Surface construction of aluminum diethylphosphinate for improving flame retardant and mechanical properties of PA6 composites

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-10-08 DOI:10.1016/j.jaap.2025.107420

Bin Tao, Yan Zhang, Lubin Liu, Ruiping Wang, Suliang Gao, Tao Han, Xiaoli Li, Hanlin Huang, Miaojun Xu, Bin Li

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引用次数: 0

Abstract

The inherent flammability of polyamide 6 (PA6) substantially limits its applicability in electronic components and rail transportation sectors. Although traditional aluminum diethylphosphite (ADP) can reduce the flammability of PA6, its poor compatibility with PA6 matrix leads to a significant decrease of the mechanical properties of PA6 composites at high addition levels. In this study, a phosphorous-containing novel anionic long-chain surfactant was used to reconstruct the surface of ADP and the modified aluminum diethylphosphite (MADP) was introduced into PA6 matrix. Only 9 wt% MADP enabled PA6 to achieve UL-94 V-0 rating and the LOI of PA6/MADP reached to 28.3 %. Theoretical simulations indicated that the flame retardant mechanism of PA6/MADP involves both condensed-phase shielding and gas-phase radical inhibition effect. Therefore, under the same addition, the PHRR and THR of PA6/MADP were reduced by 44.8 % and 17.5 % compared to pure PA6. Meanwhile, the surface restructuring of ADP enhanced the entanglement and compatibility between MADP and PA6 molecular chains. Consequently, the tensile strength and notched impact strength of PA6/MADP were enhanced by 6.3 % and 26.4 % compared to PA6/ADP. This prepared PA6/MADP composite with excellent flame retardancy and mechanical properties, shows significant practical application potential in fields such as electronics, electrical appliances, and the automotive industry.

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改善PA6复合材料阻燃性能和力学性能的二乙基膦酸铝表面构造

聚酰胺6 （PA6）固有的可燃性极大地限制了其在电子元件和铁路运输部门的适用性。传统的二乙基亚磷酸铝（ADP）虽然可以降低PA6的可燃性，但其与PA6基体的相容性较差，导致高添加量下PA6复合材料的力学性能明显下降。本研究采用一种新型的含磷阴离子长链表面活性剂对ADP进行表面重构，并将改性后的二乙基亚磷酸铝（MADP）引入到PA6基体中。只有9 wt%的MADP才能使PA6达到UL-94的V-0等级，PA6/MADP的LOI达到28.3 %。理论模拟表明，PA6/MADP的阻燃机理既有凝聚相屏蔽作用，也有气相自由基抑制作用。因此，在相同添加量下，PA6/MADP的PHRR和THR比纯PA6分别降低了44.8 %和17.5 %。同时，ADP的表面重组增强了MADP与PA6分子链之间的纠缠和相容性。与PA6/ADP相比，PA6/MADP的抗拉强度和缺口冲击强度分别提高了6.3 %和26.4 %。所制备的PA6/MADP复合材料具有优异的阻燃性能和力学性能，在电子、电器、汽车等领域具有显著的实际应用潜力。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.