次磷酸铝与Trimer协效阻燃PBT的机理研究

【作者】 刘欣； 屈红强； 徐建中；

【机构】 河北大学化学与环境科学学院；

【摘要】 将Al(H2PO2)3(AHP)和Trimer添加到PBT中,以极限氧指数(LOI)、垂直燃烧测试、锥形量热分析研究了阻燃PBT的燃烧性能。锥形量热分析结果表明PBT/AHP/Trimer展示出良好的消烟性能。通过TG-FTIR、TG-MS研究阻燃PBT的降解过程。AHP和Trimer加入,降低了样品的起始分解温度(T-5%),但促进了残炭的生成。PBT、PBT/25%AHP和PBT/AHP/Trimer的气相降解产物CO2和丁二烯,而PBT/AHP/Trimer产生更少量的CO2和丁二烯,生成更多的残炭。PBT/25%AHP的PO·自由基的含量是PBT/AHP/Trimer的1.3倍,这表明AHP单独使用表现出较强的气相阻燃作用。更多还原

【Abstract】 Flame-retarded PBT has been prepared using aluminum hypophosphite(AHP) and Trimer. The combustion properties of flame-retarded PBT were evaluated using LOI, UL-94 and cone calorimetry. The cone calorimeter data indicated that the presence PBT/AHP/Trimer imported a significant smoke-suppressing effect. The thermal degradation properties of flame-retarded PBT were also investigated using TG-FTIR and TG-MS. The results showed that addition of AHP and Trimer, not only decreased T-5%(defined as the temperature at which 5% of the initial weight has been lost), but also promoted stability of the char residue. For the samples of PBT, PBT/25%AHP and PBT/AHP/Trimer, the main gas pyrolysis products were CO2 and butadiene, while the sample of PBT/AHP/Trimer generated less CO2 and butadiene, and consequently retained more carbon in the matrix. The amount of phosphorus-oxygen radicals of PBT/25%AHP was 1.3 times that of PBT/AHP/Trimer, which indicated that AHP alone showed slightly stronger gaseous phase effect than the combination of AHP and Trimer.更多还原