Flame retardant epoxy resin based on organic titanate and polyhedral oligomeric silsesquioxane-containing additives with synergistic effects
Flame retardant epoxy resin based on organic titanate and polyhedral oligomeric silsesquioxane-containing additives with synergistic effects
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基于有机钛酸酯和多面体低聚倍半硅氧烷添加剂的具有协同作用的阻燃环氧树脂
DOI：
10.1039/c7ra02529g
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Dai, Lizong
中科院分区：
文献类型：
--
作者：
Zeng, Birong;Liu, Yongzhou;Dai, Lizong
为了开发一种具有良好热性能、力学性能和阻燃性能的新型环氧树脂（EP），合成了由一个多面体低聚倍半硅氧烷（POSS）和两个9，10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）单元组成的复合物POSS-bisDOPO，并将其作为共添加剂与钛酸四丁酯一起构建了磷-硅-钛协同体系。与纯EP相比，EP复合材料的残炭率增加。当POSS-bisDOPO含量为5%时，环氧树脂的氧指数达到31.0%，UL-94等级达到V-0级。PHRR和THR降低到28.4 W g−1和1.7 kJ g−1。SEM结果表明，EP复合材料的炭化层具有蜂窝状的内层和连续致密的外层，有利于形成有效的物理屏障，阻碍氧气和热量的渗透。DMA和三点弯曲试验结果表明，EP复合材料的力学性能没有下降。
In order to develop a new epoxy resin (EP) possessing good thermal and mechanical properties as well as flame retardancy performance, the compound POSS-bisDOPO consisting of one polyhedral oligomeric silsesquioxane (POSS) and two unit of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was synthesized and used as co-additive with tetrabutyl titanate to construct a phosphorous–silicon–titanium synergy system. Compared to pure EP, the char yields of the EP composites were increased. The LOI value and UL-94 ratings of the EP composite with a loading of 5% POSS-bisDOPO reached 31.0% and V-0 grade, respectively. The PHRR and THR reduced to 28.4 W g−1 and 1.7 kJ g−1. SEM results indicated that the char of the EP composites had an alveolate inner layer and continual compact outer layer, which was conducive to form effectively physical barrier to hinder the penetrating of oxygen and heat. DMA and three-point bending test results showed the mechanical property of the EP composites had no decline.