Highly flame retardant and mechanical strong polyurea through synergistic effects of aromatic dianhydride and ammonium polyphosphate

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2024-12-16 DOI:10.1016/j.polymer.2024.127951
Hongyang Deng, Lixian Guo, Keping Chen, Ping Zhang, Yewei Xu, Ningning Song, Chunrong Tian, Jianhua Wang, Shuen Liang
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Abstract

Polyurea (PUA) elastomers have gained increasing attention in both defense and civilian fields due to its remarkable mechanical properties and protective capabilities. However, its high flammability significantly limits its application in many fields. It is challenging to achieve high flame retardant rating and maintain high mechanical properties simultaneously. Synergistic combination of different types of flame retardants is essential for this purpose. Herein we report a highly efficient synergistic combination of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and ammonium phosphate (APP) for flame retardance of PUA. BTDA contributes to excellent char-forming in solid phase, and APP contributes to radical scavenging in gaseous phase. By incorporating BTDA and APP as additive flame retardants in PUA, the melt dripping in combustion was entirely suppressed, and V-0 rating in UL-94 test was achieved. The heat release rate and the release of smoke and toxic gases were greatly reduced. Meanwhile, the mechanical properties of PUA were maintained very well. The PUA composites with outstanding flame retardancy and mechanical properties may serve as ideal protective materials in a variety of applications.

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聚脲(PUA)弹性体因其卓越的机械性能和防护能力,在国防和民用领域都获得了越来越多的关注。然而,聚脲的易燃性极大地限制了它在许多领域的应用。既要达到较高的阻燃等级,又要保持较高的机械性能是一项挑战。为此,不同类型阻燃剂的协同组合至关重要。在此,我们报告了一种 3,3′,4,4′-二苯甲酮四羧酸二酐(BTDA)和磷酸铵(APP)的高效协同组合,用于聚氨酯的阻燃。BTDA 在固相中具有优异的成炭性,APP 在气相中具有自由基清除性。将 BTDA 和 APP 作为添加型阻燃剂加入聚氨酯中,完全抑制了燃烧中的熔融滴落,并在 UL-94 试验中达到了 V-0 级。热释放率和烟雾及有毒气体的释放量大大降低。同时,PUA 的机械性能也保持得很好。该 PUA 复合材料具有出色的阻燃性和机械性能,可作为理想的防护材料应用于多种领域。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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