通过简单地添加核剂来提高半晶导体聚合物的热电性能
Chen Chen1, Haibao Ma2,3,4,5, Kaiqing Lu2,3,5,6
1Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, China.
Advanced materials (Deerfield Beach, Fla.)
|January 19, 2025
概括
研究人员使用核化剂提高了半导体聚合物的热电性能. 添加N,N,N 的时间.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 热电学是一种热电学.
背景情况:
- 在半导体聚合物中优化热电性能需要精确的微观结构控制.
- 目前用于微结构控制的方法,如对齐,往往是复杂和具有挑战性的.
- 传统聚合物工业中常见的核剂提供了一个潜在的更简单的方法.
研究的目的:
- 研究一种简单的策略来增强半晶聚合物薄膜的热电特性.
- 探索使用最小量的核化剂来调节聚合物结晶的方法.
- 为了优化N,N'-(1,4-phenyl) diisonicotinamide (PDA) 作为PBTTT-C14中的核化剂的加载.
主要方法:
- 混合不同低度 (小于1重量%) 的N,N'-(1,4-phenyl) diisonicotinamide (PDA) 合成多,2,5-bis,3-alkylthiophen-2-yl) thieno [3,2-b] thiophene) (PBTTT-C14). 这种混合物可以在不同度 (小于1重量%) 的N,N'-(1,4-phenyl) diisonicotinamide (PDA) 中混合,使其成为多,2,5-bis,3-alkylthiophen-2-yl) thieno [3,2-b] thiophene (PBTTT-C14).
- 系统地调查结晶行为和结构障碍.
- 测量电导率和功率因子,然后进行离子交换兴奋剂.
主要成果:
- 最佳的PDA负荷为0.9%的重量%,使PBTTT-C14薄膜的结晶度增加了45%.
- 经PDA修改的片实现了最大的电导率为1,894 S cm-1和功率系数为176 μW m-1 K-2,比原始片有了显著的改进.
- 增强的电荷传输效率归因于聚合物链延伸和降低的颗粒边界阻力.
结论:
- 最少添加PDA等核化剂是一种有效的策略,可以控制半导体聚合物微观结构并增强热电特性.
- 优化的PDA修改型PBTTT-C14薄膜显示出卓越的热电性能.
- 这种方法为开发先进的热电材料和基于聚合物的电子产品提供了途径.
相关概念视频
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K
01:26Polymer Classification: Stereospecificity
2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
01:21Polymer Classification: Crystallinity
2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K