Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 5, Pages 6479-6488Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20631
Keywords
3D printing; digital light processing; polyurethane elastomers; high strength; stretchable electronic sensor
Funding
- State's Key Project of Research and Development Plan [2016YFB1100900]
- China Postdoctoral Science Foundation [2019M662256]
- Jiangxi Provincial key Research and Development Program [20192ACB80002]
- Regional Key Program of Science and Technology Service Network Initiative from Chinese Academy of Sciences [KFJ-STS-QYZX-023]
- Fund of National Engineering and Research Center for Commercial Aircraft Manufacturing
- STS Project of Fujian-CAS [2019T3013, 2019T3016, 2019T3018]
- Fund of National Engineering Research Center for Optoelectronic Crystalline Materials
- Open Project Program of Fujian Universities and Colleges Engineering Research Center of Soft Plastic Packaging Technology for Food
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Advanced stretchable electronic sensors with a complex structure place higher requirements on the mechanical properties and manufacturing process of the stretchable substrate materials. Herein, three kinds of polyurethane acrylate oligomers were synthesized successfully and mixed with a commercial acrylate monomer (isobornyl acrylate) to prepare photocurable resins with a low viscosity for a digital light processing three-dimensional (3D) printer without custom equipment. Results showed that the resin containing poly(tetrahydrofuran) units (PPTMGA-40) exhibited optimal mechanical properties and shape recoverability. The tensile strength and elongation at break of PPTMGA-40 were 15.7 MPa and 414.3%, respectively. The unprecedented fatigue resistance of PPTMGA-40 allowed it to withstand 100 compression cycles at 80% strain without fracture. The transmittance of PPTMGA-40 reached 89.4% at 550 nm, showing high transparency. An ionic hydrogel was coated on the surface of 3D-printed structures to fabricate stretchable sensors, and their conductivity, transparency, and mechanical performance were characterized. A robust piezoresistive strain sensor with a high strength (similar to 6 MPa) and a wearable finger guard sensor were fabricated, demonstrating that this hydrogel-elastomer system can meet the requirements of applications for advanced stretchable electronic sensors and expand the usage scope.
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