피마자유를 사용한 수분산 폴리우레탄 에어로겔의 제조 및 압력 센서로의 활용

초록

Polyurethane (PU) stands out as a commercially significant polymer due to its ability to control the various physical and chemical properties and thus its wide range of applications. Recent research has been actively exploring the use of eco-friendly, renewable precursors to replace traditional petroleum-based materials. In this study, an ecofriendly waterborne polyurethane (WPU)-based on aerogels were prepared using castor oil, one of the vegetable oils, as the basic raw material, and water as the main solvent. A stable porous aerogel with a low density of about 0.05 g cm-3 and a thermal decomposition temperature of 223.5 °C was produced using the freeze-drying method. They showed a compression modulus of 0.0231 to 0.547 MPa depending on the ratio of castor oil. Combined with carbon nanotubes (CNT), WPU aerogels exhibited the performance of a pressure sensor with a high sensitivity of 744.53 MPa-1 and a work range of up to 103.3 kPa, demonstrating that they can be used as a high-performance pressure sensor for wearable devices.

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