Related Experiment Video
Updated: Oct 13, 2025
06:56
Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
Published on: October 10, 2013
39.9K
Polymethylene Brushes via Surface-Initiated C1 Polyhomologation
Feng Li1, Sophia Thiele1, Harm-Anton Klok1
1Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères, École Polytechnique Fédérale de Lausanne (EPFL), Batiment MXD, Station 12, CH-1015 Lausanne, Switzerland.
Journal of the American Chemical Society
|November 18, 2021
Summary
This study introduces a new method for creating well-defined polymethylene brushes on surfaces using surface-initiated C1 polyhomologation. This technique allows for controlled polymer growth and versatile surface modification for complex polymer architectures.
Area of Science:
- Polymer Chemistry
- Surface Science
- Materials Science
Background:
- Surface-initiated polymerization is key for creating polymer brushes.
- Controlled synthesis of polymer architectures is crucial for advanced materials.
Purpose of the Study:
- To develop a novel synthetic strategy for structurally well-defined hydrocarbon polymer brushes.
- To enable controlled molecular weights and complex surface-attached polymer architectures.
Main Methods:
- Utilizing an alkylboronic acid pinacol ester initiator for unidirectional chain growth.
- Employing surface-initiated C1 polyhomologation of dimethylsulfoxonium methylide.
- Demonstrating compatibility with photopatterning for micropatterned films.
Main Results:
- Achieved controlled molecular weights and well-defined polymethylene brushes.
- Successfully generated micropatterned polymethylene brush films.
- Demonstrated chain-end modification of boronic ester to hydroxyl groups for further functionalization.
Conclusions:
- The developed methodology provides access to structurally defined hydrocarbon polymer brushes.
- This approach facilitates the creation of complex surface-anchored polymer architectures, including block copolymers.
- The technique is compatible with photopatterning, enabling versatile surface engineering.
More Related Videos
Related Concept Videos
00:57Cationic Chain-Growth Polymerization: Mechanism
2.5K
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...
2.5K
01:13Olefin 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
01:16Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.8K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.8K
01:24Characteristics 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
01:00Characteristics and Nomenclature of Homopolymers
3.5K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.5K
02:34Polymers
38.1K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
38.1K