymer International (Impact Factor: 2.41). 01/2011; 60(1):93 - 101. DOI: 10.1002/pi.2917


Covalent functionalization of multi‐walled carbon nanotubes (MWNTs) with side‐chain azobenzene liquid crystalline poly{6‐[4‐(4‐methoxyphenylazo)phenoxy]hexyl methacrylate} (PMMAZO) was successfully achieved via atom transfer radical polymerization. The resultant samples were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis and transmission electron microscopy. The results of differential scanning calorimetry and polarized optical microscopy show that the liquid crystalline behavior of PMMAZO‐functionalized carbon nanotubes (CNT‐PMMAZO) is similar to that of the PMMAZO homopolymer. The orientation of MWNTs and CNT‐PMMAZO in a PMMAZO matrix in the presence of an electric field was investigated. The results indicate that the orientation of MWNTs is dominated by the viscosity of the matrix, but the orientation of CNT‐PMMAZO is controlled by both the viscosity and the presence of a liquid crystalline phase ascribed to the compatibility between MWNTs and PMMAZO becoming better after covalent modification. Copyright © 2010 Society of Chemical Industry

0 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: This chapter contains sections titled: IntroductionDispersion of Carbon NanotubesLiquid Crystal Phases of Carbon NanotubesCarbon Nanotubes Aligned by Thermotropic Liquid CrystalsCarbon Nanotubes Aligned by Lyotropic Liquid CrystalsCarbon Nanotubes in Liquid Crystalline Polymers or Polymerized Liquid CrystalsConclusions and OutlookReferences
    No preview · Chapter · May 2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: The ability to tune the microstructures, bandgap, conductance, chemical environment and thermal storage of carbon nanomaterials such as carbon nanotubes, graphene and fullerenes by optical modulation or response is important to design and fabricate advanced optoelectronic nanodevices. This review is focused on optical control and regulation of structures, properties, interface and interaction of a new generation of photo-responsive carbon nanomaterials/azobenzene moieties (Carbon-AZO) hybrids. The optical switching properties of Carbon-AZO hybrids resulting from the photo-isomerization between trans and cis isomers are highlighted and discussed in terms of photo-energy conversion devices including switches, sensors, detectors, fuels and storage. A wide range of advanced energy conversion devices using Carbon-AZO hybrids can be developed in the future by the optimization of the chemical structure, steric conformation, electrostatic environment and functionalization of specific molecules.
    No preview · Article · Aug 2012 · Nanoscale
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Carbon nanotubes (CNTs) represent one of the most promising materials in nanoscience today, with their unique electronic, chemical and mechanical properties. Strong van der Waals interactions and poor solubility greatly affect their potential for applications in various fields. In the past decade, great efforts have been undertaken to modify CNTs into organophilic material via covalent and non-covalent grafting strategies. This review focuses on advances in various strategies used for the surface initiated polymerization and provides perspectives on grafting polymers covalently from CNTs.
    Full-text · Article · Oct 2012 · Chemical Society Reviews
Show more