Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments

Area of Science:

• Materials Science
• Polymer Chemistry
• Microfabrication

Background:

• Polydimethylsiloxane (PDMS) is a widely used silicone polymer.
• Traditional methods struggle to form PDMS into long filaments due to its material properties at melting temperatures.

Purpose of the Study:

• To develop an improved method for producing long filaments of PDMS.
• To overcome the limitations of traditional filament spinning for PDMS.

Main Methods:

• Utilized a stepped temperature profile during PDMS cross-linking from fluid to elastomer.
• Monitored warm-temperature viscosity to identify optimal drawing conditions.
• Employed a high-temperature tube oven for filament curing and harvesting.

Main Results:

• Successfully produced PDMS filaments with diameters in the hundreds of micrometers and lengths of tens of centimeters.
• Demonstrated the potential for even longer and thinner filament production.
• Filaments retained key PDMS properties, including switchable hydrophobicity, and were successfully patterned using corona discharge.

Conclusions:

• The developed method enables the production of long PDMS filaments.
• These filaments are suitable for applications such as silicone weavings, gas-permeable sensor components, and microscale foldamer models.