A Branched Polyelectrolyte Complex Enables Efficient Flame Retardant and Excellent Robustness for Wood/Polymer Composites.
A Branched Polyelectrolyte Complex Enables Efficient Flame Retardant and Excellent Robustness for Wood/Polymer Composites.
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DOI：
10.3390/polym12112438
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发表时间：
2020-10-22
期刊：
影响因子：
5
通讯作者：
Mei C
中科院分区：
文献类型：
--
作者：
Huang Y;Zhang S;Chen H;Ding C;Xuan Y;Pan M;Mei C
木材/热塑性复合材料（WPC）由于其固有的高燃烧性和较低的韧性而在建筑结构和电气设备的某些领域受到限制。在本工作中，通过自组装将阳离子聚乙烯亚胺（PEI）引入纤维素纳米晶体（CNC）和聚磷酸铵（APP）中，设计了一种支化交联网络聚乙烯亚胺复合物（PEC）。PEC提供的氢键相互作用、渗透和机械互锁有效地增强了基体、木纤维和阻燃剂之间的界面结合。有趣的是，它在WPC的内部结构上产生了丰富的微孔。优异的界面结合性能和易于移动的分子链成功地传递了应力并引起能量耗散，同时使WPC具有更高的强度和韧性。同时PEC赋予WPC在抑烟性和UL-94 V-0等级上的提升。当PEC的质量分数为25%时，WPC的峰值热释放速率和总烟气释放量分别降低了36.9%和50.0%。一个简单，环保，简洁的策略展示了纤维增强聚合物复合材料具有有效的阻燃性和机械鲁棒性的前景。
Wood/thermoplastic composites (WPCs) have been restricted in some fields of building construction and electrical equipment because of their inherent high flammability and lower toughness. In this work, a branched crosslinking network polyelectrolyte complex (PEC) has been designed by incorporation of polyethyleneimine (PEI), a cation polyelectrolyte end capped amine groups, into cellulose nanocrystals (CNC), and ammonium polyphosphate (APP) via self-assembling. The hydrogen bonding interactions, penetration, and mechanical interlock provided by PEC effectively enhance the interfacial bonding within matrix, wood fibers, and flame retardant. Interestingly, it generates abundant micropores on the inner structure of WPC. The excellent interfacial bonding performance and easy-to-move molecular chain successfully transfer the stress and induce energy dissipation, simultaneously giving rise to higher strength and toughness for WPC. As well as the PEC endows WPC with a promotion in both smoke suppression and UL-94 V-0 rate. Additionally, the peak heat release rate and total smoke release for WPC obviously reduce by 36.9% and 50.0% respectively in presence of 25% PEC. A simple, eco-friendly, and concise strategy exhibits prospects for fiber-reinforced polymer composites with effective flame retardancy and mechanical robust properties.
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影响因子：
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