块共聚合物的纳米粒子驱动组装:一种简单的途径,以订购混合材料
Ying Lin1, Vikram K Daga, Eric R Anderson
1Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, USA.
Journal of the American Chemical Society
|April 13, 2011
概括
添加选择性结以阻断共聚物质的纳米粒子,可以在无序的材料中引发秩序. 这允许在高颗粒负载下创建具有不同结构的有序混合材料.
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:
- 块共聚物经常形成无序的结构.
- 在块共聚合物系统中控制自组装对于先进材料至关重要.
研究的目的:
- 用纳米粒子演示一种在无序块共聚合物系统中诱导秩序的方法.
- 为了使能够制造有序的混合材料与控制的纳米结构.
主要方法:
- 纳米颗粒和块共聚合物段之间的选择性键.
- 使用传输电子显微镜 (TEM) 和小角度X射线散射 (SAXS) 进行表征.
主要成果:
- 在无序的区块共聚合物系统中引入秩序.
- 制造具有球形,圆柱形或片状域的混合材料.
- 在超出40%的纳米粒子负载下成功制造材料.
结论:
- 选择性纳米粒子-块共聚物相互作用可以直接自我组装.
- 这种方法为订购混合材料提供了一个简单的途径.
- 该方法适用于各种纳米粒子和块共聚合物,为功能设备铺平了道路.
相关概念视频
Characteristics and Nomenclature of Copolymers
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Cationic 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,...


