Carbon Dots as smoke suppression agents for the reduction of CO release in combustion and improvement of UV resistance towards Phosphorus-containing polyester

A Machine‐Braided Flame‐Retardant Triboelectric Yarn/Textile for Fireproof Application

“…It should be attributed to the introduced CEPPA monomers in PET (see Figure S6, Supporting Information), which enhances the molecular chain movement and polarization ability of PET macromolecular chains, thus resulting in the higher triboelectric capability of FRT‐TENG. [ 41,51 ] Furthermore, when FR‐PET yarns are used as the sheath layer, the obtained T‐TENG presents excellent flame retardancy. The horizontal vertical burning tester, oxygen index meter, and cone calorimetry were adopted to systematically evaluate the flame retardancy of the FRT‐TENG, and the test results are shown in Figure .…”

“…This should be mainly caused by the radical inhibitors (PO• and PO 2 •) generated by CEPPA in the early stages of combustion, which interrupt the complete combustion of PET and the formation of a large amount of smoke. [ 41,56 ] In addition, the gas released by FRT‐TENG during its combustion was analyzed by 3D TG‐IR spectra (see Figure S10, Supporting Information), which includes water vapor (3500–4000 cm −1 ), CO 2 (2300–2400 cm −1 ), and CO (2100–2200 cm −1 ). [ 33 ]…”

“…During the combustion, the CEPPA component in the FR-PET sheath layer catalyzes the formation of the thermally stable char upon ignition, preventing the transfer of heat and oxygen. [41,55] Speaking of the smoke released condition during combustion, the FRT-TENG presents a higher total smoke production (TSP) than the FT-TENG (see Figure S9, Supporting Information). This should be mainly caused by the radical inhibitors (PO• and PO 2 •) generated by CEPPA in the early stages of combustion, which interrupt the complete combustion of PET and the formation of a large amount of smoke.…”

“…This should be mainly caused by the radical inhibitors (PO• and PO 2 •) generated by CEPPA in the early stages of combustion, which interrupt the complete combustion of PET and the formation of a large amount of smoke. [41,56] In addition, the gas released by FRT-TENG during its combustion was analyzed by 3D TG-IR spectra (see Figure S10, Supporting Information), which includes water vapor (3500-4000 cm −1 ), CO 2 (2300-2400 cm −1 ), and CO (2100-2200 cm −1 ). [33] In summary, thanks to the high triboelectric polarization and flame retardancy of the formed FR-PET sheath layer, which is tightly covering the conductive core fiber, the FRT-TENG fabricated by high-speed braiding technology simultaneously presents high energy output performance and flame-retardant properties (see Table S1, Supporting Information), thus presenting great application potential in the extreme environments such as oil drilling industry, military personnel, and firefighters.…”

“…[39,40] In our previous studies, PET filaments with inherent flame-retardant properties (abbreviated as FR-PET yarns in the following text) were fabricated by introducing the reactive-type flame retardant 2carboxyethyl(phenyl) phosphinic acid (CEPPA) into PET molecular chains, followed by melt spinning process. [33,41] In this study, we fabricated a flame-retardant Y-TENG (FRY-TENG) by braiding technology, during which the FR-PET was used to form the external friction layer, and then weaved the obtained yarns into an FRT-TENG. We aim to develop a simple and high-speed fabrication process for the FRT-TENGs with extinguished comprehensive properties including good energy harvesting ability, excellent flame retardancy, and high comfortability, making it a perfect candidate for intelligent protective devices, including the smart firefighter uniform and the intelligent carpet for escape direction indication.…”