Synergistic thermal shielding and corrosion protection via Al2O3@HAP-reinforced polypropylene

IF 8.1 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-25 DOI:10.1016/j.polymdegradstab.2026.111958

Salman Khalid , Mohammad Tabish , Yifang Hua , Muhammad Mubeen , Xinyu Chen , Libo Li , H.M. Ahsen Ilyas , Jun Sun , Xiaoyu Gu , Ghulam Yasin , Sheng Zhang

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引用次数: 0

Abstract

Achieving simultaneous flame retardancy and anti-corrosion properties in advanced polypropylene (PP) composites and coatings presents a significant challenge. In this work, porous alumina microspheres (Al₂O₃) were prepared via a hydrothermal method and subsequently calcined at 600°C for 3 hours (h). Al₂O₃ was then hybridized with hydroxyapatite (HAP) nanosheets through sonication followed by simple stirring at ambient temperature for 24 h to obtain the Al₂O₃@HAP nanohybrid. The synthesized Al₂O₃ and Al₂O₃@HAP, together with melamine polyphosphate (MPP) and piperazine pyrophosphate (PAPP), were incorporated into PP as fillers to enhance flame-retardant properties. An MPP/PAPP intumescent flame-retardant (IFR) system was employed due to its high char-forming efficiency and environmentally friendly characteristics, offering a promising alternative to halogenated flame-retardants. The PP/12%IFR/3%Al₂O₃@HAP composite exhibited excellent flame retardancy, as demonstrated by a high limiting oxygen index (LOI) of 28.2%, a V-0 rating in the vertical burning test (UL-94), and substantial reductions in peak heat release rate (pHRR, 86%), total heat release (THR, 43%), and total smoke production (TSP, 44%) compared with the control PP. Furthermore, the Al₂O₃@HAP nanohybrid effectively protected Zn-Al-Mg (ZAM) coated-steel against corrosion. The PP/PP-g-MAH/Al₂O₃@HAP nanocomposite coating maintained a high impedance (|Z|_{0.01 Hz}) of 5.46 × 10⁸ Ω cm² after 60 days of immersion in 3.5 wt% NaCl solution, indicating excellent long-term stability. Pull-off adhesion tests demonstrated that the incorporation of the fillers significantly enhanced the adhesion strength compared with the pristine PP/PP-g-MAH coating. Overall, this research presents an efficient strategy for fabricating advanced PP-based materials with simultaneously improved flame retardancy and corrosion resistance, offering substantial potential for diverse industrial applications.

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通过Al2O3@HAP-reinforced聚丙烯协同热屏蔽和防腐

在高级聚丙烯（PP）复合材料和涂层中实现同时阻燃和防腐性能是一个重大挑战。在这项工作中，通过水热法制备多孔氧化铝微球（Al2O3），随后在600°C下煅烧3小时(h)。通过超声将Al2O3与羟基磷灰石（HAP）纳米片杂交，然后在室温下简单搅拌24 h，得到Al2O3@HAP纳米杂化物。将合成的Al2O3和Al2O3@HAP与三聚氰胺聚磷酸（MPP）和焦磷酸哌嗪（PAPP）作为填料掺入PP中，以提高阻燃性能。采用MPP/PAPP膨胀型阻燃剂（IFR）体系，由于其高成炭效率和环保特性，为卤化阻燃剂提供了一个有前途的替代品。PP/12%IFR/3%Al2O3@HAP复合材料表现出优异的阻燃性能，其极限氧指数（LOI）高达28.2%，垂直燃烧试验（UL-94）的V-0等级较高，峰值放热率（pHRR, 86%）、总放热率（THR, 43%）和总产烟率（TSP, 44%）均显著降低。此外，Al2O3@HAP纳米杂化材料还能有效地保护Zn-Al-Mg （ZAM）涂层钢免受腐蚀。在3.5 wt% NaCl溶液中浸泡60天后，PP/PP-g- mah /Al2O3@HAP纳米复合涂层保持5.46 × 108 Ω cm2的高阻抗（|Z|0.01 Hz），具有良好的长期稳定性。拉拔附着力测试表明，与原始PP/PP-g- mah涂层相比，填料的掺入显著提高了附着力。总的来说，这项研究提出了一种制造先进pp基材料的有效策略，同时提高了阻燃性和耐腐蚀性，为各种工业应用提供了巨大的潜力。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.