Hao Wu, Dengwang Lai, Mengyao Nan, Wuyan Cao, Li Liu, Yuejun Liu, Jun Yang
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The investigation of the flame-retardant mechanism employed thermogravimetric-infrared (TG-IR), scanning electron microscopy (SEM), Raman spectroscopy, and infrared spectroscopy. The results demonstrate that the CO<sub>2</sub> and NH<sub>3</sub> flame retardant microbubbles within the composite film render it less ignitable at the initial stage, and that the internal UM of the composite film continues to decompose, releasing CO<sub>2</sub> and NH<sub>3</sub> upon heating. In addition, the acidic substances decomposed by PA during combustion promote the dehydration, cross-linking, and cyclization of PVA, generating chemical structures such as P<span></span>O<span></span>C, P<span></span>O<span></span>P, and PO<sub>4</sub> with enhanced thermal stability. 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引用次数: 0
摘要
本文利用植酸(PA)和尿素(UM)在聚乙烯醇(PVA)溶液中的反应合成阻燃气体(CO2、NH3),制备含有阻燃微气泡的 PVA 复合薄膜。采用极限氧指数(LOI)、垂直燃烧(UL 94)和锥体量热法等方法评估了 PVA 复合薄膜的阻燃性。结果表明,与纯 PVA 薄膜相比,含有阻燃微泡的 PVA 复合薄膜的 LOI 从 20% 提高到 30%,UL 94 达到 VTM-0。此外,与纯 PVA 薄膜相比,其峰值放热率和放热总量分别降低了 36.25% 和 38.92%。阻燃机理的研究采用了热重-红外(TG-IR)、扫描电子显微镜(SEM)、拉曼光谱和红外光谱。结果表明,复合薄膜内的 CO2 和 NH3 阻燃微气泡使其在初始阶段的可燃性降低,复合薄膜内部的 UM 不断分解,在加热时释放出 CO2 和 NH3。此外,PA 在燃烧过程中分解出的酸性物质会促进 PVA 的脱水、交联和环化,生成热稳定性更强的化学结构,如 POC、POP 和 PO4。这有利于形成连续、致密的炭层,阻碍氧气和热量向内部传递。
Flame retardant polyvinyl alcohol film with self-releasing carbon dioxide and ammonia from phytic acid and urea
This paper utilizes the reaction of phytic acid (PA) and urea (UM) in polyvinyl alcohol (PVA) solution to synthesize flame retardant gasses (CO2, NH3) for the preparation of PVA composite films containing flame retardant microbubbles. The flame retardancy of PVA composite films was assessed using methods including limiting oxygen index (LOI), vertical burning (UL 94), and cone calorimetry. The results indicated an increase in the LOI of the PVA composite film containing flame retardant microfoam from 20% to 30% compared with the pure PVA film, and that UL 94 reached VTM-0. Furthermore, its peak exothermic rate and total exothermic amount were reduced by 36.25% and 38.92%, respectively, compared with the pure PVA film. The investigation of the flame-retardant mechanism employed thermogravimetric-infrared (TG-IR), scanning electron microscopy (SEM), Raman spectroscopy, and infrared spectroscopy. The results demonstrate that the CO2 and NH3 flame retardant microbubbles within the composite film render it less ignitable at the initial stage, and that the internal UM of the composite film continues to decompose, releasing CO2 and NH3 upon heating. In addition, the acidic substances decomposed by PA during combustion promote the dehydration, cross-linking, and cyclization of PVA, generating chemical structures such as POC, POP, and PO4 with enhanced thermal stability. This encourages the formation of a continuous, dense charcoal layer and impedes the transfer of oxygen and heat into the interior.
期刊介绍:
The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.