Journal
POLYMER
Volume 240, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2021.124490
Keywords
Vapor phase polymerization; Thermoplastic polyurethane; 3D printing; Ammonia gas sensor; Strain sensor; Conductive composites; Polypyrrole
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1I1A3A01054826]
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Fabrication methods for 3D soft and flexible gas/strain sensing materials were investigated in this study. Electrically modifying 3D-printed soft thermoplastic polyurethane (TPU) with polypyrrole (PPy) led to excellent electrical strain sensing behavior and stability. The modified TPU also showed great potential as an ammonia gas sensor.
Fabrication methods for 3D soft and flexible gas/strain sensing materials are of great interest in various sensing fields. This study investigated electrically modifying 3D-printed soft thermoplastic polyurethane (TPU) as an ammonia gas/strain sensing material due to its tunable mechanical and stretchable properties and ease of fabrication. 3D-printed soft TPU were electrically modified with polypyrrole (PPy) using a sequential procedure of vapor phase polymerization (VPP). VPP can make two-phase composites with a high degree of homogeneity. PPy polymerized via VPP was distributed into a TPU matrix. Tunable mechanical properties were realized by changing the infill density (porosity) of 3D printed TPU. Moreover, TPU-PPy composites showed excellent electrical strain sensing behavior, stability, and durability during 5000 bending/releasing cycle loading. TPU-PPy composites were further evaluated for selectivity and sensitivity to investigate gas sensing behavior towards other reducing gases such as ammonia, triethylamine, ethanol, and methanol. 3D-printed and electrically modified soft TPU showed great potential as an ammonia gas sensor and as a strain sensing material with high performance.
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