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Water-Soluble Polymeric Methanofullerene and Fulleropyrrolidine Derivatives

“…Its Kerr coefficient K differs significantly by the sign and absolute value from the initial PVP, exceeding that of the fullerene adduct, even though the weight fraction of the latter in the polymer is small. Generally, the above-mentioned alterations of the molecular properties of PVP-2 are consistent with the previous results obtained for the pairs constituted by a star-like PVP3C 60 and linear PVP having similar molecular weight [4,5].…”

“…Their Kerr coefficient in chloroform was found to be +5.3 0 10 !10 cm 5 g !1 (300 V) !2 . Covalent or coordination incorporation into PVP macromolecules of polar carbon nanoparticles having different polarization, dielectric, and optical characteristics, compared to the polymer, alters significantly the properties of the polymer, as we have been previously demonstrated for the example of star-like PVP-based dendrimers with C 60 as a branching site [4,5]. Figure 3 shows the results of a comparative study of the electrooptical Kerr effect in chloroform for samples of starting compounds 2 and PVP3NH 2 and also for the synthetic derivative PVP-2.…”

Electrooptical and Molecular Properties of Fullerene-Containing Poly(Methyl Methacrylates) Prepared by Introducing Fullerenes C60 and C70 into the Polymer Structure by Different Methods

“…This makes it possible, first, to exploit the properties of fullerenes spread in thin polymer films and, second, to usefully modify the polymer support itself, e.g., to increase its electrical conductivity [5] or to impart to it nonlinear optical properties [6]. Our previous studies of C 60 derivatives [7,8] and published data on hybrid polymeric compounds with various types of chemical bonding of fullerenes [13 6, 9] suggest that the outcome of modification of the polymer depends on the method of introducing fullerene into its composition. Even relatively small weight fractions of fullerenes in some cases significantly affect the initial polymer.…”

“…Even relatively small weight fractions of fullerenes in some cases significantly affect the initial polymer. For example, covalent bonding of the fullerene C 60 as a site of branching of the macromolecules of polyvinylpyrrolidone (PVP) [7] and polystyrene (PS) [6] of a star-like structure significantly modifies the optical, dielectric, and electrooptical properties of PVP and PS, when the C 60 fraction is ca. 1 wt %.…”

“…To this end, we carried out viscometric studies of the polymer solutions in benzene, determined their molecular weights M, and studied their electrooptical properties by the method of the Kerr effect in a pulsed electric field [12]. We chose the Kerr effect for this study, since it is highly sensitive to any changes due to structural transformations in the polymer chain, as well as ÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄ since it already demonstrated its suitability for detecting the changes in the properties of fullerene-containing compounds relative to the initial analogs [7,8].…”