A polyurethane (PU) composite nanofiber with superior flame retardancy and antimicrobial property is developed through the simultaneous incorporation of boron-doped carbon nanotubes (CNTs) and tannic acid (TA), resulting in excellent thermal, mechanical, and eco-friendly flame-retardant properties. The tensile strength and peak heat-release rate of the composite nanofiber increase with increasing filler content, with the optimal performance (7.38 ± 1.04 MPa and 254 W g−1) being achieved at 3 wt% filler. Using a series of analytical techniques, it is demonstrated that the nanostructure of the neat PU completely collapses upon heating, transforming into a film-like structure; in contrast, a higher loading of nanofiller leads to a higher heat-shielding capability, thereby facilitating preservation of the composite nanofiber structure. Finally, the antibacterial activity is shown to increase as a result of the synergic effect of the boron-doped CNTs and TA.
Bibliographical noteFunding Information:
Y.N.K. and J.Y.J. contributed equally to this work. This work was supported by the Korea Institute of Science and Technology (KIST) Institutional Program (2Z06543, 2N62650). This research was financially supported by Korea Institute of Civil Engineering and Building Technology (KICT), projecct No. 20210293‐001 and National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2021M3H4A1A03041296). The authors would like to thank Dr. Yong‐Tae Kim, CEO (BIOVIT Co., Republic of Korea) for providing the antimicrobial tests and guidance.
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry