2 research outputs found
Thermal Transition Behavior, Thermal Stability, and Flame Retardancy of Low-Melting-Temperature Copolyester: Comonomer Effect
Phosphorus-containing
poly(ethylene terephthalate-<i>co</i>-diethylene terephthalate)
(PEDT) with a low melting temperature
was synthesized through esterification and copolycondensation of terephthalic
acid, ethylene glycol, diethylene glycol (DEG), and 3-(hydroxyphenylphosphinyl)propionic
acid (HPPPA). DSC results showed that PEDTs still were crystallizable
and that the lowest melting temperature of the PEDTs was reduced to
118.0 °C although the chain regularity was destroyed by the incorporation
of comonomers. It was found that the addition of HPPPA can improve
the thermal oxidative stability of copolyesters. The results of the
limiting oxygen index (LOI) test, the UL-94 vertical test, and the
cone calorimeter test indicated that HPPPA endowed PEDT with good
flame-retardant properties. The LOI values of the PEDTs were increased
to 30.5–34.8, the UL-94 ratings of vertical burning were improved
to V-0, and both the peak heat release rate (pHRR) and the total heat
release (THR) obviously decreased
A Sandcastle-Worm-Inspired Strategy toward Antimicrobial Fouling and Fireproof Composite
Marine composites with antimicrobial
fouling and fireproofing
are
indispensable for ocean facilities that resist extremely harsh environments.
Marine life has excited various inspirations to withstand harsh environments,
in which sandcastle worms secrete unique adhesives for gluing sand
and shell fragments together to build robust and protective habitats.
Herein, we design an adherable macromolecule interface containing
tyramine and ammonium phosphate motifs to create superhighly flame-retardant
and excellent antibacterial functional composites. The results demonstrate
that the phenolic hydroxyl groups in tyramine improve the chemical
affinity among ammonium polyphosphate, vinyl ester resin, and carbon
fibers due to the great adhesion, while also exhibiting excellent
broad-spectrum antimicrobial fouling properties for bacteria, mold,
and algae. The tyramine and ammonium phosphate groups synergistically
achieve superhigh fire-safety performance beyond current levels to
powerfully defend human life in maritime confined spaces. This sandcastle-worm-inspired
strategy emerges as an attractive candidate for super antimicrobial
fouling and fireproof protection in extremely harsh ocean environments