The orderly and large area near-field electrospun PVDF fibers via multi-spinnerets and cylindrical glass tube

• Main Authors: Yan-Liang Lin, 林晏良
• Other Authors: Cheng-Tang Pan
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/22wx77

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === In this study, we improved the near-field electrospinning by multi-spinnerets with a hollow cylindrical collector to fabricate mass and big area permanent piezoelectricity of PVDF (Polyvinylidene fluoride) fibers array. We innovatively designed multi-spinnerets by PCB (Printed circuit board) and drilled spinnerets on the solder balls. With different process parameters, we could obtain different PVDF fiber diameters. By Taguchi method analysis, we found the optimum sample of PVDF fibers array were manufactured by electric field of 1.6 x 107 V /m, the fibers collector tangential velocity of 1779.9 mm/s, and the heat treatment temperature of 65 degrees at one hour. In addition, we used X-ray diffraction (XRD) and Scanning electron microscopy (SEM) to analyze β-phase crystal quality and the surface characterization of PVDF fibers, respectively. From the observation of XRD (X-ray diffraction), XRD result revealed a high diffraction peak at 2θ=20.6° of piezoelectric crystal β-phase structure. As PVDF solution (concentration of 18% wt and the conductivity of 44.2 μS/cm )was spun through near-field electrospinning by multi-spinnerets, we obtained a smooth manufacturing process. As a result of this study, we applied regularly stretching and releasing at 9 Hz vibration, and a maximum peak voltage of 86.9 mV was generated. In cicada wing test, vibration input during 10 ~ 50 Hz , and we obtained the maximum output voltage signals of 6.2 mV. These good piezoelectric PVDF fibers with high flexibility at low cost, electrical energy conversion, availability in generating energy from low-frequency vibration of environment, and various thicknesses and shapes can be applied at energy harvesting, sensor and actuation.