2D mesh-knots metal organic frameworks functionalized with phytic acid for improving flame retardancy

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-09-13 DOI:10.1016/j.molstruc.2024.140067

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Abstract

Metal ions and organic compounds were adopted to form a two-dimensional mesh-knots metal organic frameworks (TMMOFs), which could functionalize with Phytic Acid (PA) for fireproof. The results of the functional group test show that two-dimensional mesh-knots metal organic frameworks (TM), TM with -NH₂ (TMN) and TMN with PA (TMNP) have been successfully prepared by coordination bond. The samples appeared irregular ellipsoid with size of particles below 100 nm. The values of limiting oxygen index (LOI) test depicted the flame resistance have been enhanced from 22.7 % to 30 % due to the addition of -NH₂ and PA. The peak heat release rate (pHRR) and total heat release (THR) value of TM-PA@wood declined noticeably by 55.9 % and 68.6 % compared to pure wood. CO₂ emissions intensity of TMNP@wood declined from about 0.40 to 0.12 compared with samples without PA. The CO₂ and CO maximum production of TMNP@wood were significantly lower 246% and 64% than TMN@wood, respectively. PA and ZrO₂ after combustion could catalyze wood to form carbon residue as condense phase, delay and minimize the peak of CO₂ and CO to reduce toxicity. This work provides an effective strategy for synthesis and application of two-dimensional materials in flame retardant field.

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采用金属离子和有机化合物形成了二维网结金属有机框架（TMMOFs），该框架可与植酸（PA）功能化以达到防火目的。官能团测试结果表明，通过配位键成功制备了二维网结金属有机框架（TM）、含-NH2的TM（TMN）和含PA的TMN（TMNP）。样品呈不规则椭圆形，颗粒大小在 100 nm 以下。极限氧指数（LOI）测试值表明，由于添加了 -NH2 和 PA，阻燃性能从 22.7% 提高到了 30%。与纯木材相比，TM-PA@木材的峰值热释放率（pHRR）和总热释放率（THR）值明显下降了 55.9% 和 68.6%。与不含 PA 的样品相比，TMNP@木材的二氧化碳排放强度从约 0.40 降至 0.12。与 TMN@木材相比，TMNP@木材的二氧化碳和一氧化碳最大产生量分别显著降低了 246% 和 64%。燃烧后的 PA 和 ZrO2 可催化木材形成残碳冷凝相，延缓并降低 CO2 和 CO 的峰值，从而降低毒性。这项工作为二维材料在阻燃领域的合成和应用提供了有效的策略。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.

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