Electrooptical and Molecular Properties of Fullerene-Containing Poly(Methyl Methacrylates) Prepared by Introducing Fullerenes C60 and C70 into the Polymer Structure by Different Methods (original) (raw)
Related papers
Russian Journal of General Chemistry, 2008
Kinetics was studied of bulk polymerization of methyl methacrylate initiated by dicyclohexyl peroxydicarbonate in the presence of tri-n-butylborane and fullerene C 60 (or C 70) at variable ratio initiator : fullerene. The deceleration of the polymerization in the first stage of the reaction (below 10% conversion) was established by dilatometric method that depended on the fullerene concentration and the mode of its addition to the monomer. It was shown that at similar ratios initiator : fullerene the C 60 inhibited the polymerization process considerably stronger than C 70. The gel-permeation chromatography revealed the widening of the molecular weight distribution of the poly(methyl methacrylates) containing C 60 or C 70 compared to its analog synthesized under the same conditions without fullerene. It was established that in the fullerene-containing poly(methyl methacrylates) all the framework nanospecies are linked by covalent bonds and are mostly accumulated in the low-molecular fractions. The effect of the covalently bound fullerene on the molecular characteristics of polymers were investigated by translational isothermal diffusion, high-speed sedimentation, and viscometry † Deceased.
Chapter 4. Fullerene-Containing Polymers
Nanoscience & Nanotechnology Series, 2011
Fullerene is one of the most fascinating classes of carbon clusters 1 and since the preparation in multigram amounts in 1990 of the most abundant member [60]fullerene, 2 it has attracted great interest due to its unique three-dimensional geometry and its outstanding magnetic, 3 superconducting, 4 electrochemical, 5 and photophysical 6 properties. However, because of the low solubility of C 60 and subsequently its scarce processability, these unique properties still are not widely employed in real applications. In this regard, the combination of fullerene chemistry and macromolecular chemistry provides an opportunity to create new fullerene-containing polymers, which show promise for an enormously broad scope of real applications since it merges C 60 properties with the ease and versatile processability and handling of polymers. This approach has led chemists to design and develop synthetic strategies aimed to obtain even more complex and fascinating novel fullerene-based architectures with unprecedented properties that have been recently reviewed. 7 Although polymer chemistry was a well-defined and-developed field, fullerene chemistry and properties, especially at the very beginning in the early 1990s, they were not completely disclosed and the combination of both aspects led to uncharacterisable or inutile AQ1 materials often obtained employing empirical synthetic methods. Fortunately, this experience paved the way for improving and
Journal of Electroanalytical Chemistry, 2016
The series of copolymers based on terthiophene 3′-substituted with C 60-pyrrolidine or styryl group, were electrochemically synthesized and characterized. The dense distribution of C 60 side group caused the steric effects between them and the perturbation in the extent of π-electron delocalization of the poly(terthiophene) backbone. The ESR spectroscopy showed the presence of close-packed clusters especially in homopolymer: poly(terthiophene-C 60). The oxidative electrochemical copolymerization of terthiophene units was performed to avoid this steric interactions and in results to extend the effective π-conjugation length in the polymer. The use of different ratio of the co-monomers contributed to the variable distribution of C 60 unit and different effective π-conjugation of the resulting polymers. Those changes affected electrochemical and photocurrentgenerating properties of these materials.
Synthesis and Polar and Electrooptical Properties of a Butylamine Derivative of Fullerene C60
Russian Journal of General Chemistry, 2005
A butylamine derivative of fullerene was prepared by the reaction of butylamine with fullerene C 60 .The experimental electrooptical and dipole characteristics of the derivative were compared with the corresponding calculated PM3 data. The reaction product proved to be inhomogeneous in the number of the amine molecules added; it contains polar multiadducts of C 60 with noncentrosymmetric distribution of covalently bound amino groups over the fullerene core.
13C NMR and Raman Studies of Fullerene-Based Poly (Acrylamides)
International Journal of Organic Chemistry, 2012
A new classification of the different types of fullerene-containing polymers is presented according to their different properties and applications they exhibit in a variety of fields. 13 C NMR and Raman studies of a series of polymeric samples of fullerene-grafted poly (acrylamide), which were prepared by systematic variation of concentration of fullerene and acrylamide, are described. 13 C NMR spectral analysis of the polymeric samples showed a peak for fullerene at 143 δppm and for poly (acrylamide) between 170 and 180 δppm and Raman spectral analysis of the polymeric samples gave the Raman band for fullerene between 1470 cm −1 and poly (acrylamide) at 2800 cm −1. The Tg value, obtained from DSC results, showed a high glass transition temperature at 100.94˚C revealing the presence of fullerene in the polymeric matrix. TGA analysis shows that polymer is thermally stable up to 340˚C.
Electrochemical properties of soluble fullerene derivatives
Electrochimica Acta, 2000
The family of fullerene derivatives obtained by 1,3-dipolar cycloaddition of azomethine ylides to C 60 is colloquially termed fulleropyrrolidines. In this paper, we report the synthesis and the electrochemical properties of a series of fulleropyrrolidine derivatives. All compounds are characterized by the presence of a solubilizing mTEG group. In addition, a derivative containing a thiophene moiety, covalently attached to the pyrrolidine ring has been studied. Cyclic voltammetry measurements, performed also at low temperatures, allowed the observation of five fullerene-centered reductions for all the species. Adsorption phenomena, however, were found associated to the last reduction processes in the thiophene-fulleropyrrolidine conjugate. Moreover, thanks to the increased solubility of the latter species in polar solvents (acetonitrile-dichloromethane mixtures) its anodic polymerization was carried out, leading to a conducting film still retaining the redox properties of the fullerene derivative.