以dopo为基础的聚酰胺和植酸/ pei改性的CaAl LDH增强PLA的阻燃性和热稳定性：通过本体和涂层策略的协同方法

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-05 DOI:10.1016/j.porgcoat.2025.109650

Mohsen Hajibeygi, Mahdi Heydari

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引用次数: 0

摘要

为了提高聚乳酸（PLA）的阻燃性、热稳定性和力学性能，研制了一种由含dopo的聚酰胺（DPA）和植酸/聚亚胺改性CaAl层状双氢氧化物（MLDH）组成的阻燃体系。采用了两种改性策略：在PLA薄膜上直接涂覆DPA和DPA/MLDH纳米复合材料，将MLDH掺入PLA中，再涂覆DPA。两种改性均采用浸涂法在浓溶液中进行。傅里叶变换红外（FTIR）、x射线衍射（XRD）和场发射扫描电镜（FE-SEM）分析证实了MLDH的均匀分散和有效的涂层形成，这有助于改善纳米复合结构内部的界面相互作用。热重分析（TGA）表明，掺入MLDH和DPA涂层的协同作用显著提高了T10值和焦渣，表明热稳定性和成焦能力增强，抑制了火焰的传播。此外，与纯PLA相比，含有5wt % DPA （PLN5-DC）涂层MLDH的PLA样品的峰值热释放率（pHRR）降低了35%，反映出阻燃性的提高。MLDH/DPA体系提供的氧阻隔效应和炭强化提高了极限氧指数（LOI），并使UL94 V-0分级成为可能。力学测试表明，MLDH的存在显著增强了PLA基体，导致拉伸强度大幅增加（高达77.2 MPa）。

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Enhanced flame retardancy and thermal stability of PLA via DOPO-based polyamide and phytic acid/PEI-modified CaAl LDH: A synergistic approach through bulk and coating strategies

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Enhanced flame retardancy and thermal stability of PLA via DOPO-based polyamide and phytic acid/PEI-modified CaAl LDH: A synergistic approach through bulk and coating strategies

A flame-retardant system combining a DOPO-containing polyamide (DPA) and a phytic acid/polyethylene imine-modified CaAl layered double hydroxide (MLDH) was developed to enhance the flame retardancy, thermal stability, and mechanical properties of polylactic acid (PLA). Two modification strategies were employed: direct coating of PLA films with DPA and DPA/MLDH nanocomposites, and incorporation of MLDH into PLA followed by DPA coating. Both modifications were carried out using a dip-coating method in concentrated solutions. Uniform dispersion of MLDH and effective coating formation were confirmed by fourier-transform infrared (FTIR), X-ray diffraction (XRD) patterns, and field-emission scanning electron microscopy (FE-SEM) analyses, which contributed to improved interfacial interactions within the nanocomposite structure. Thermogravimetric analysis (TGA) revealed that the synergistic effect of MLDH incorporation and DPA coating significantly increased the T₁₀ values and char residue, indicating enhanced thermal stability and char-forming ability that inhibit flame propagation. Furthermore, the peak heat release rate (pHRR) of the PLA sample including 5 wt% of MLDH coated with DPA (PLN5-DC) decreased 35 %, compared to neat PLA, reflecting improved flame retardancy. The oxygen barrier effect and char reinforcement provided by the MLDH/DPA system raised the limiting oxygen index (LOI) and enabled a UL94 V-0 classification. Mechanical testing showed that the presence of MLDH notably reinforced the PLA matrix, resulting in a substantial increase in tensile strength (up to 77.2 MPa).

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.