Publicação
Desenvolvimento de tecidos revestidos com o poli (3,4- Etilenodioxitofeno) dopado com poli (Sulfonato de Estireno) (PEDOT:PSS) para o autoaquecimento resistivo de têxteis
| Resumo: | This research shows the development of a functional textile, with flexible resistive selfheating properties through the conversion of electricity to heat (Joule effect) and with competitive cost to be used in garments. Conductive polymer technology was used to coat a polyamide 6.6 fabric (PA66) pre-activated by atmospheric DBD plasma treatment. Three types of coatings with 1 and 5 layers were investigated: i) A pure commercial poly (3,4-ethylenedioxythiophene) doped with poly (styrene sulfonate) (PEDOT:PSS); ii) A PEDOT:PSS doped with 5 wt% of ethylene glycol and iii) PEDOT:PSS doped with 5 wt% of glycerol. Polyols were added to provide an increase in electrical conductivity. The coatings were analyzed between 3 and 46 V at the applied current of 2 Ampere. The analyses of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry (TGA), mechanicaldynamic analysis (DMA), scanning electron microscopy with X-ray microanalysis (SEM-EDS) and X-ray diffraction (XRD) show significant changes in morphology, chemistry, enthalpy, crystallinity and glass transition temperature confirming that doped PEDOT:PSS is not only spread over the PA66 yarn surfaces but is dispersed in the bulk facilitating relaxation and increasing structure and chain flexibility. Electrical resistivity and electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) tests confirm that the plasma treated PA66 coated with 5 layers of PEDOT:PSS and doped with 5 wt% of glycerol presents the highest stability, resistance, capacitive behavior and the best ability on storing the electrical energy. This configuration needs only 7.5 V to induce a temperature change up to 38 °C (a temperature higher than human body core temperature) at a current density of 0.3 A g-1. The desired temperature is easily adjustable in function of the applied voltage and by the number of coated layers of PEDOT:PSS. Despite the need to improve the uniformity of the coating thickness on the fabric for uniform heat generation, the observed results are promising since can be compared to the temperature obtained in carbon nanotube composites using similar voltages. This cost-competitive, safe, high flexible and stable thermoelectric fabric ensure its use in large area textiles as heating element in a wide range of applications such as garments, carpets, blankets and automotive seats. |
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| Autores principais: | Moraes, Maria Renata |
| Assunto: | functional textiles polyamide 6.6 conductive polymer PEDOT: PSS Joule effect resistive self-heating têxteis funcionais poliamida 6.6 polímero condutor efeito Joule autoaquecimento resistivo Engenharia e Tecnologia::Outras Engenharias e Tecnologias |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | tese de doutoramento |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | português |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | This research shows the development of a functional textile, with flexible resistive selfheating properties through the conversion of electricity to heat (Joule effect) and with competitive cost to be used in garments. Conductive polymer technology was used to coat a polyamide 6.6 fabric (PA66) pre-activated by atmospheric DBD plasma treatment. Three types of coatings with 1 and 5 layers were investigated: i) A pure commercial poly (3,4-ethylenedioxythiophene) doped with poly (styrene sulfonate) (PEDOT:PSS); ii) A PEDOT:PSS doped with 5 wt% of ethylene glycol and iii) PEDOT:PSS doped with 5 wt% of glycerol. Polyols were added to provide an increase in electrical conductivity. The coatings were analyzed between 3 and 46 V at the applied current of 2 Ampere. The analyses of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry (TGA), mechanicaldynamic analysis (DMA), scanning electron microscopy with X-ray microanalysis (SEM-EDS) and X-ray diffraction (XRD) show significant changes in morphology, chemistry, enthalpy, crystallinity and glass transition temperature confirming that doped PEDOT:PSS is not only spread over the PA66 yarn surfaces but is dispersed in the bulk facilitating relaxation and increasing structure and chain flexibility. Electrical resistivity and electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) tests confirm that the plasma treated PA66 coated with 5 layers of PEDOT:PSS and doped with 5 wt% of glycerol presents the highest stability, resistance, capacitive behavior and the best ability on storing the electrical energy. This configuration needs only 7.5 V to induce a temperature change up to 38 °C (a temperature higher than human body core temperature) at a current density of 0.3 A g-1. The desired temperature is easily adjustable in function of the applied voltage and by the number of coated layers of PEDOT:PSS. Despite the need to improve the uniformity of the coating thickness on the fabric for uniform heat generation, the observed results are promising since can be compared to the temperature obtained in carbon nanotube composites using similar voltages. This cost-competitive, safe, high flexible and stable thermoelectric fabric ensure its use in large area textiles as heating element in a wide range of applications such as garments, carpets, blankets and automotive seats. |
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