Skin Adhesives with Controlled Adhesion by Polymer Chain Mobility

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• Wearable devices are vital in biomedical and electronic fields, yet effective, controlled skin adhesives are often overlooked.
• Existing biomimetic adhesives face challenges in achieving non-irritant, controlled adhesion without complex surface structures.
• Developing adaptable skin adhesives is critical for the functionality and user comfort of wearable technology.

Purpose of the Study:

• To present novel skin-adhesive patches (SAPs) based on polydimethylsiloxanes with tunable adhesion properties.
• To demonstrate that controlled adhesion can be achieved by molecular-level modulation of polymer chain mobility.
• To validate the application of these SAPs in wearable devices, specifically for sensor fixation.

Main Methods:

• Synthesized polydimethylsiloxane-based skin-adhesive patches (SAPs).
• Investigated the relationship between polymer chain mobility (free, dangling, cross-linking chains) and adhesive strength.
• Integrated SAPs with a poly(vinylidene fluoride-trifluorethylene)/reduced graphene oxide (P(VDF-TrFE)@rGO) nanofiber sensor to demonstrate functionality.

Main Results:

• Controlled adhesion was achieved by modulating polymer chain mobility at the molecular level.
• Adhesion strength was found to be dependent on the proportion of polymer chains with varying mobility.
• The SAPs successfully functioned as a skin-friendly fixation for a pulse-monitoring sensor.

Conclusions:

• Polydimethylsiloxane-based skin-adhesive patches offer a method for controlled adhesion through molecular design.
• These adhesives are skin-friendly and suitable for long-term wear in biomedical applications.
• The findings provide a pathway for developing advanced, durable adhesives for wearable electronic devices.