刷子中的分散性在确定它们的界面特性方面起着重要作用:基于奥利戈沙的移植聚合物的案例
Matteo Romio1,2, Benjamin Grob2, Lucca Trachsel3
1Biointerfaces Lab, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.
Journal of the American Chemical Society
|November 5, 2021
概括
移植聚合物中的侧链异质性显著影响刷水和界面特性. 具有不同侧链长度和分散度的聚合物产生更水合,更少的粘合性和更滑的薄膜.
科学领域:
- 聚合物科学
- 材料科学
- 表面化学
背景情况:
- 移植聚合物模仿生物宏分子但缺乏自然结构纯度.
- 合成聚合物中的侧链异质性尚未得到充分理解.
- 聚合物刷的界面特性对于各种应用至关重要.
研究的目的:
- 研究侧链异质性对聚合物刷特性的影响.
- 展示不同侧链长度和分散程度如何影响水分和界面行为.
- 合成和描述具有受控侧链结构的移植聚合物.
主要方法:
- 通过离子环开放聚合 (CROP) 合成基二甲酸 (OEOXMAs).
- 使用柱状染色法将OEOXMA净化为具有特定长度 (n) 的离散宏素.
- 通过可逆添加碎片链转移 (RAFT) 聚合,将纯化的OEOXMA转化为多甲酸 (POEOXMA).
- 在黄金表面上组装POEOXMA以形成移植聚合物刷.
- 使用可变角度光谱圆测量 (VASE),散射式石英晶微平衡 (QCMD) 和原子力显微镜 (AFM) 进行刷子特性测定.
主要成果:
- 在移植聚合物中的侧链分散性显著影响了刷子的水分.
- 不同质的侧链结构导致相比同质的聚合物刷更多的水分.
- 具有不同侧链分散性的移植聚合物刷具有较低的粘附性和增强的滑性.
- 这些异构的刷子表现出改善的生物传递性.
结论:
- 侧链异质性是调整聚合物刷特性的一个关键因素.
- 控制侧链长度和分散性的变化为设计先进的接口材料提供了途径.
- 这些发现对生物材料,涂层和传感器的设计有影响.
相关概念视频
Characteristics and Nomenclature of Copolymers
2.9K
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...
2.9K
Polymers: Molecular Weight Distribution
4.0K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
4.0K
Polymer Classification: Architecture
3.2K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
3.2K
Polymer Classification: Crystallinity
3.3K
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...
3.3K
Molecular Weight of Step-Growth Polymers
2.5K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.5K
Olefin Metathesis Polymerization: Overview
2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K


