Abstract

This paper reports the use of rubber—Polybutadiene as an intermediate adhesive layer for improving the adhesion between polyimide (PI) and silicone polydimethylsiloxane (PDMS) which is required for a reliable fabrication of flexible/stretchable body patches for various applications. The adhesive bond initiated by the butyl rubber (BR), apart from being extremely strong, is also chemically resistant and mechanically stable as compared to the state of the art processes of improving adhesion between PI and Silicone.

Highlights

  • Medical interventions in new technology is making way for novel ideas

  • The materials to be used in the fabrication of such devices have to be themselves flexible, and in some cases stretchable in nature

  • The fabrication of the patch has a set of requirements of which adhesion between the flexible and stretchable layers being used, PI and PDMS respectively, is the most important one

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Summary

Introduction

Medical interventions in new technology is making way for novel ideas. One of them is to incorporate ultrasound transducers on a large flexible and stretchable body patch for on-body applications such as therapy, monitoring etc. The materials to be used in the fabrication of such devices have to be themselves flexible, and in some cases stretchable in nature These materials in this paper are a stack of polyimides and silicones (PI 2611 and PDMS, Sylgard). One of the mechanisms reported in the literature to enhance the bonding properties of PDMS to PI is by exposing it to a short oxygen plasma which makes the surface active, and more chemically reactive to the polyimide surface [3]. This only holds for cases where pre-cured PDMS is bonded to cured PI. Another aspect of its property is presented which has not been previously reported

Wafer Preparation
Butyl Rubber Preparation
Peel Measurements
Results and Discussion
Diffusive Bonding

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