Bimetallic organic framework-derived nanocages loaded with phosphorus-containing compound for flame-retardant epoxy composites

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-04-05 DOI:10.1016/j.clay.2025.107810

Liang Yue, Shuxian Zheng, Shuyang Shi, Wenhui Rao, Chuanbai Yu

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引用次数: 0

Abstract

Small-molecule phosphorus-containing flame retardants typically exhibit low thermal stability and are prone to precipitate in polymers. In this study, cobalt‑nickel layered double hydroxide (CoNi-LDH) with a hollow mesoporous structure was synthesized using ZIF-67 (zeolitic imidazolate framework) as a self-template. Subsequently, dimethyl methylphosphonate (DMMP)-loaded CoNi-LDH (P@CoNi-LDH) was prepared, utilizing DMMP (as a small molecule of phosphorus-containing flame retardant) as a guest component and immobilizing DMMP in its channels and cavities. This innovative loading structure addresses the limitations of small molecule flame retardants, and the synergistic use of two different types of flame retardants achieves satisfactory flame retardancy. The conclusions indicated that the epoxy (EP) composites blended with 5 wt% P@CoNi-LDH (sample EP-5 %P@CoNi-LDH) received a vertical burning V-1 rating and a limiting oxygen index (LOI) value of 31.2 %. The peak heat release rate, peak smoke production rate, and peak production rate of toxic gas carbon monoxide in EP-5 %P@CoNi-LDH were reduced by 43.9 %, 31.1 %, and 46.5 %, respectively, compared to pure EP. Moreover, the hollow mesoporous structure of CoNi-LDH enhanced the interfacial interaction with EP, positively influencing various mechanical properties and thermal stability. Specifically, the impact strength and flexural strength of EP-1 %P@CoNi-LDH increased by 54.8 % and 21.4 %, respectively. This work presents a feasible method for the synthesis of flame retardant carriers with hollow mesoporous structures generated from bimetallic-organic frameworks.

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含磷化合物的双金属有机框架衍生纳米笼用于阻燃环氧树脂复合材料

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...