Preparation and characterization of HNTs@ZIF enhanced intrinsic flame retardant RTV silicone rubber

IF 6.3 2区化学 Q1 POLYMER SCIENCE Polymer Degradation and Stability Pub Date : 2024-10-10 DOI:10.1016/j.polymdegradstab.2024.111036

Yaxuan Huang, Jiyu He, Rongjie Yang

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Abstract

Phenylphosphonyl dichloride (BPOD) and 3-aminopropyltriethoxysilane (APTES) were used to prepare phosphorus-nitrogen hexaethoxysilane (BPTES). BPTES was then used for cross-linking and curing hydroxyl‑terminated room-temperature vulcanized (RTV) silicone rubber, providing intrinsic flame retardancy. In addition, halloysite (HNTs) is a kind of tubular silicate, taking advantage of its large aspect ratio, HNTs were used as a template to load ZIF67 on the surface of halloysite to obtain HNTs@ZIF tubular filler. It was added to the above system as a reinforcing and flame-retardant filler by physical blending, and the RTV elastomer with excellent performance was prepared. The successful preparation of phosphorus-containing crosslinkers (BPTES) was demonstrated by FT-IR. After the introduction of the new crosslinker, RTV not only has improved flame retardant performance, but also improved mechanical properties. The tensile strength and elongation at break of RTV with 20 wt.% BPTES are increased by 151 % and 211 %, respectively. The peak heat release rate (pHRR) and the peak of smoke production rate (pSPR) are reduced by 55.9 % and 48.6 %, respectively, and the thermal stability is also improved. In addition, the successful preparation of HNTs@ZIF was confirmed by FT-IR, XRD, XPS, and TEM. By introducing 2 wt.% HNTs@ZIF into 20 wt.% BPTES cured RTV, the intrinsically flame-retardant RTVs with enhanced performance were prepared. It is worth noting that when 2 wt.% HNTs@ZIF is added, the flame retardant and smoke suppression properties of phosphorus-containing silicone rubber are further improved. Because the ZIF contains cobalt metal ions that can be catalyzed into carbon. The pHRR and pSPR decrease by 18.3 % and 16.3 %, respectively, and the total heat release (THR) and total smoke production (TSP) decrease by 23.6 % and 24.4 %, respectively. This work will provide enlightenment for the study of intrinsic flame-retardant RTVs enhanced by modified halloysite.

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HNTs@ZIF 增强型本征阻燃 RTV 硅橡胶的制备与表征

使用苯基二氯化膦（BPOD）和 3-氨基丙基三乙氧基硅烷（APTES）制备磷氮六乙氧基硅烷（BPTES）。然后用 BPTES 交联和固化羟基封端室温硫化（RTV）硅橡胶，使其具有内在阻燃性。此外，埃洛石（HNTs）是一种管状硅酸盐，利用其长径比大的优势，以 HNTs 为模板，在埃洛石表面负载 ZIF67，得到 HNTs@ZIF 管状填料。通过物理混合的方法，将其作为增强和阻燃填料添加到上述体系中，制备出了性能优异的 RTV 弹性体。傅立叶变换红外光谱证明了含磷交联剂（BPTES）的成功制备。引入新的交联剂后，RTV 不仅提高了阻燃性能，还改善了机械性能。含有 20 wt.% BPTES 的 RTV 拉伸强度和断裂伸长率分别提高了 151 % 和 211 %。热释放率峰值（pRR）和烟雾产生率峰值（pSPR）分别降低了 55.9 % 和 48.6 %，热稳定性也得到了改善。此外，FT-IR、XRD、XPS 和 TEM 也证实了 HNTs@ZIF 的成功制备。通过在 20 wt.% BPTES 固化 RTV 中引入 2 wt.% HNTs@ZIF，制备出了性能更高的本征阻燃 RTV。值得注意的是，当加入 2 wt.% HNTs@ZIF 时，含磷硅橡胶的阻燃和抑烟性能得到进一步改善。因为 ZIF 中含有可催化成碳的钴金属离子。pHRR 和 pSPR 分别降低了 18.3% 和 16.3%，总放热量 (THR) 和总产烟量 (TSP) 分别降低了 23.6% 和 24.4%。这项工作将为研究改性埃洛石增强的本征阻燃 RTV 提供启示。

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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.