In this study, Baytube™ multi-walled carbon nanotubes (MWCNTs) were in situ modified by graft-polymerized 2,2 0 -bithiophene. The obtained PBT-g-MWCNTs were used as fillers for the development of semi-conductive nanocomposites with ethylene-octene copolymer (EOC, ENGAGE™ 8540). The methods of infrared and Raman spectroscopy, thermogravimetric analysis, and transmission electron microscopy were used to characterize the filler materials. Composite specimens with neat MWCNTs and PBT-g-MWCNTs at their contents of 3, 5, and 10 wt% were made by ultra-sound assisted master batching method and their mechanical and dielectric properties were compared. The strength properties (storage modulus, tensile strength) and the elongation at break of the composites with high contents (> 3 wt%) of PBT-g-MWCNTs were notably improved comparing to EOC/MWCNT composites. A notable improvement by more than two orders of magnitude of EOC conductivity was determined at 10 wt% content of PBT-g-MWCNT compared to that of pristine MWCNTs used as the composite nanofiller. POLYM. COMPOS., 40:3971-3980, 2019.
POLYMER COMPOSITES-2019FIG. 7. The storage modulus (a), loss modulus (b), and damping factor (c) of pristine EOC and EOC composites as a function of temperature.
In the present study, an approach for the graft polymerization of multi-walled carbon nanotubes (MWCNTs) with 3,4-ethylenedioxythiophene (EDOT) has been evaluated. The surface of the MWCNTs was activated with thiophene groups through the amide linker followed by oxidative polymerization of EDOT monomer resulted in the development of PEDOT-g-MWCNTs. The methods of thermal gravimetric analysis (TGA), X-ray fluorescence, and Raman spectroscopy were used for characterization of functionalization efficiency. The TGA data indicated of 21% functionalization attached to MWCNTs. X-ray fluorescence confirmed the presence of Cl, and S atoms in functionalized fillers. The study of Raman spectra confirmed the presence of PEDOT groups attributed to most characteristic signal at 1400-1500 cm-1 region. The electrical conductivity for both pristine MWCNT and PEDOT-g-MWCNT powder materials was compared.
Polypropylene and it`s matrix composites have been used for decades. To make new materials for traditional and specific applications it has been blended with ethylene 1-octene copolymer to improve processing and impact resistance. To make material with non-common specific application nanostructured zinc oxide particles have been used to obtain material with good antiseptic properties, ultraviolet radiation stability, improved tribological and mechanical parameters. In the research polypropylene composites with ethylene 1-octene copolymer (0, 10 and 30 wt.%) and zinc oxide (0, 0.1, 0.5, 1 and 2 wt.%) obtained by melt mixing have been investigated. Rheological properties have been obtained by using two-capillary rheometer. Obtained results show pseudoplastic nature of all the tested composites. Shear data show no significant effect of zinc oxide particle concentration on shear viscosity of the tested materials. On the other hand, extensional viscosity data demonstrate considerable melt flow sensibility of the investigated composition. Addition of ZnO and EOC, however, has some stabilizing effect on melt behavior of the investigated PP based compositions.
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