20.500.12556/RUL-137734 In situ prepared polyamide 6/DOPO-derivative nanocomposite for melt-spinning of flame retardant textile filaments A novel flame retardant polyamide 6 (PA6)/bridged 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-derivative (PHED) nanocomposite textile filament yarns were developed. The scalable production approach includes in situ water-catalyzed ring-opening polymerization of ε-caprolactam in the presence of the flame retardant PHED followed by melt-spinning of nanocomposite filament yarns and production of knitted fabrics. The specific chemical structure of the PHED additive enabled its excellent miscibility with molten ε-caprolactam and the uninterrupted polymerization of ε-caprolactam. The produced PA6/PHED nanocomposite was characterized by the preserved molecular structure of the polyamide 6 and uniformly distributed nano-dispersed FR at concentrations of 10 and 15 wt %. The PA6/ PHED nanocomposite structure was successfully preserved after the melt-spinning processing. The PA6 nanocomposite filament yarns at the applied 15 wt %. loading of PHED showed (a) increased thermooxidative stability compared to neat PA6 up to 500 °C, with a 43% higher residue at 500 °C and (b) self-extinguishment of fiber strand and knitted samples within 1 s in standard vertical flame spread tests (ASTM D6413), followed by the significant reduction of the melt-dripping and the melt-drop flammability. Additionally, 1.2 mm-tick PA6/PHED bar samples achieved a V0 rating in UL94 vertical burning test at the applied 10 wt % concentration of PHED. This innovative and scalable approach could pave the way for the production of new-generation nanocomposite PA6 filament yarns with self-extinguishing properties at the macro-scale, which would be highly beneficial for increasing fire safety, whilst maintaining the use of a DOPO derivative at the minimum level. polyamide 6 DOPO derivative flame retardant in situ polymerization melt-spinning nanocomposite filament yarns poliamid 6 DOPO derivati ognjevarno sredstvo in situ polimerizacija predenje nanokompozitna filamentna preja true false true Angleški jezik Slovenski jezik Članek v reviji 2022-06-29 15:26:12 2022-06-29 15:26:13 2022-09-15 04:15:44 0000-00-00 00:00:00 2019 0 0 Str. 50-59 Vol. 166 2019 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 677 0141-3910 10.1016/j.polymdegradstab.2019.05.011 3602288 1-s2.0-S0141391019301697-main.pdf 1-s2.0-S0141391019301697-main.pdf 1 621F94E4755DAEA8D13234187E47A5B1 3a03bc0d7bbfdea402a6eeea9f088736007ab6fa2b66aefd1eae67240fd289c7 5761f66a-f7af-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157794 https://www.sciencedirect.com/science/article/pii/S0141391019301697 1 d7fddbbd-f7ae-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157793 Naravoslovnotehniška fakulteta 0 0 0