Nguyen Duc-Nam, Moon Wonkyu
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyojadong, Namgu, Pohang 37673, Kyungbuk, Korea.
Faculty of Mechanical Engineering and Mechatronics, PHENIKAA University, Hanoi 12116, Vietnam.
Polymers (Basel). 2022 Apr 25;14(9):1739. doi: 10.3390/polym14091739.
Electrospinning is a low-cost and straightforward method for producing various types of polymers in micro/nanofiber form. Among the various types of polymers, electrospun piezoelectric polymers have many potential applications. In this study, a new type of functional microfiber composed of poly(γ-benzyl-α,L-glutamate) (PBLG) and poly(vinylidene fluoride) (PVDF) with significantly enhanced electromechanical properties has been reported. Recently reported electrospun PBLG fibers exhibit polarity along the axial direction, while electrospun PVDF fibers have the highest net dipole moment in the transverse direction. Hence, a combination of PBLG and PVDF as a core-shell structure has been investigated in the present work. On polarization under a high voltage, enhancement in the net dipole moment in each material and the intramolecular conformation was observed. The piezoelectric coefficient of the electrospun PBLG/PVDF core-shell fibers was measured to be up to 68 pC N (d), and the voltage generation under longitudinal extension was 400 mVpp (peak-to-peak) at a frequency of 60 Hz, which is better than that of the electrospun homopolymer fibers. Such new types of functional materials can be used in various applications, such as sensors, actuators, smart materials, implantable biosensors, biomedical engineering devices, and energy harvesting devices.
静电纺丝是一种低成本且简便的方法，用于生产微/纳米纤维形式的各种聚合物。在各种类型的聚合物中，静电纺丝的压电聚合物有许多潜在应用。在本研究中，已报道了一种由聚（γ-苄基-α，L-谷氨酸）（PBLG）和聚偏二氟乙烯（PVDF）组成的新型功能微纤维，其机电性能显著增强。最近报道的静电纺丝PBLG纤维沿轴向表现出极性，而静电纺丝PVDF纤维在横向具有最高的净偶极矩。因此，在本工作中研究了PBLG和PVDF作为核壳结构的组合。在高压下极化时，观察到每种材料的净偶极矩和分子内构象都有所增强。静电纺丝PBLG/PVDF核壳纤维的压电系数测量值高达68 pC N（d），在60 Hz频率下纵向拉伸时的电压产生为400 mVpp（峰峰值），这比静电纺丝均聚物纤维的性能更好。这种新型功能材料可用于各种应用，如传感器、致动器、智能材料、可植入生物传感器、生物医学工程设备和能量收集设备。
