具有高热电值的多重异质连接塑料
Dongyang Wang1,2, Jiamin Ding1,2, Yingqiao Ma1
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Nature
|July 24, 2024
概括
研究人员使用一种新的聚合物多异构连接开发了先进的热电塑料. 这一突破显著提高了灵活电子产品中高效的废热能量回收的无维度值 (ZT).
科学领域:
- 材料科学
- 聚合物科学
- 能源采集
背景情况:
- 结合聚合物有助于制造灵活,低成本的热电器件.
- 目前的应用受到低无维度值 (ZT) 的限制.
研究的目的:
- 开发高性能热电塑料.
- 克服现有的高分子热电材料的局限性.
主要方法:
- 聚合物多异构连接的制造,具有周期性双异构连接特征.
- 创建10纳米以下层次的异构连接和相互透的大型异构连接接口.
- 热导电性和电荷传输性能的表征.
主要成果:
- 在368克尔文时达到1.28的无维度功率 (ZT).
- 与单个聚合物相比,其导热率降低了60%以上.
- 提高了功率因子和整体热电性能.
结论:
- 开发的聚合物多异构连接显著提高了热电性能.
- 这种材料优于商业和灵活的热电候选材料.
- 与溶液涂层的兼容性使大面积的,具有成本效益的可穿戴热电技术成为可能.
相关概念视频
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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01:17Thermal Electrocyclic Reactions: Stereochemistry
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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