插铁蒙脱土原位改性酚醛树脂的石墨化性能及抗烧蚀性能

IF 7.4 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-09-23 DOI:10.1016/j.polymdegradstab.2025.111688

Zhongzhou Zhang, Ruijin Cui, Yifei Li, Liqun Zhang, Fei Chen, Yuhong Liu

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引用次数: 0

摘要

酚醛树脂(PR)/蒙脱土（MMT）纳米复合材料由于其良好的耐热性和价格优势，被广泛用作热防护系统的基体。然而，在热解过程中实现均匀的MMT分散和促进基体石墨化仍然存在挑战。在这项工作中，通过“Fe3+辅助MMT分散”策略合成了一种新型的铁插层MMT修饰PR (FeMMTPR)，与传统的PR/MMT复合材料相比，MMT分散均匀，耐烧蚀。具体来说，通过一种简单环保的方法，将FeCl3与MMT嵌入水中，得到了铁插层蒙脱土（FeMMT）。利用Fe3+对苯酚的吸附和苯酚与甲醛的加成反应，使MMT片层脱落。均匀分散的FeMMT的“迷宫效应”有效增强了FeMMTPR的热性能，降低了热解过程中气体和芳香族碎片的释放强度。同时，Fe的存在促进了FeMMTPR在高温下的石墨化，有效提高了碳纤维增强FeMMTPR （CF/FeMMTPR）复合材料的耐烧蚀性。通过这种简单的策略，解决了MMT分散和基体石墨化的挑战，为开发具有良好耐热和耐烧蚀性的航空航天复合材料提供了可扩展的途径。

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Graphitization behavior and ablation resistance of phenolic resin modified in-situ with iron-intercalated montmorillonite

Phenolic resin (PR)/montmorillonite (MMT) nanocomposites are widely used as matrices for thermal protection systems due to their good heat resistance and price advantage. However, challenges persist in achieving homogeneous MMT dispersion and promoting matrix graphitization under pyrolysis process. In this work, a novel iron-intercalated MMT-modified PR (FeMMTPR) was synthesized by a “Fe³⁺-assisted MMT dispersion” strategy with homogeneous MMT dispersion and ablation resistance compared to conventional PR/MMT composites. Specifically, iron intercalated montmorillonite (FeMMT) was obtained by intercalating FeCl₃ with MMT in water through a simple and environmentally friendly method. Benefiting from the attraction of Fe³⁺ to phenol and the addition reaction between phenol and formaldehyde, the MMT sheet layer was exfoliated. The “maze effect” of homogeneous dispersed FeMMT effectively enhanced the thermal properties of FeMMTPR, reducing the release intensity of gases and aromatic fragments during pyrolysis. Meanwhile, the presence of Fe promoted the graphitization of FeMMTPR under high temperature, which effectively improved the ablation resistance of carbon fiber reinforced FeMMTPR (CF/FeMMTPR) composites. By addressing the challenges of dispersion of MMT and graphitization of the matrix through this simple strategy, a scalable pathway is provided for the development of aerospace composites with promising heat and ablation resistance.

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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.