Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 33, Issue 4, Pages 1180-1189Publisher
WILEY
DOI: 10.1002/pat.5591
Keywords
high elongation; nanosheet; polydimethylsiloxane; sensor; wearable
Categories
Funding
- Asahi FR RD Co., Ltd.
- Asahi Rubber Inc.
- Waseda University Project Research Institutes [20P15]
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PDMS is a biocompatible polymer with high flexibility and heat resistance. In this study, free-standing PDMS nanosheets were fabricated and characterized, showing high mechanical properties and adhesion strength. These PDMS nanosheets can be used as a substrate for skin-contact strain sensors.
Polydimethylsiloxane (PDMS) is a biocompatible polymer that exhibits high flexibility and heat resistance. PDMS can be rapidly cross-linked at low temperatures by a platinum-catalyzed addition reaction and is used to create nanostructures owing to its high formability. In this study, free-standing PDMS thin films (PDMS nanosheets) were fabricated and characterized. PDMS nanosheets, about 90-2500 nm thick, were prepared using a microgravure coater. The mechanical properties of the PDMS nanosheets depended on the amount of cross-linker added in preparation. For example, a 93-nm-thick PDMS nanosheet showed high flexibility with elongation at break of 338% and Young's modulus of 0.46 MPa. The adhesion strength of the PDMS nanosheets was also dependent on the amount of cross-linker, and the lesser the cross-linker, the higher the adhesion strength. The PDMS nanosheets showed no change in physical properties when annealed at 150 degrees C. Flexible, adhesive, and heat-resistant PDMS nanosheets were demonstrated as a substrate for skin-contact strain sensors and showed resistance changes of 20%-30% in response to skin stretching.
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