Off-Stoichiometry Thiol-Enes Polymers Containing Silane Groups for Advanced Packaging Technologies

Area of Science:

• Polymer Chemistry
• Materials Science
• Microfluidics

Background:

• Off-stoichiometry thiol-ene (OSTE) polymers are versatile materials for microfabrication.
• Direct bonding of polymers to silicon wafers typically requires surface modification or adhesives.

Purpose of the Study:

• To develop a novel OSTE polymer (OSTE-MS) functionalized with silane groups for direct adhesion to silicon wafers.
• To optimize the composition of OSTE-MS for 3D microfabrication on silicon chips.
• To characterize the material properties of the developed OSTE-MS polymer.

Main Methods:

• Introduction of mercaptosilane into the OSTE polymer mixture.
• Determination of the optimal monomer ratio (6:6:1 allyl monomer:mercapto monomer:mercaptosilane).
• Comprehensive material characterization including mechanical, thermal, optical, and chemical resistance tests.

Main Results:

• OSTE-MS polymers exhibit inherent adhesion to silicon wafers without surface pre-treatment.
• The optimal composition allows for the fabrication of stable 3D polymer structures.
• Characterization confirmed desirable properties such as hardness, tensile strength, optical transparency, and thermal stability.

Conclusions:

• The developed OSTE-MS polymers offer a facile method for fabricating 3D structures and microfluidic devices directly on silicon.
• The silane functionalization eliminates the need for adhesives, simplifying device fabrication processes.
• OSTE-MS polymers represent a promising material for advanced micro- and nanofluidic applications.