Preparation of a MOF flame retardant containing phosphazene ring and its effect on the flame retardant of epoxy resin

IF 5.4 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2023-10-01 Epub Date: 2023-07-16 DOI:10.1016/j.reactfunctpolym.2023.105670

Ge Zhang , Yanli Dong , Meng Yao , Yumeng Cui , Weihua Meng , Shanshan Wang , Hongqiang Qu , Jianzhong Xu

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Abstract

With the aim of effectively improve the flame retardant and smoke suppression performance of epoxy resin (EP), a novel metal-organic framework (Zn-MOF) containing phosphazene ring and Zn²⁺ was synthesized by solicitation method. The results showed that adding 9 wt% solvent removed Zn-MOF (SR-Zn-MOF) could reduce the peak heat release rate (PHRR), the peak smoke production rate (PSPR), the peak of CO production (PCOP) and CO₂ production (CO₂P) of epoxy resin composites by 58.9, 45.8, 48.6, and 51.9%, respectively. Based on the analysis of the pyrolysis process of Zn-MOF and the study of the condensed phase char residues, it is found that the organic ligands containing phosphazene ring in Zn-MOF are thermally decomposed in the condensed phase to form the containing phosphoric acid and pyrophosphate substances, which together with the generated ZnO can effectively promote the carbonization of EP matrix. At the same time, the organic ligands will pyrolysis generate a large number of non-flammable gases such as NH₃ and CO₂, which can promote the intumescent of the char layer, and effectively dilute the concentration of combustible fuel and O₂ in the gas phase. Therefore, Zn-MOF have excellent flame retardant and smoke suppression effect on EP.

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含磷腈环MOF阻燃剂的制备及其对环氧树脂阻燃性能的影响

为了有效提高环氧树脂（EP）的阻燃抑烟性能，采用诱导法合成了一种新型的含磷腈环和Zn2+的金属有机骨架（Zn-MOF）。结果表明，添加9wt%的溶剂去除Zn-MOF（SR-Zn-MOF）可使环氧树脂复合材料的峰值放热率（PHRR）、峰值产烟率（PSPR）、CO生成峰值（PCOP）和CO2生成峰值（CO2P）分别降低58.9%、45.8%、48.6%和51.9%。通过对Zn-MOF热解过程的分析和对凝聚相残炭的研究，发现Zn-MOF中含有磷腈环的有机配体在凝聚相中发生热分解，形成含有磷酸和焦磷酸盐的物质，与生成的ZnO一起可以有效地促进EP基体的碳化。同时，有机配体会热解产生大量的NH3和CO2等不可燃气体，可以促进焦层的膨胀，有效稀释气相中可燃燃料和O2的浓度。因此，Zn-MOF对EP具有优异的阻燃抑烟效果。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.