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Preparation and mechanism study of intrinsic hard segment flame‐retardant polyurethane foam
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1002/app.49920 Yinfu Luo 1 , Zongnan Miao 1 , Tong Sun 1 , Huawei Zou 1 , Mei Liang 1, 2 , Shengtai Zhou 1, 2 , Yang Chen 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1002/app.49920 Yinfu Luo 1 , Zongnan Miao 1 , Tong Sun 1 , Huawei Zou 1 , Mei Liang 1, 2 , Shengtai Zhou 1, 2 , Yang Chen 1
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The hard segment of polyurethane foam (PUF) plays a special role in degradation and carbonization. In this work, flame‐retardant hard segment (HSFR) used to promote fire resistance was synthesized successfully. The limiting oxygen index (LOI), vertical combustion, and micro‐combustion calorimetry tests indicated the flame retardancy of the foam was elevated by introducing HSFR. When HSFR with an addition of 60 phr, the LOI value was increased from 17.0 to 25.5%, UL‐94 reached V‐0 rating, the peak heat release rate (p‐HRR) and total heat release (THR) decreased by 63.9% and 10.0%, respectively. In addition, the compressive strength of HSFR‐60 increased by five times. Further, the flame‐retardant mechanism of HSFR was proposed. In vapor phase, HSFR could generate PO and PO2, which combine with flammable free radical and hinder segment decomposition. In condensed phase, HSFR could promote the dehydration and carbonization of chain and the formation of dense and graphitized char. This article provides a practical method for the preparation of green, highly effective, and durable flame‐retardant PUF.
中文翻译：
本征硬段阻燃聚氨酯泡沫的制备及机理研究
聚氨酯泡沫（PUF）的硬段在降解和碳化中起特殊作用。在这项工作中，成功地合成了用于提高耐火性的阻燃硬链段（HSFR）。极限氧指数（LOI），垂直燃烧和微燃烧量热法测试表明，通过引入HSFR可以提高泡沫的阻燃性。当添加60 phr的HSFR时，LOI值从17.0增至25.5％，UL‐94达到V-0等级，峰值放热率（p‐HRR）和总放热（THR）降低了63.9％和10.0％。此外，HSFR-60的抗压强度提高了五倍。此外，提出了HSFR的阻燃机理。在气相中，HSFR可以生成PO和PO 2，与易燃自由基结合并阻碍链段分解。在凝结阶段，HSFR可以促进链的脱水和碳化，并形成致密的石墨化焦炭。本文提供了一种制备绿色，高效，耐用的阻燃PUF的实用方法。
更新日期：2020-11-25
中文翻译：
本征硬段阻燃聚氨酯泡沫的制备及机理研究
聚氨酯泡沫（PUF）的硬段在降解和碳化中起特殊作用。在这项工作中，成功地合成了用于提高耐火性的阻燃硬链段（HSFR）。极限氧指数（LOI），垂直燃烧和微燃烧量热法测试表明，通过引入HSFR可以提高泡沫的阻燃性。当添加60 phr的HSFR时，LOI值从17.0增至25.5％，UL‐94达到V-0等级，峰值放热率（p‐HRR）和总放热（THR）降低了63.9％和10.0％。此外，HSFR-60的抗压强度提高了五倍。此外，提出了HSFR的阻燃机理。在气相中，HSFR可以生成PO和PO 2，与易燃自由基结合并阻碍链段分解。在凝结阶段，HSFR可以促进链的脱水和碳化，并形成致密的石墨化焦炭。本文提供了一种制备绿色，高效，耐用的阻燃PUF的实用方法。
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