In this research, we developed piezoelectric fiber material based on melt spinning process to control the electrical properties of biomass polymer PLA. Piezoelectric properties enhancement of PLLA/BaTiO3 fibers by controlling the draw ratio and temperature of the pilot scale melt-spinning process. W...
In this research, we developed piezoelectric fiber material based on melt spinning process to control the electrical properties of biomass polymer PLA. Piezoelectric properties enhancement of PLLA/BaTiO3 fibers by controlling the draw ratio and temperature of the pilot scale melt-spinning process. We confirmed that structural development of the PLLA/BaTiO3 fibers was accompanied by crystal-phase transitions that could be enhanced with higher draw ratios and temperatures. The b-phase transition of PLLA/BaTiO3 fibers exhibited as the draw ratio increased. However, it also could be undergo the fracture process with lamella slippage under an excessive draw ratio. In case of draw temperature, the crystal transition and crystallinity were increased up to 120 °C, but decreased again at higher temperature. This results was related to a decrease in tensile stress applied to the fibers as temperature increases. The maximum output voltage was observed from the fibers obtained with a draw ratio of 3 and temperature of 120 °C. The piezoelectric textile created from the developed PLLA/BaTiO3 fibers generated output currents of up to 911 nA in fast-tapping mode. Our flexible and stretchable PLLA/BaTiO3 fiber can be employed as an environmentally friendly sensor and may further the development of wearable electronics by the electronic textile industry. In the second study, we developed highly porous nonwoven TPU/PP-based TENGs, which were flexible and breathable, for wearable devices. We investigated the influence of the basis weight of nonwoven PP on the triboelectric performance of TENGs. Owing to the highly porous nonwoven structure with a high air volume, the interface layer between the two counter triboelectric layers were not fully in contact even when they were integrated. Thus, the TENG could harvest energy under different external forces and frequencies. Under walking and running motions, our TPU/PP50 N-TENG provided an output voltage and current of 110.18 ± 6.06 V and 7.28 ± 0.67 µA, respectively. Thus, we fabricated a facile, breathable, and flexible generator fully based on fibers, which can be applied in wearable devices. Lastly, we investigated piezoelectric enhancement of PLLA/BaTiO3 spunbond nonwoven by controlling the drawing speed and weight, density of nonwoven of the pilot scale spunbond process. As in the case of the filament spinning process, we confirmed that structural development of the PLLA/BaTiO3 spunbond nonwoven was accompanied by crystal-phase transitions that could be enhanced with higher drawing speed. The maximum output voltage was observed from the spunbond nonwoven obtained with a drawing speed of 5km/min and basic weight of 40g/m2. The piezoelectric nonwoven created from the spunbond process generated output currents of up to 911 nA in fast-tapping mode. This study suggested that biodegradable PLA/BaTiO3 materials selection and morphological modification alone were sufficient to produce piezoelectric materials with excellent electrical properties, high mechanical performance, and a long service lifespan.
In this research, we developed piezoelectric fiber material based on melt spinning process to control the electrical properties of biomass polymer PLA. Piezoelectric properties enhancement of PLLA/BaTiO3 fibers by controlling the draw ratio and temperature of the pilot scale melt-spinning process. We confirmed that structural development of the PLLA/BaTiO3 fibers was accompanied by crystal-phase transitions that could be enhanced with higher draw ratios and temperatures. The b-phase transition of PLLA/BaTiO3 fibers exhibited as the draw ratio increased. However, it also could be undergo the fracture process with lamella slippage under an excessive draw ratio. In case of draw temperature, the crystal transition and crystallinity were increased up to 120 °C, but decreased again at higher temperature. This results was related to a decrease in tensile stress applied to the fibers as temperature increases. The maximum output voltage was observed from the fibers obtained with a draw ratio of 3 and temperature of 120 °C. The piezoelectric textile created from the developed PLLA/BaTiO3 fibers generated output currents of up to 911 nA in fast-tapping mode. Our flexible and stretchable PLLA/BaTiO3 fiber can be employed as an environmentally friendly sensor and may further the development of wearable electronics by the electronic textile industry. In the second study, we developed highly porous nonwoven TPU/PP-based TENGs, which were flexible and breathable, for wearable devices. We investigated the influence of the basis weight of nonwoven PP on the triboelectric performance of TENGs. Owing to the highly porous nonwoven structure with a high air volume, the interface layer between the two counter triboelectric layers were not fully in contact even when they were integrated. Thus, the TENG could harvest energy under different external forces and frequencies. Under walking and running motions, our TPU/PP50 N-TENG provided an output voltage and current of 110.18 ± 6.06 V and 7.28 ± 0.67 µA, respectively. Thus, we fabricated a facile, breathable, and flexible generator fully based on fibers, which can be applied in wearable devices. Lastly, we investigated piezoelectric enhancement of PLLA/BaTiO3 spunbond nonwoven by controlling the drawing speed and weight, density of nonwoven of the pilot scale spunbond process. As in the case of the filament spinning process, we confirmed that structural development of the PLLA/BaTiO3 spunbond nonwoven was accompanied by crystal-phase transitions that could be enhanced with higher drawing speed. The maximum output voltage was observed from the spunbond nonwoven obtained with a drawing speed of 5km/min and basic weight of 40g/m2. The piezoelectric nonwoven created from the spunbond process generated output currents of up to 911 nA in fast-tapping mode. This study suggested that biodegradable PLA/BaTiO3 materials selection and morphological modification alone were sufficient to produce piezoelectric materials with excellent electrical properties, high mechanical performance, and a long service lifespan.
주제어
#piezoelectric triboelectric energy harvesting spun laid nonwoven melt spinning
학위논문 정보
저자
양병진
학위수여기관
전북대학교 일반대학원
학위구분
국내박사
학과
유기소재파이버공학
지도교수
정용식
발행연도
2023
총페이지
xii, 136 p.
키워드
piezoelectric triboelectric energy harvesting spun laid nonwoven melt spinning
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