Characterization of graphite-polyurethane composites used as electrode materials

Abstract

Graphite powder was mixed with polyurethane in order to prepare composite materials in different proportions, such as 50, 60 and 70% (graphite w/w) intended to be used in voltammetric analysis. Results of thermogravimetry, differential scanning calorimetry and dynamical mechanical analysis were used in the characterization of the composites. Thermal and visco-elastic behaviors of pressed and non-pressed graphite-polyurethane composites used as electrode materials were investigated regarding the graphite content. TG curves revealed that thermal stability increases with the graphite content. DSC presented that the composites are completely cured after 24 h and DMA was used in the determination of glass transition of the composites, varying between approximately 56 -59°C and 70 -83°C for pressed at 4000 psi and nonpressed composites, respectively, showing that the pressing during the cure resulted in lower mobility of polymeric chains inside the composites.

Uncured Polydimethylsiloxane as Binder Agent for Carbon Paste Electrodes: Application to the Quantification of Propranolol

“…30, No. 9, 2019 CPEs, such as solid paraffin, 24,25 polyurethane, [26][27][28][29] epoxy resins, 30,31 Teflon ® , 32,33 etc.…”

Effect of mechanical properties on the self‐healing behavior of waterborne polyurethane coatings

“…The T g determined by DMA was different from that achieved by DSC due to different experimental method, but they show the same tendency, and the DMA was a more accurate tool for detecting glass transitions of polymer films. 48,49 From the above discussion, it can be seen that there is a close relationship between cross-linking degree and mechanical properties since cross-linking increased the cohesive energy density of the film, restricted the mobility of polymer chains and restricted polymer chains from being deformed and broken by external forces, thus the tensile strength increased. Besides, it can be seen that the storage modulus of the polyurethane samples increased with the cross-linking degree increased, which is consistent with the result of tensile strength.…”