期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 20, 期 -, 页码 4241-4255出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2022.08.120
关键词
Nanocomposites; Graphene oxide; Polymethylmethacrylate; Ultraviolet radiation; Electrical conductivity
资金
- Coordination for the Improvement of Higher Level Personnel (CAPES)
- National Councilof Research (CNPq)
- Foundation for Supporting Reasearch in the State of Rio de Janeiro (FAPERJ)
Polymeric nanocomposites of PMMA added with 20wt.% GO were synthesized and irradiated with UV-B to reduce GO and obtain electrically semiconductive nanocomposites (PMMA-rGO). The addition of GO and its reduction by UV-B radiation promoted thermal stability, stiffness, and electrical conductivity of the nanocomposites. The UV-B irradiation also improved the dispersion of rGO in the PMMA matrix and enhanced the surface interaction between GO/rGO flakes and the PMMA matrix.
Polymeric nanocomposites of polymethylmethacrylate (PMMA) added with up to 20wt.% of graphene oxide (GO) were synthesized by the solvent evaporation technique and, for the first time, irradiated with ultraviolet radiation (UV-B) to reduce GO and obtain novel films of electrically semiconductive nanocomposites (PMMA-rGO). The exposition times to reduce the GO in these nanocomposites were 48 and 96 h. Chemical, physical, and electrical conductivity analyses were performed, and both GO and rGO added PMMA nanocomposites results were compared before and after UV-B radiation. Plain PMMA results were also compared as control. These results showed that the addition of GO flakes and its reduction (rGO) by UV-B radiation promoted better thermal stability and stiffness to the nanocomposites than to plain PMMA, as demonstrated by the thermogravimetric and differential scanning calorimetry analyses. High resolution scanning electron microscopy demonstrated well distributed rGO particles in the PMMA matrix. FTIR and Raman confirm the reduction process of GO after being UV-B rays irradiated. The colorimetric analyses showed that the GO and rGO flakes and the PMMA matrix presented an excellent superficial interaction. The results of electrical conductivity for the PMMA matrix (4.50 x 10-9 S/ m) and the nanocomposites with 2 wt. % GO (1.21 x 10-9 S/m) revealed an insulating behavior, whcich decreases for an addition of 20 wt.% GO. The electrical conductivity displayed a significant improvement with UV-B radiation, such that with 20 wt.% rGO
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