Synthesis and characterization of thermally stable acrylic PSA using silicone urethane methacrylate with a semi-IPN structure

AbstractTo improve the thermal properties of acrylic PSA, silicone urethane methacrylate (SiUMA) is applied to acrylic PSA using a semi-interpenetrating polymer network (IPN) structure. Acrylic PSA was prepared by free radical polymerization and SiUMA was synthesized by additional polymerization via urethane linkage. By preparing synthetic SiUMA formed in a semi-IPN structure in acrylic PSA, the thermal stability can be verified with the shear adhesion failure temperature using 1 kg plumb weight. Normally, acrylic PSA can easily be cleared from the substrate at less than 50° C; but when using SiUMA at 10%, it can be resistant up to 100 C. When measuring the photo-DSC value, a 5.0 phr photoinitiator and UV intensity of 1000 mJ/cm2 can be used to complete the curing reaction. Two types of chain polymers – short and long chain polymers – were synthesized, and the structure was confirmed through FT-IR and gel permeation chromatography. By measuring the Thermogravimetric analyses, the cross-linking effect and improvement of the thermal resistance can be checked using silicone materials. With advanced rheometric expansion system, the thermal property changes and viscoelastic changes were detected. In this study, the mobility of silicone is detected while moving onto an air interface. The result of this study can provide information with which to improve the thermal stability when using SiUMA with a semi-IPN structure and acrylic PSA.Keywords: acrylic PSAsemi-IPNthermal stabilitysiliconeurethane acrylate AcknowledgmentsThis research entitled ‘MCP core technologies for the advanced semiconductor device’ was financially supported by the Korea Research Council for Industrial Science & Technology