Wei Tan,Yin Tian,Lei Tan,Lu Bai,Ying Chang,Guixiang Song,Yuanlin Ren,Ping Li,Xiaohui Liu
Addressing the dual challenges of diminishing fossil reserves and proliferating plastic waste accumulation, harnessing renewable cellulose resources offers a promising solution. Guided by the principles of intumescent flame retardant system, the eco-friendly hyperbranched phosphonitrile networks integrating acid, carbon and gas sources was prepared and covalently anchored onto Lyocell fabrics. Further, the hyperbranched phosphonitrile networks induced the interfacial assembly of zirconium phosphate (ZrP) to construct flame retardant Lyocell fabrics (Lyocell-TCHNs@ZrP) with low-temperature multiphase catalytic carbonization and high-temperature physical shielding effects. The char residue of Lyocell-TCHNs@ZrP under N 2 atmosphere was increased from 13.63 % of original sample to 39.12 % at 800 °C, while the thermo-oxidative behavior was also suppressed in air conditions. Meanwhile, the peak heat release rate (PHRR) and total heat release (THR) of Lyocell-TCHNs@ZrP were reduced by 66.10 % and 80.90 %, which showed great self-extinguishing ability in combustion test. In addition, the tensile strength of Lyocell-TCHNs@ZrP was slightly improved, while the hand feel and whiteness were well remained. This work provided fundamental insights into the molecular design of hyperbranched intumescent flame retardants and the synergistic interaction between solid catalysts, along with an effective strategy for the fire safety performance of cellulose derived textiles.
High-performance and multifunctional epoxy resins (EP) hold significant promise for diverse applications, yet grappling with the flammability, low thermal stability and mechanical property. In this work, a hierarchical core–shell-dot nanostructure (PDH@β-CD-AA-Fe) was designed via the in-situ polymerization of dopamine hydrochloride (DOPA) on the surface of halloysite nanotube (HNT), then hybriding with aminobenzeneboronic acid (AA), cyclodextrins (β-CD) and transition metal iron ions (Fe). Only 2.5 wt% PDH@β-CD-AA-Fe imparted EP with UL-94 V-0 level at a LOI of 29.3 %, a 52.8 % decreased of peak heat release rate (pHRR), accompanied by a higher proportion of graphitized char layer via the interface-catalyzed charring process. Remarkably, the tensile strength and flexural strength concurrently increased by 40.0 % and 24.9 % comparing to that of neat EP, respectively. Furthermore, a significant reduction in temperature directly above the standard room’s ceiling within 500 s of ignition, accompanied by substantial decreases in CO concentration and smoke emission according to the Fire Dynamics Simulator. Prospectively, the rational strategy of constructing an interface catalysis charring and active organic surface of HNT exploits a highly efficient strategy for developing high-performance EP.
危险品化学品经营许可证（带存储）