Nanocomposites containing polyvinyl alcohol and reinforced carbon-based nanofiller

Khdejah S Hajeeassa, Mahmoud A Hussein, Yasir Anwar, Nada Y Tashkandi, Zahra M Al-amshany
2018 Nanobiomedicine  
A new class of biologically active polymer nanocomposites based on polyvinyl alcohol and reinforced mixed graphene/carbon nanotube as carbon-based nanofillers with a general abbreviation (polyvinyl alcohol/mixed graphenecarbon nanotubes) has been successfully synthesized by an efficient solution mixing method with the help of ultrasonic radiation. Mixed graphene and carbon nanotubes ratio has been prepared (50%:50%) wt by wt. Different loading of mixed graphene-carbon nanotubes (2, 5, 10, 15,
more » ... d 20 wt%) were added to the host polyvinyl alcohol polymer. In this study, polyvinyl alcohol/mixed graphene-carbon nanotubes a-e nanocomposites were characterized and analyzed by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, and the thermal stability was measured by thermogravimetric analysis and derivative thermal gravimetric. Fourier transform infrared and X-ray diffraction spectra proved the addition of mixed graphene-carbon nanotubes into polyvinyl alcohol matrix. X-ray diffraction patterns for these nanocomposites showed 2θ ¼ 19.35 and 40 due to the crystal nature of polyvinyl alcohol in addition to 2θ ¼ 26.5 which attributed to the graphite plane of carbon-based nanofillers. Thermal stability of polyvinyl alcohol/mixed graphene-carbon nanotubes nanocomposites was enhanced comparing with pure polyvinyl alcohol. The main degradation step ranged between 360 and 450 C. Moreover, maximum composite degradation temperature has appeared at range from 285 C to 267 C and final composite degradation temperature (FCDT) displayed at a temperature range of 469-491 C. Antibacterial property of polyvinyl alcohol/mixed graphene-carbon nanotubes a-e nanocomposites were tested against Escherichia coli bacteria using the colony forming units technique. Results showed an improvement of antibacterial property. The rate percentages of polyvinyl alcohol/mixed graphene-carbon nanotubes b , polyvinyl alcohol/mixed graphenecarbon nanotubes c , and polyvinyl alcohol/mixed graphene-carbon nanotubes d nanocomposites after 24 h are 6%, 5%, and 7% respectively. However, polyvinyl alcohol/mixed graphene-carbon nanotubes e nanocomposite showed hyperactivity, where its reduction percentage remarkably raised up to 100% which is the highest inhibition rate percentage. In addition, polyvinyl alcohol and polyvinyl alcohol/graphene-carbon nanotubes a-d showed colony forming units values/ml 70 Â 10 6 and 65 + 2 Â 10 6 after 12 h. After 24 h, the colony forming units values/ml were in the range of 86 Â 10 6 -95 Â 10 6 .
doi:10.1177/1849543518794818 pmid:30159049 fatcat:snrgwi2cfnh4bnlubcci2leg4i