Enhanced Piezoelectric Properties of Poly(Vinylidenefluoride-Co-Trifluoroethylene)/Carbon-Based Nanomaterial Composite Films for Pressure Sensing Applications.
Enhanced Piezoelectric Properties of Poly(Vinylidenefluoride-Co-Trifluoroethylene)/Carbon-Based Nanomaterial Composite Films for Pressure Sensing Applications.
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DOI：
10.3390/polym12122999
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发表时间：
2020-12-16
期刊：
影响因子：
5
通讯作者：
Chiu CW
中科院分区：
文献类型：
--
作者：
Li JW;Huang CY;Chen KY;Chen JX;Hsu XY;Chen YF;Kuo CJ;Cheng CC;Suen MC;Chiu CW
在这项研究中，对聚偏二氟乙烯-三氟乙烯（PVDF-TrFE）薄膜进行加热和极化处理，以提高其结晶度和压电效应。将多维碳基纳米材料（CBN）（即改性零维（0D）炭黑（OCB）、一维（1D）改性碳纳米管（CNT-COOH）和二维（2D）氧化石墨烯（GO））添加到共聚物中，以提高其结晶度和压电效应。研究了不同CBN尺寸对PVDF-TrFE薄膜结晶度和压电效应的影响，此外，添加两亲性聚合物分散剂以改善CBN的分散性；通过苯乙烯-马来酸酐共聚物（SMAz）和聚氧化烯胺（M1000）的酰胺化和酰亚胺化反应合成了不同CBN与分散剂比例（z =）的聚合物溶液。制备了10：1、5：1、1：5、1：10），增强的分散性使得PVDF-TrFE分子链中的氟原子能够更有效地与CBN中的-COOH基团形成氢键，从而增加了薄膜的β晶相（压电效应的起源）的含量，因此所得薄膜在应用侧表现出更高的输出电压，并且在传感元件上表现出更好的灵敏度。 CNT-COOH和聚合物分散剂将PVDF-TrFE中的β相含量从73.6%增加到86.4%，从而将压电系数从19.8±1.0提高到26.4±1.3pC/N，复合薄膜压力传感器还表现出高灵敏度，预计在未来具有商业潜力。
In this study, heat and polarization treatments were applied to poly(vinylidenefluoride-co-trifluoroethylene (PVDF-TrFE) films to improve their crystallinity and piezoelectric effect. Carbon-based nanomaterials (CBNs) of multiple dimensions (i.e., modified zero-dimensional (0D) carbon black (OCB), one-dimensional (1D) modified carbon nanotubes (CNT–COOH) and two-dimensional (2D) graphene oxide (GO)) were added to the copolymer to study the effects of different CBN dimensions on the crystallinity and piezoelectric effect of PVDF-TrFE films. Additionally, amphiphilic polymeric dispersants were added to improve the dispersibility of CBNs; the dispersant was synthesized by the amidation, and imidization reactions of styrene-maleic anhydride copolymer (SMAz) and polyoxyalkylene amine (M1000). Polymer solutions with different ratios of CBN to dispersant (z = 10:1, 5:1, 1:1, 1:5, 1:10) were prepared. The enhanced dispersibility enabled the fluorine atoms in the PVDF-TrFE molecular chain to more efficiently form hydrogen bonds with the –COOH group in the CBN, thereby increasing the content of the β crystal phase (the origin of the piezoelectric effect) of the film. Therefore, the resulting film exhibited a higher output voltage on the application side and better sensitivity on the sensing element. The addition of CNT–COOH and polymeric dispersants increased the β-phase content in PVDF-TrFE from 73.6% to 86.4%, which in turn raised the piezoelectric coefficient from 19.8 ± 1.0 to 26.4 ± 1.3 pC/N. The composite film-based pressure sensor also exhibited a high degree of sensitivity, which is expected to have commercial potential in the future.
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影响因子：
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作者：
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