通过自组合的结晶线圈聚酸-b-聚乙烯 (PP-b-PS) 块共聚物质的度驱动可逆形态转换
Luis Quirós-Montes1, David Presa-Soto1, Raquel de la Campa1
1Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica Enrique Moles (IUQOEM), Universidad de Oviedo, Julián Clavería 8, Oviedo, Spain.
Chemistry (Weinheim an der Bergstrasse, Germany)
|March 24, 2025
概括
在THF自组装中变化聚-[bis{(trifluoroethoxy) phosphazene]-b-poly{(styrene) 块共聚合物的度会产生多样化的纳米结构. 这种方法控制了PTFEP的结晶性,使先进材料的可调节纳米形态成为可能.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 是一种材料科学.
- 纳米技术 纳米技术
背景情况:
- 块共聚合物自组装成各种纳米结构.
- 控制纳米形态对于先进的材料设计至关重要.
- 了解自我组装机制指导了材料的发展.
研究的目的:
- 为了证明在聚-[bis(trifluoroethoxy) 酸]-b-poly(styrene) (PTFEP-b-PS) 块共聚合物自组装中的纳米形态的控制.
- 研究初始共聚合物度对纳米结构形成的影响.
- 阐明形态转换的机制和PTFEP结晶性的作用.
主要方法:
- PTFEP-b-PS区块共聚物的自组装在四水富兰 (THF) 中,度不同.
- 使用识别球形,双连续,圆形,圆柱形和囊状结构的技术进行形态表征.
- 在现场研究和广角X射线衍射 (WAXD) 来分析结构转变和PTFEP阻断晶度.
主要成果:
- 通过调整 PTFEP-b-PS 度,形成了多种纳米形态,包括球形,双连续形,圆形,圆柱形和囊状.
- 观察到像"花样"的大型复合菌根 (LCM) 和穿孔菌根这样的中间结构,揭示了过渡途径.
- 随着度 (超过2毫克/毫升) 的增加,PTFEP块结晶性增加,与形态变化 (从 toroidal 到圆柱形和囊状结构) 相对应.
- 在现场研究中捕获了状到圆柱状的细胞转变和"章鱼样"结构.
结论:
- 最初的共聚合物度是一个简单而有效的参数来控制PTFEP-b-PS的自我组装到各种纳米形态.
- 通过度调节的PTFEP晶体性,在决定最终纳米结构方面发挥着关键作用.
- 该系统为设计具有可调节性质的先进纳米结构材料提供了巨大的潜力.
相关概念视频
Polymer Classification: Crystallinity
2.7K
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...
2.7K
Characteristics and Nomenclature of Copolymers
2.4K
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...
2.4K
Step-Growth Polymerization: Overview
3.4K
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...
3.4K
Cationic 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


