Flame-retardant wood polymer composites (WPCs) as potential fire safe bio-based materials for building products: Preparation, flammability and mechanical properties
Flame-retardant wood polymer composites (WPCs) as potential fire safe bio-based materials for building products: Preparation, flammability and mechanical properties
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DOI：
10.1016/j.firesaf.2017.11.001
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发表时间：
2019-07-01
影响因子：
3.1
通讯作者：
Wang, De-Yi
中科院分区：
文献类型：
--
作者：
Kalali, Ehsan N.;Zhang, Lu;Wang, De-Yi
提高传统阻燃添加剂的效率是木质聚合物复合材料（WPC）领域的一项具有挑战性的任务。在这项工作中，基于聚磷酸铵（APP）与物理酸改性层状双氢氧化物（Ph-LDH）的组合，开发了新型木塑复合材料阻燃体系。热重分析表明，Ph-LDH 的加入导致 WPC 更早热降解，在降解过程中产生更热稳定的产物，从而改善了炭的形成。采用极限氧指数（LOI）、垂直燃烧（UL-94）和锥形量热试验研究了木塑复合材料的可燃性，结果表明Ph-LDH的添加对其防火性能具有协同作用。锥形量热测试后 WPC 的炭残留物通过扫描电子显微镜 (SEM) 进行表征。使用冲击和拉伸测试分析阻燃木塑复合材料的机械性能。用聚丙烯（PP）部分替代APP会导致拉伸和冲击性能下降，而纳米填料的共同掺入则提高了阻燃木塑复合材料的机械性能。这种具有良好阻燃性和机械性能的木塑复合材料有望用于需要高阻燃性的建筑或家具领域。
Improving the efficiency of traditional flame retardant additives is a challenging task in the field of wood polymer composites (WPCs). In this work, novel flame retardant system for WPCs was developed based on the combination of ammonium polyphosphate (APP) with physic acid modified layered double hydroxide (Ph-LDH). Thermogravimetric analysis illustrated that the incorporation of Ph-LDH resulted in earlier thermal degradation of the WPCs with more thermally stable products during degradation, giving improved char formation. Limiting oxygen index (LOI), vertical burning (UL-94) and cone calorimetry tests were used to study the flammability of WPCs and the results showed that the addition of Ph-LDH had a synergistic effect on their fire performance. The char residues of the WPCs after the cone calorimetry tests were characterised by scanning electron microscopy (SEM). Mechanical properties of the flame retardant WPCs were analysed using impact and tensile tests. Partial substitution of APP with polypropylene (PP) resulted in a deterioration in the tensile and impact properties, while co-incorporation of nano-fillers led to an enhancement of the mechanical performances of the flame retardant WPCs. This WPC with good flame retardant and mechanical properties could potentially be used in the fields of building or furniture which require high flame retardancy.