非共价平面化相互作用产生高度有序和热热的液晶结合聚合物
Sina Sabury1, Zhuang Xu2, Shamil Saiev3
1School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. reynolds@chemistry.gatech.edu.
Materials horizons
|April 30, 2024
概括
这项研究引入了一种新的结合聚合物,TPT-TT,它利用分子内相互作用来实现有序的固态结构. 这种聚合物的热显著提高了其电导率和有机场效应晶体管的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 有机电子 有机电子
背景情况:
- 控制合聚合物形态是有机电子学的关键.
- 结构操纵影响了聚合物的组装和特性.
研究的目的:
- 报告一个具有氧化还原活性的结合聚合物,TPT-TT,具有分子内相互作用.
- 研究这些相互作用如何影响主链平面性和固态秩序.
- 探索由此产生的热otropic液体晶体行为及其对薄膜形态和设备性能的影响.
主要方法:
- 密度函数理论 (DFT) 计算用于研究分子内相互作用.
- 交叉极化光学显微镜 (CPOM) 和差分扫描热量计 (DSC) 来分析热热流体液晶的行为.
- 草地发射率X射线衍射 (GIXD) 来表征薄膜远程顺序.
- 有机场效应晶体管 (OFET) 的制造和测试.
主要成果:
- TPT-TT表现出分子内SO和SH-C相互作用,促进脊柱平面化和温度依赖的聚合.
- 观察并描述了热热的液晶态行为 (nematic 和 smectic A 阶段).
- 热处理的结果是高度排序的薄膜,具有增强的电导率 (55 S cm-1).
- 化膜显示电荷载体移动性得到改善 (1.4 ± 0.1 × 10−2 cm2 V−1 s−1) 和100%的OFET装置产量.
结论:
- 结合分子内部相互作用的分子设计可以控制结合聚合物固态秩序.
- 液晶性促进了热回火,从而增强了形态和电子性能.
- 这种方法为高性能有机电子设备提供了一条途径.
相关概念视频
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
01:26Polymer 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
02:11Conformations of Cyclohexane
12.4K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.4K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.3K
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...
2.3K
02:56Intermolecular Forces and Physical Properties
20.8K
20.8K
01:03Step-Growth Polymerization: Overview
3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.5K