Structure and properties of fullerene containing polystyrene composites
|One of the most important branches of chemistry is creating of polymeric composites with regulated structure and properties. |
The aim of this work was to determine the fullerene concentration influence on structure, properties and biological activity of composites.
Polystyrene (PS) was modified by carbon nanoparticles by mixing of PS and C6o solutions in o-xylene. The fullerene content in composite was varied in w=0^1T0-3. Polymeric films were obtained by solvent transpiration from glassy substrate with further aging till complete solvent evaporation, the films thickness being 60^80 mkm.
PS composites structural characteristics were studied by X-ray diffraction. Composites containing w=1T0-4 of fullerene were established to have the highest segment mobility.
The existence of intermolecular complex between C60 and phenyl ring of polystyrene due to Van der Waals forces was supposed by the analysis of IR- and UV/Vis spectra of both initial and modified films.
DSC method revealed non-monotonic dependence of glass transition on composition of films with minimum at w=1-10-4. The effect of plasticization of polystyrene dominated at small fullerene additives and the effect of intermolecular interactions dominated at fullerene concentration w=110-4 and above was observed. Glass transition and specific heat of the received films were defined in the temperature range 20^150 0С.
Frequency dependences of films electro physical parameters, namely capacitance, inductive capacity, dielectric dissipation and resistivity were investigated dielkometrically. Composites observed appeared to be non-polar ones, non-monotonic inductivity dependence of a film with a minimum at 0.035 masses % С60 on its composition being revealed. Fullerenes doping styrene proved to conserve good dielectric properties of the polymer.
The research of biological potency of composites showed that the modified films had inhibitory action on strains of bacteria St. Aureus and E. Coli.
Afonina M. S.
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