多壁碳纳米管包覆聚甲基丙烯酸甲酯分散热塑性聚氨酯复合材料的压敏应用

Macromol Pub Date : 2022-06-06 DOI:10.3390/macromol2020014
Syed Muhammad Imran, Gwang-Myeong Go, M. Hussain, M. Al‐harthi
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引用次数: 3

摘要

热塑性聚氨酯(TPU)由于其柔软性和形状记忆性而被广泛应用于各种压力传感应用。本文报道了一种新型基于tpu的三维结构(3D)压敏复合材料的熔融混合合成方法。首先用多壁碳纳米管(MWCNT)包裹不同尺寸(5,10和20µm)的聚甲基丙烯酸甲酯(PMMA)微珠,然后将其掺入TPU基质中,与没有PMMA微珠相比,实现了早期的导电渗透阈值。MWCNT涂层PMMA珠的添加通过创建3D导电网络减少了TPU绝缘面积,最终反映了外部压力下的早期渗透阈值。Raman显微镜和XRD结果证实MWCNT包覆在PMMA微珠表面效果良好。压力敏感性结果也证实了复合材料的电阻随外加压力的增加而降低。PMMA珠粒尺寸为10µm的复合材料对电阻随压力增加的线性响应最明显,应变计因子值(3.15)高于其他复合材料(20µm和5µm时分别为2.78和2.42)。通过扫描电镜、电容、渗透率和导热系数测量对复合材料的微观结构进行了分析,以支持上述证据。结果支持这种新型复合材料作为压力传感应用的潜在候选材料的适用性。
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Multiwalled Carbon Nanotube-Coated Poly-Methyl Methacrylate Dispersed Thermoplastic Polyurethane Composites for Pressure-Sensitive Applications
Thermoplastic polyurethane (TPU) is a widely used polymer for a variety of pressure sensing applications because of its softness and shape memory. This work reports the synthesis of novel TPU-based three-dimensional structured (3D) pressure-sensitive composites via the melt mixing method. Poly-methyl methacrylate (PMMA) microbeads of different sizes (5, 10, and 20 µm) were first coated with multi-walled carbon nanotubes (MWCNT) and then incorporated into the TPU matrix for achieving an early electro conductive percolation threshold compared to without PMMA beads. The addition of MWCNT coated PMMA beads reduced the TPU insulated areas by creating a 3D conductive network that finally reflected the early percolation threshold during external pressure. Raman microscopy and XRD results confirmed the MWCNT coated nicely on the surface of PMMA beads. The pressure sensitivity results also confirmed the decrease in resistance of the composites with the increase in the applied external pressure. Composites with 10 µm PMMA bead size showed the most linear responses to the decrease in resistance with increasing pressure and showed a higher strain gauge factor value (3.15) as compared to other composites, which had values of 2.78 and 2.42 for 20 and 5 µm, respectively. Microstructure analysis of the composites by SEM, capacitance, permeability, and thermal conductivity measurements was also investigated to support the above evidence. The results support the suitability of this novel composite as a potential candidate for pressure sensing applications.
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