Multi-layer PDMS films having antifouling property for biomedical applications.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surface Engineering

Background:

• Poly(dimethylsiloxane) (PDMS) is widely used for implantable biomedical micro-device packaging due to its favorable properties.
• However, PDMS's high permeability to gases and hydrophobic nature present challenges, including defect-induced penetration and cell fouling.
• These limitations hinder the practical application of PDMS-based devices.

Purpose of the Study:

• To enhance the barrier performance and biocompatibility of PDMS packaging layers.
• To address defect-induced penetration and hydrophobicity-related fouling issues in PDMS.
• To develop a method for creating improved PDMS packaging for biomedical micro-devices.

Main Methods:

• Fabrication of roller-casted multiple thin PDMS layers to minimize defects.
• Surface-initiated atom transfer radical polymerization (SI-ATRP) to graft poly(oligo(ethylene glycol) methacrylate) (POEGMA) brushes.
• Characterization using static water contact angle, X-ray photoelectron spectroscopy, and ATR-FTIR; in vitro cell behavior evaluation.

Main Results:

• Roller-casted multiple thin PDMS layers effectively minimized defect-induced penetration.
• Grafting POEGMA brushes conferred hydrophilicity to the PDMS surface.
• The modified PDMS substrates demonstrated significant resistance to cell fouling in vitro.

Conclusions:

• The developed fabrication method significantly improves PDMS thin films for biomedical device packaging.
• Surface modification with POEGMA brushes successfully addresses PDMS hydrophobicity and cell fouling.
• This approach offers a promising strategy for advanced PDMS-based biomedical micro-devices.