Flame retardancy of <i>biodegradable</i> polylactic acid with piperazine pyrophosphate and melamine cyanurate as flame retardant

Zhang

et al. 2023

Environ Sci Eur

Self Cite

The objective is to achieve the goal of carbon neutrality, controlling CO2 emissions is a primary problem to be solved in the current environmental protection field. Eliminating the environmental pollution of dyes in industrial wastewater is also an urgent problem to be solved in the field of environmental protection. The adsorption technique is an effective way to deal with these two issues. Developing high-efficiency adsorbents is an essential work in the adsorption field. In this work, a simple carbonization method has been developed to prepare porous carbon. The morphology and structure of the prepared porous carbon were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and surface area measurement. By studying the influence of preparation conditions on the structure and properties of the prepared carbon materials, it was found that the carbon materials prepared at 900 ℃ (PCMCA-900) exhibited a high specific surface area of 1476 m2 g−1 and a high total pore volume of 0.951 cm3 g−1. The PCMCA-900 showed the highest CO2 uptake of 7.67 mmol g−1 at 0 ºC and the adsorption capacity of PCMCA-900 decreased by less than 5% after 10 times recycling. Moreover, when PCMCA-900 was used as an adsorbent to remove Congo red in water, an adsorption capacity of 652.3 mg g−1 was achieved. Therefore, potassium citrate-derived porous carbon is a desirable candidate for excellent CO2 adsorption and Congo red in industrial wastewater.

Section: Introductionmentioning

confidence: 99%

Potassium citrate-derived porous carbon with high CO2 capture and Congo red adsorption performance

Zhang

et al. 2023

Environ Sci Eur

Self Cite

“…The blends of LLDPE/EVA have been usually used as the matrix of cable sheathing materials due to their low cost, low density and good processability. However, flame retardants are needed to meet the requirement of tough standards because LLDPE and EVA are highly flammable, similar to epoxy resin 1,2 and polylactic acid 3 . Halogenated flame retardants usually act in the gaseous phase and release more toxic smoke, which are dangerous to human health.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of OMMT and Ni₂O₃ on the flame retardancy of LLDPE/EVA composites with magnesium hydroxide

Liu

J of Applied Polymer Sci

et al. 2023

Self Cite

Organically modified montmorillonite (OMMT) and Ni2O3 were simultaneously introduced into flame‐retardant linear low‐density polyethylene/ethylene‐vinyl acetate/magnesium hydroxide (LEM) composites. Compared with the LEM composite, the thermal stability, and tensile properties of LEM/ remained basically unchanged when 5 wt% of OMMT/Ni2O3 was substituted for MH. The LOI value increased a little from 27.2 to 27.7%. The data from cone calorimeter test showed that the first and second peak heat release rate was reduced by 19% and 67%, respectively. The total heat release and total smoke production showed a significant reduction by 18% and 36% after incorporation of OMMT/Ni2O3, respectively. The mechanism study indicated that the combination of OMMT/Ni2O3 cooperates promote the carbonization of the polymer itself into carbon naotubes, which form a more cohesive char layer with magnesium hydroxide during combustion. This is the core factor responsible for the synergistic effect on reducing the heat release and smoke production in the LEM composite.

“…Additionally, PPAP shows an excellent water resistance due to its macromolecular structure, [ 4 ] and has a wider application. PPAP can be used in polypropylene (PP), [ 5,6 ] unsaturated polyester, [ 7 ] polyamide, [ 4,8 ] acrylonitrile‐butadiene‐styrene copolymer (ABS), [ 9 ] epoxy resin [ 10 ] and polylactic acid, [ 11 ] and so on. Although PPAP has the functions of acid source, carbon source and gas source, its foaming effect, however, is obviously insufficient, so that its flame retardant effect is not very satisfactory when used alone.…”

Section: Introductionmentioning

confidence: 99%

Synergistic flame retardancy of ZnO and piperazine pyrophosphate/melamine cyanurate in polypropylene

Liu

Vinyl Additive Technology

et al. 2022

In order to improve the flame retardant efficiency and smoke-suppression of piperazine pyrophosphate/melamine cyanurate (PPAP/MCA) in PP, the synergism of ZnO and PPAP/MCA was investigated by limiting oxygen index (LOI) determination, UL-94 test, and cone calorimetry test (CCT). It is found that ZnO performs an exceptional synergism in flame retardant effect and inhibition on the flame propagation. Besides, ZnO can significantly inhibit the production of the smoke and CO. The TGA of the PP composites, the component and structure analysis of the heated composites and CCT residues reveal that ZnO performs the synergism primarily by the following modes: ZnO promotes obviously the charring of the composite, and improves the thermal stability as well as the strength of the intumescent layer, which brings about an improved flame retardant property and inhibiting ability on the flame propagation.