Constructing a Multifunctional Reactive MXene-Based Additive for Micro-Crosslinking Polyurea Elastomer to Achieve Superior Mechanical Properties and Enhanced Fire Safety
作者：Qinyong Liu
關(guān)鍵字：Polyurea, Reactive additive, Micro-crosslinking, Mechanical strength, Flame retardancy, Flexible strain sensors
論文來源：期刊
發(fā)表時間：2024年
The widespread application of polyurea (PUA) in protective coatings typically requires excellent flame retardancy due to real-world usage scenarios. However, the addition of flame retardant additives often compromises the material’s mechanical properties. In this study, a multifunctional reactive additive, MX-SP-NH2, was creatively prepared by covalently grafting spirocyclic pentaerythritol bisphosphorate disphosphoryl chloride (SPDPC) onto MXene (Ti3C2Tx) surfaces, followed by the introduction of 1,3-propanediamine (PDA) by the reaction with SPDPC. MX-SP-NH2 was then incorporated into PUA, participating in its crosslinking process and significantly enhancing both its mechanical strength and flame retardancy. Compared to the control PUA sample, the micro-crosslinked PUA sample with just 1.0 wt% MX-SP-NH2 demonstrated a 184.3% increase in tensile strength, a 126.1% increase in elongation at break, and a 436.3% increase in toughness. The flammability characterization revealed that the peak heat release rate, peak smoke production rate, and peak CO production rate were reduced by 31.7%, 28.9%, and 61.5%, respectively, indicating a substantial improvement in fire safety. Additionally, the flame retardant PUA-based flexible strain sensors demonstrated stable electrical signal responsiveness. This work has opened up new potential applications of PUA in flexible electronics.
由于實際使用場景，聚脲（PUA）在保護(hù)涂料中的廣泛應(yīng)用通常需要優(yōu)異的阻燃性。然而，添加阻燃添加劑往往會損害材料的機(jī)械性能。在這項研究中，通過將螺環(huán)季戊四醇雙磷酸酯二磷酰氯（SPDPC）共價接枝到MXene（Ti3C2Tx）表面，然后通過與SPDPC的反應(yīng)引入1,3-丙二胺（PDA），創(chuàng)造性地制備了一種多功能反應(yīng)性添加劑MX-SP-NH2。然后將MX-SP-NH2摻入PUA中，參與其交聯(lián)過程，顯著提高其機(jī)械強(qiáng)度和阻燃性。與對照PUA樣品相比，僅含1.0 wt%MX-SP-NH2的微交聯(lián)PUA樣品的拉伸強(qiáng)度提高了184.3%，斷裂伸長率提高了126.1%，韌性提高了436.3%?？扇夹员碚鞅砻?，峰值熱釋放率、峰值煙霧產(chǎn)生率和峰值CO產(chǎn)生率分別降低了31.7%、28.9%和61.5%，表明消防安全得到了實質(zhì)性改善。此外，基于阻燃PUA的柔性應(yīng)變傳感器表現(xiàn)出穩(wěn)定的電信號響應(yīng)性。這項工作開辟了PUA在柔性電子領(lǐng)域的新的潛在應(yīng)用。