通过"点击"合,使单壁碳纳米管与精确定义的聚乙烯功能化
Huaming Li1, Fuyong Cheng, Andy M Duft
1Department of Chemistry and Brockhouse Institute for Materials Research (BIMR), McMaster University, Hamilton, Ontario L8S 4M1, Canada.
Journal of the American Chemical Society
|October 13, 2005
概括
这项研究使用点击化学有效地创建了聚合物-纳米管结合物. 由此产生的材料在单壁碳纳米管 (SWNT) 上呈现均的聚合物涂层,提高了它们的溶解性.
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
- 纳米技术 纳米技术
背景情况:
- 单壁碳纳米管 (SWNT) 具有独特的特性,但往往具有较差的可溶性和可加工性.
- 功能化对于定制SWNT属性并将其集成到复合材料中至关重要.
- 点击化学提供了一种可靠的方法,用于对纳米材料进行共价改性.
研究的目的:
- 为了实现高效的化装饰SWNTs与化终结聚烯的共价功能化.
- 为了描述由此产生的聚合物-纳米管结合物.
- 研究功能化对SWNT属性和形态学的影响.
主要方法:
- ((I) 催化 [3 + 2] 惠斯根循环添加物用于聚合物结合.
- 红外 (IR) 和拉曼光谱用于化学表征.
- 热重力测量分析 (TGA) 用于确定聚合物含量.
- 传输电子显微镜 (TEM) 和原子力显微镜 (AFM) 用于形态分析.
主要成果:
- 在24小时内在60°C下高效合成有机溶性聚合物-SWNT合物.
- 确定CuI和1,8-diazabicyclo[5.4.0]undec-7-ene作为最佳的催化剂和添加剂.
- 光谱证据证实了基因的成功功能化和sp2到sp3的碳转化.
- TGA揭示了高达45%的聚合物含量,这表明大约每200-700个碳素有一个聚合物链.
- 显微镜显示单个,解体的SWNTs上的均聚合物涂层.
结论:
- (I) 催化点击化学提供了一种有效的途径,可将聚乙烯联到SWNTs.
- 由此产生的聚合物-SWNT合物具有更好的溶解性和均的表面覆盖.
- 这种方法为开发具有定制性质的先进纳米材料提供了一个有前途的战略.
更多相关视频
09:12Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
Published on: June 1, 2016
11:09Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
Published on: April 1, 2018
相关概念视频
01:04Anionic Chain-Growth Polymerization: Mechanism
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
00:57Cationic Chain-Growth Polymerization: Mechanism
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 generated carbocation,...