Figure 4 - uploaded by Marcos Fernandes De Oliveira
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– Flame treatment showing the interaction between the chemical groups from the polymer and the coating.
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The plastics usage in OEM applications continues to grow, due to their excellent features regarding flexibility, high-impact and strength. Today in automotive applications, plastics components are approximately 10% of the total vehicle weight, offering ductility, corrosion resistance and increased styling capability (RYNTZ, 2006). In order to impro...
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Citations
... In addition, this selection is corroborate by the good adhesion property between the LDPE surface and coating due to a high surface energy value~31.9 mJ/m 2 [26], and a strong CH-π hydrogen bond of ca. 1.5-2.5 kcal/mol [27]. ...
Morphological, structural, and thermoresistive properties of films deposited on low-density polyethylene (LDPE) substrates are investigated for possible application in flexible electronics. Scanning and transmission electron microscopy analyses, and X-ray diffraction measurements show that the films consist of overlapped graphite nanoplatelets (GNP) each composed on average of 41 graphene layers. Differential scanning calorimetry and dynamic-mechanical-thermal analysis indicate that irreversible phase transitions and large variations of mechanical parameters in the polymer substrates can be avoided by limiting the temperature variations between −40 and 40 °C. Electrical measurements performed in such temperature range reveal that the resistance of GNP films on LDPE substrates increases as a function of the temperature, unlike the behavior of graphite-based materials in which the temperature coefficient of resistance is negative. The explanation is given by the strong influence of the thermal expansion properties of the LDPE substrates on the thermo-resistive features of GNP coating films. The results show that, narrowing the temperature range from 20 to 40 °C, the GNP on LDPE samples can work as temperature sensors having linear temperature-resistance relationship, while keeping constant the temperature and applying mechanical strains in the 0–4.2 × 10−3 range, they can operate as strain gauges with a gauge factor of about 48.
