Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei 10617, Taiwan.
Sensors (Basel). 2023 Apr 7;23(8):3813. doi: 10.3390/s23083813.
In this study, a polyvinylidene fluoride (PVDF)/graphene nanoplatelet (GNP) micro-nanocomposite membrane was fabricated through electrospinning technology and was employed in the fabrication of a fiber-reinforced polymer composite laminate. Some glass fibers were replaced with carbon fibers to serve as electrodes in the sensing layer, and the PVDF/GNP micro-nanocomposite membrane was embedded in the laminate to confer multifunctional piezoelectric self-sensing ability. The self-sensing composite laminate has both favorable mechanical properties and sensing ability. The effects of different concentrations of modified multiwalled carbon nanotubes (CNTs) and GNPs on the morphology of PVDF fibers and the -phase content of the membrane were investigated. PVDF fibers containing 0.05% GNPs were the most stable and had the highest relative -phase content; these fibers were embedded in glass fiber fabric to prepare the piezoelectric self-sensing composite laminate. To test the laminate's practical application, four-point bending and low-velocity impact tests were performed. The results revealed that when damage occurred during bending, the piezoelectric response changed, confirming that the piezoelectric self-sensing composite laminate has preliminary sensing performance. The low-velocity impact experiment revealed the effect of impact energy on sensing performance.
在这项研究中，通过静电纺丝技术制备了一种聚偏二氟乙烯（PVDF）/石墨烯纳米片（GNP）微纳复合膜，并将其用于纤维增强聚合物复合材料层压板的制造。用一些玻璃纤维代替碳纤维作为传感层的电极，并将 PVDF/GNP 微纳复合膜嵌入层压板中，赋予其多功能的压电自感知能力。自感知复合层压板具有良好的机械性能和感知能力。研究了不同浓度的改性多壁碳纳米管（MWNTs）和 GNPs 对 PVDF 纤维形态和膜中 - 相含量的影响。含有 0.05%GNP 的 PVDF 纤维最稳定，具有最高的相对 - 相含量；这些纤维被嵌入玻璃纤维织物中，以制备压电自感知复合层压板。为了测试层压板的实际应用，进行了四点弯曲和低速冲击试验。结果表明，当弯曲过程中发生损伤时，压电响应发生变化，证实了压电自感知复合层压板具有初步的传感性能。低速冲击试验揭示了冲击能量对传感性能的影响。
