Abstract
Thermoplastic elastomers and polycarbonates offer an interesting combination of rigid and soft materials for housings and interfaces in wearable applications. This study examines adhesion and chemical resistance for medical-grade resins that are candidates for wearable applications. Peel strength measurements overmolded test pieces of Makrolon®, Bayblend® and Makroblend® alloys showed strong adhesion to various grades of Medalist® TPE. All specimens showed cohesive failures during peel tests. Slightly higher peel strengths were obtained for direct 2-shot overmolding than with insert molding. Chemical resistance tests for these materials against suntan lotion and isopropyl alcohol suggest that Medalist MD-36975 and Makrolon 2458 are excellent choices of candidate materials for wearable devices.
Bayblend®, Makroblend® and Makrolon® are registered trademarks of the Covestro Group
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