Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer,ACS Macro Letters

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Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer
ACS Macro Letters ( IF 5.1 ) Pub Date : 2021-10-19 , DOI: 10.1021/acsmacrolett.1c00567
Jiae Seo ₁ , Bitgaram Kim ₁ , Min-Seok Kim ₂ , Ji-Hun Seo ₁

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While piezoelectric materials are applied in various fields, they generally exhibit poor mechanical toughness. To increase the applicability of these, their mechanical properties need to be improved. In this study, a tough piezoelectric polyrotaxane (PRX) elastomer was developed by blending PRX samples of two different lengths, formed using 10K and 35K poly(ethylene glycol), to align dipole moments for optimization of the piezoelectricity characteristics. The effects of the blending ratio on the crystalline structure of the obtained PRX elastomer were investigated by X-ray diffraction analysis and transmission electron microscopy. In addition, the ferroelectric and piezoelectric properties of the PRX elastomer were evaluated based on its polarization hysteresis loop and voltage generation characteristics, respectively. The PRX elastomer formed by using a ratio of 3:1 (ePR10k₇₅35k₂₅) exhibited a long-range-ordered anisotropic crystalline structure, resulting in a large polarization (P_r) value. As a result, ePR10k₇₅35k₂₅ showed greatly enhanced piezosensitivity against the mechanical vibrations generated by respiratory signals.

中文翻译：

强韧压电弹性体分子项链状聚轮烷各向异性晶体结构的优化

虽然压电材料应用于各个领域，但它们通常表现出较差的机械韧性。为了增加这些的适用性，需要改进它们的机械性能。在这项研究中，通过混合使用 10K 和 35K 聚（乙二醇）形成的两种不同长度的 PRX 样品，开发了一种坚韧的压电聚轮烷 (PRX) 弹性体，以对齐偶极矩以优化压电特性。通过X射线衍射分析和透射电子显微镜研究了共混比对所得PRX弹性体晶体结构的影响。此外，还分别根据其极化磁滞回线和电压产生特性评估了 PRX 弹性体的铁电和压电性能。₇₅ 35k ₂₅ ) 表现出长程有序的各向异性晶体结构，导致极化（P _r）值大。结果，ePR10k ₇₅ 35k ₂₅对呼吸信号产生的机械振动表现出显着增强的压电敏感性。

更新日期：2021-11-16

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