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Capillary Microfluidic-Assisted Surface Structuring.

Wei Li¹, Wenbo Sheng¹, Erik Wegener¹

¹Chair of Macromolecular Chemistry, Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, Mommsenstr. 4, 01069 Dresden, Germany.

ACS Macro Letters

|June 1, 2022

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This summary is machine-generated.

A new capillary microfluidic method enables controlled radical polymerization for creating gradient and patterned polymer brushes on surfaces. This technique allows for precise control over polymer thickness and grafting, with potential applications in studying interfacial properties.

Area of Science:

Polymer Chemistry
Materials Science
Surface Science

Background:

Controlled radical polymerization techniques are crucial for designing advanced materials.
Surface modification with polymer brushes allows for tailored material properties.
Existing methods for creating patterned polymer brushes can be complex and time-consuming.

Purpose of the Study:

To develop a facile and universal method for surface structuring using controlled radical polymerization.
To achieve gradient and patterned polymer brush formation with high precision.
To enable the simultaneous growth of binary polymer brushes for interfacial studies.

Main Methods:

Utilized a capillary microfluidic system employing a syringe pump and filter paper for reaction solution delivery.

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Developed a sandwich-shaped setup with a copper plate on an initiator-modified substrate.

Employed atom transfer radical polymerization (ATRP) for controlled polymer growth.

Main Results:

Successfully demonstrated oxygen-tolerant, controlled radical polymerization for surface structuring.
Achieved gradient polymer brush formation with controllable thickness, steepness, and grafting area.
Obtained polymers with high chain-end fidelity and demonstrated simultaneous growth of binary polymer brushes.

Conclusions:

The reported capillary microfluidic method offers a versatile approach for creating complex polymer brush architectures.
This technique provides precise control over surface functionalization, enabling the study of interfacial phenomena.
The method's simplicity and efficiency make it suitable for various surface engineering applications.