Keqing Zhou , Yaqin Wu , Lian Yin , Jianjian Luo , Kaihua Lu , Bin Yu , Yongqian Shi , Sheng Zhang , Shizhen Jia
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引用次数: 0
摘要
环氧树脂是一种应用广泛的热固性聚合物，但其易燃性和脆性极大地阻碍了它的广泛应用和发展。本研究介绍了一种新型聚磷酸盐改性铁基蒙脱石（Fe-OMT@PZS），旨在增强先进 EP 复合材料的特性。研究结果表明，Fe-OMT@PZS 不仅能均匀地分散在 EP 基体中，还能增强 EP 复合材料的热稳定性和耐火性。与纯 EP 相比，EP/Fe-OMMT@PZS 10 复合材料的峰值放热率 (PHRR)、总放热率 (THR)、峰值产烟率 (PSPR)、总产烟率 (TSP)、峰值一氧化碳产率 (PCO) 和峰值二氧化碳产率 (PCO2) 分别降低了 57.1%、20.5%、50%、44.4%、60% 和 56%。出色的消防安全性能归功于金属化合物和磷酸盐的催化碳化、气相中自由基的捕获、不可燃气体的稀释作用以及 Fe-OMMT 纳米片形成的物理屏障。此外，当 Fe-OMMT@PZS 的含量达到 3 wt% 时，复合材料的力学性能得到了显著改善，断裂伸长率、拉伸强度和拉伸模量分别提高了 58.8%、94.6% 和 161.9%，显示出突出的韧性增强效果。这项研究为解决机械性能和阻燃性之间的平衡问题提供了一种有效的策略。
In situ assembly of polyphosphazene on Fe-MMT nanosheets for high-performance flame-retardant epoxy composites
Epoxy resin is a widely utilized thermosetting polymer, however, its flammability and brittleness significantly hinder its broader application and development. This study introduces a novel polyphosphazene modified iron-based montmorillonite (Fe-OMMT@PZS), aimed at enhancing the characteristics of advanced EP composites. These results revealed that Fe-OMMT@PZS was not only evenly dispersed within the EP matrix, but also enhanced the thermal stability and fire resistance of EP composites. In comparison to pure EP, the EP/Fe-OMMT@PZS 10 composites exhibited reductions of 57.1%, 20.5%, 50%, 44.4%, 60%, and 56% in the peak heat release rate (PHRR), total heat release (THR), peak smoke production rate (PSPR), total smoke production (TSP), peak carbon monoxide production rate (PCO), and peak carbon dioxide production rate (PCO2), respectively. The outstanding fire safety performance was attributed to catalytic carbonization induced by metal compounds and phosphates, the capture of free radicals in gas phase, and dilution effect by non-combustible gases, and the physical barrier created by the Fe-OMMT nanosheets. Furthermore, when the Fe-OMMT@PZS content reached 3 wt%, the composites demonstrated significant improvements in mechanical properties, with increases of 58.8%, 94.6% and 161.9% in elongation at break, tensile strength and tensile modulus, respectively, demonstrating outstanding toughness enhancement. This research provides an effective strategy for tackling the balance between mechanical properties and flame resistance.
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.
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