分子工程壳寡糖衍生的离子化合物，用于环氧树脂和碳纤维增强聚合物复合材料的高防火安全性，强度和韧性

IF 7.4 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-09-01 DOI:10.1016/j.polymdegradstab.2025.111638

Chunhong Zhang , Wenbo Sui , Hao Liu , Lihe Wang , Lei Shang

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引用次数: 0

摘要

高火灾危险性与高力学性能之间的矛盾是碳纤维增强聚合物（CFRP）进一步应用的障碍。因此，对CFRP复合材料的“强度-韧性-阻燃一体化”策略的需求日益增加。本研究以壳聚糖为原料，通过分子工程设计合成了一种新型质子/非质子离子化合物（PBC-IL）。通过优化分子结构，实现了复合材料防火安全性、机械强度、韧性和“填料-基体”相容性之间的平衡。实验结果表明，与纯EP相比，改性后的PBC-IL/环氧树脂（EP）复合材料具有更好的阻燃性能。当添加剂浓度为1.5%时，pHRR和TSP分别降低19.3%和24.5%，同时达到UL-94 V-0等级。双“离子键”的存在有效地减轻了COS和EP之间的相分离。同时，PBC-IL/EP的抗弯强度达到163.5 MPa，冲击强度达到17.5 kJ·m-2，分别比EP提高了135.9%和164.8%。与EP/CFRP相比，PBC-IL/EP/CFRP的抗弯强度为1219.8 MPa，层间剪切强度（ILSS）为87.8 MPa，分别提高了26.7%和44.8%。这有效地克服了强度、韧性和阻燃性之间的冲突。

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Molecularly engineered chito-oligosaccharide-derived ionic compounds for high fire safety, strength, and toughness in epoxy Resins and carbon fiber reinforced polymer composites

The contradiction between high fire hazard and mechanical performance presents a barrier to the further application of carbon fiber reinforced polymers (CFRP). As a result, there is an increasing need for a "strength-toughness-flame-retardant integration" strategy for CFRP composites. In this study, a novel (protonic/aprotic) ionic compound (PBC-IL) derived from chitosan oligosaccharide (COS) was synthesized through molecular engineering design. By optimizing the molecular structure, a balance was achieved among the fire safety, mechanical strength, toughness, and "filler-matrix" compatibility of the composites. Experimental results show that the modified PBC-IL/epoxy (EP) composite exhibits superior flame-retardant properties compared to pure EP. At a 1.5 % additive concentration, pHRR and TSP are reduced by 19.3 % and 24.5 %, respectively, while achieving a UL-94 V-0 rating. The presence of dual "ionic bonds" effectively mitigates phase separation between COS and EP. Meanwhile, the bending strength of PBC-IL/EP reaches 163.5 MPa, and the impact strength reached 17.5 kJ·m^-2, showing an improvement of 135.9 % and 164.8 %, respectively, compared to EP. The bending strength of PBC-IL/EP/CFRP was 1219.8 MPa, and the interlaminar shear strength (ILSS) was 87.8 MPa, exhibiting increased of 26.7 % and 44.8 %, respectively, compared to EP/CFRP. This effectively overcomes the conflict between strength, toughness, and flame retardancy.

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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.