铁电聚合物表现出类似于形态相界的行为
Yang Liu1, Haibibu Aziguli1, Bing Zhang2
1Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
Nature
|October 5, 2018
概括
研究人员开发了一种新方法来增强聚合物的压电性,通过诱导聚乙烯化物-三乙烯 (PVDF-TrFE) 共聚物的形态相边界行为. 这一突破使得高性能弹性压电器件成为可能.
科学领域:
- 材料科学
- 铁电行业
- 聚合物科学
背景情况:
- 压电,即机械能量转化为电能,在铁电矿的形态相边界 (MPB) 显著增强,推动了传感器和执行器的应用.
- 在有机材料中没有观察到MPB,这限制了基于聚合物的高性能柔性,可穿戴和生物相容的压电器件的开发.
- 改善聚合物的内在压电反应仍然是先进电子应用的挑战.
研究的目的:
- 研究铁电聚乙烯化物-三乙烯 (PVDF-TrFE) 共聚物的立体化学诱导行为.
- 探索在有机铁电材料中创建类似MPB的过渡区域的可能性.
- 增强聚合物的压电特性,使其更广泛地应用.
主要方法:
- 使用第一原理计算来了解链策略性在P ((VDF-TrFE) 共聚物中的作用.
- 通过策略驱动的晶体阶段研究了分子内秩序变异的演变.
- 分析了跨平面和3/1螺旋相之间的结构竞争.
主要成果:
- 证明P ((VDF-TrFE) 共聚物的战术性会诱导一种类似MPB的过渡区域,同时具有铁电和放松性.
- 证实了链战术在通过结构性竞争形成这个过渡区域的关键作用.
- 在形态组合P ((VDF-TrFE) 共聚合物中达到-63.5 pC/N的纵向压电系数,超过现有的压电聚合物.
结论:
- 在P(VDF-TrFE) 共聚物的立体化学诱导行为成功地模仿了矿中观察到的MPB效应.
- 量身定制的策略为有机材料实现高压电性能提供了新的途径.
- 这项研究为灵活可穿戴电子产品的可扩展,高性能压电聚合物铺平了道路.
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