ELASTIC-HYSTERESIS PROPERTIES OF RUBBER CONTAINING CARBON NANOTUBES FUNCTIONALYZED BY POLYMER
Authors: Mansurova Irina A. , Isupova Olga Yu. , Burkov Andrey A. , Gavrilov Konstantin E. 
Published: April 2018

The paper investigates the influence of functionalized carbon nanotubes (CNTs) on the range of elastic-strength and elastic-hysteresis properties of vulcanizates based on SKI-3. It is established that during the functionalization of CNT (0.5 g) from an aqueous solution of polyvinylpyrrolidone (0.5 g / 100 ml) macromolecules are adsorbed on the nanoparticle surface, that is reflected in the intensity of intermolecular interaction and conformation of macromolecules according to IR spectroscopy (FTIR spectrometer «Infralum FT-08», ATIR methods). According to the transmission electron microscopy (JEM 2100, «JEOL» company) the functionalization of CNTs does not change the structure of the multi-walled nanotubes, but accompanied by the formation of «protective» layer on their surface. Its thickness varies from a few nanometers to a state where the nanotube «immersed» into the polymer. According to rheometer studies on Rheo-line Moving Die vibrorheometer «Prescott» (150°С), RPA2000 (170°С), such kind of additive in the rubber compound based on SKI-3 (0.1 phr) has almost no effect on the kinetics of vulcanization and the degree of macromolecules crosslinking. Vulcanizates are characterized by high fatigue endurance under uniaxial tension conditions (e = 150%) without significant change in the elastic-strength properties (conventional stress at an elongation of 100 and 300%, conventional stress at break). In addition to the above the glass transition temperature, the macromolecular segmental mobility defrosts interval corresponding to standard sample according to thermal analysis (DSC analyzer «Shimadzu», temperature rise rate is 2 °C/min). At the shear deformation mode from 0.3 to 10% (RPA2000, 70 °C, 10 Hz), change in dynamic characteristics (modulus, loss modulus, mechanical loss angle tangent) is traditional and generally corresponds to the standard sample. However, the study of dynamic characteristics of the vulcanizates after pre-training (100 cycles, 70 °C, 10 Hz), that in the best way represents the behavior of rubber during the operation, showed that the introduction of a modifying additive significantly reduces hysteresis loss with increasing deformation. As a result of the additional study of the thermal conductive properties of vulcanizates (ITEM-1M f. Etalon), their mechanical properties under conditions of accelerated thermal-oxidative aging (100 °С, 24 h), the structure of vulcanizates in the region of microscopic ruptures by scanning electron microscopy (GSM 6510 LV f. JEOL, SEI mode) reasons for the growth of fatigue endurance were established. So, most likely, the growth of fatigue endurance of vulcanizates is due to the ability of macromolecules to orient themselves relative to the body of CNTs in the process of repeated cyclic deformation, as well as the plasticizing action of nanoparticles, functionalized by a polar polymer by the mechanism of an interstructural plasticizer.For citation:Mansurova I.A., Isupova O.Yu., Burkov A.A., Gavrilov K.E. Elastic-hysteresis properties of rubber containing carbon nanotubes functionalized by polymer. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 4-5. P. 76-83