Session 20: Next Gen Advancements
PDMS films for printed electronics - Methods and Advancements
Thursday, February 15, 2018
2:00 PM - 2:25 PM
Polydimethysiloxane (PDMS) is an attractive material for printed electronics. It is a soft, water impermeable dielectric and a familiar material for encapsulating and protecting electronics. In addition, PDMS is an ideal material for medical applications given its biocompatibility, chemically inertness and high oxygen permeability. However, PDMS has not gained mainstream adoption in printed electronics due to a number of challenges. A major obstacle is its inherently low surface energy. At <20 dynes, it is significantly more difficult for common inks on the market to wet and adhere to it compared to traditionally used TPUs. In addition, residual PDMS is known to bloom to the substrate surface. This residue is a known contaminant that prevents adhesion of not only conductive inks but also the adhesives used to bond devices to its surface. Delphon offers several advanced substrate options for printed electronics such as PDMS, low hysteresis TPUs and thermoset urethanes. In addition Delphon provides COPE films for high temperature applications. This presentation will focus on the advancements and methods developed at Delphon to provide unique printable PDMS films. Delphon’s ultra-soft variety of silcones can offer durometers down to 6 Shore A. The described proprietary PDMS material and film constructions can withstand temperatures down to -50○C and up to 200○C allowing for more ink compatibility. The materials are durable with hysteresis <1%. Furthermore, the material has no detectable residue via QCMD thus allowing for better ink and device adhesion.
PDMS is an attractive material for printed electronics
• High oxygen permeability
• Chemically inert
• Good encapsulant, impermeable to water
PDMS has its issues
• Low surface energy – (Dynes compared to TPUs)
• Residue – prevent attachment to devices
• Tacky, Not lubricious, High coefficient of friction???
• Ultra-soft with a variety of durometers
• Low/no hysteresis
• No residue
• Temperature stable at low and high temperatures compared to TPU
Victoria joined Delphon in 2017. She is responsible for directing the Research and Development team consisting of chemistry, engineering and quality control. Victoria leads the scoping and development for innovative product and materials solutions for new customer applications. In addition she and her team develop methods and processes for in-line manufacturing innovations for cost savings and product improvement. Prior to Delphon, Victoria was a Senior Scientist at CooperVision. There, she led cross functional research and development teams to develop new materials and coatings for novel contact lenses. Her work there has resulted in more than six patent applications. Victoria is a Chemical Engineer with a PhD from UC Berkeley and a BS from UMass Lowell. She also holds a number of certificates including Management of Technology from UC Berkeley and Program Management from CalTech. In addition she is trained as a Six Sigma Greenbelt and in statistical Process Controls.