A Universal Strategy for Growing a Tenacious Hydrogel Coating from a Sticky Initiation Layer.

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Engineering

Background:

• Controllable hydrogel coatings on surfaces are crucial for medical devices but lack universal application techniques.
• Existing methods often struggle with diverse substrate materials and complex geometries.

Purpose of the Study:

• To develop a universal method for creating hydrogel coatings on various substrates and medical devices.
• To enable controllable hydrogel coating thickness, composition, and surface properties.

Main Methods:

• A novel ultraviolet-triggered surface catalytically initiated radical polymerization (UV-SCIRP) method using a sticky initiation layer (SIL) was developed.
• The process involves depositing a polydopamine/Fe3+ SIL, UV-triggered reduction of Fe3+ to Fe2+ catalyst with citric acid, and subsequent SCIRP in monomer solution.
• This SIL@UV-SCIRP technique is applicable to a wide range of natural and artificial materials.

Main Results:

• Hydrogel coatings with controllable thickness and diverse compositions were successfully grown on various substrates.
• The hydrogel coatings demonstrated strong interface bonding and tunable wettability and lubrication properties.
• Uniform hydrogel lubrication coatings were achieved on complex-geometry medical devices, validated by smooth movement of coated objects in simulated environments.

Conclusions:

• The SIL@UV-SCIRP method provides a pioneering, universal tool for surface and interface modification with hydrogels.
• This technique significantly enhances the performance of medical devices through improved lubrication and surface properties.
• The method holds broad potential for applications in materials science, engineering, and biomedical fields.