A novel P-N structure modified halloysite nanotube for simultaneously enhancing flame retardancy and mechanical properties of unsaturated polyester resin

IF 6.3 2区化学 Q1 POLYMER SCIENCE Polymer Degradation and Stability Pub Date : 2025-03-11 DOI:10.1016/j.polymdegradstab.2025.111324

Hang-Ping Fang , Ying-Ming Li , Dan-Ping Zhu , Yao Deng , De-Yi Wang

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Abstract

Unsaturated polyester resin (UPR) is highly flammable due to its long-chain polymer structure composed of hydrocarbon elements, which significantly restricts its application. In this study, an organic-inorganic hybrid flame retardant was developed by using siloxane (KH-560) as a bridging agent to graft bio-based P-N structure (the salt formation of diphenyl phosphoric acid and cytosine) onto the surface of halloysite nanotubes (HNT), resulting in the synthesis of HNT-Si-DC. Experimental results demonstrated that the UPR composite containing 15 wt% HNT-Si-DC achieved a UL-94 V-0 rating, with a limiting oxygen index (LOI) of 33.2 %. Compared to pure UPR, the peak of heat release rate (PHRR) of the composite decreased by 49.8 %. Furthermore, the mechanical properties of the UPR/HNT-Si-DC₁₅ composite were significantly enhanced, with the tensile modulus increasing by 38.7 % and the flexural strength improving by 21.3 % compared to those of pure UPR, indicating high mechanical performance. Additionally, the dense and continuous carbon layer preferentially enhanced the flame retardancy. This work presents a highly efficient approach to designing organic-inorganic hybrid modified HNT for the development of UPR composites with excellent fire resistance and high mechanical properties.

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同时提高不饱和聚酯树脂阻燃性和机械性能的新型 P-N 结构改性埃洛石纳米管

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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.