Zhang Daohai, Pei Meng, Wei Ke, Tan Fang, Gao Chengtao, Bao Dongmei, Qin Shuhao
School of Chemical Engineering of Guizhou Minzu University, Guizhou, China.
National Engineering Research Center for Compounding and Modification of Polymer Materials, Guizhou, China.
Front Chem. 2022 May 11;10:894112. doi: 10.3389/fchem.2022.894112. eCollection 2022.
The DOPO derivative-conjugated flame retardant 4, 4'-{1'', 4'' - phenylene - bis [amino - (10‴ - oxy -10‴-hydro-9‴-hydrogen-10‴ λ -phosphaphenanthrene-10''-yl)-methyl]}-diphenol (P-PPD-Ph) with two hydroxyl groups was synthesized. Polylactic acid conjugated flame-retardant composites with P-PPD-Ph were papered by using a twin-screw extruder. The flame-retardant properties of polylactic acid-conjugated flame-retardant composites were investigated. The flame-retardant properties of PLA-conjugated flame-retardant composites were characterized by the limiting oxygen index (LOI) and the vertical burning test (UL94). The results showed that the PLA-conjugated flame-retardant composites achieved a V-0 rating (UL-94, 3.2 mm) when the conjugated flame retardant was added at 5 wt%, and increase in LOI value from 22.5% to 31.4% relative to composites without added conjugated flame retardant. The flame-retardant mechanism of PLA-conjugated flame-retardant composites were further studied by TG-FTIR, the results showed that the P-PPD-Ph promoted the PLA-conjugated flame-retardant composites to decompose and also released fragments with quenching and dilution, which suggests that P-PPD-Ph for PLA-conjugated flame-retardant composites mainly play a role of the gas-phase flame retardant.
合成了具有两个羟基的9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）衍生物共轭阻燃剂4,4'-{1'',4''-亚苯基-双[氨基-(10‴-氧-10‴-氢-9‴-氢-10‴λ-磷杂菲-10''-基)-甲基]}-二苯酚（P-PPD-Ph）。采用双螺杆挤出机制备了含P-PPD-Ph的聚乳酸共轭阻燃复合材料。研究了聚乳酸共轭阻燃复合材料的阻燃性能。通过极限氧指数（LOI）和垂直燃烧试验（UL94）对聚乳酸共轭阻燃复合材料的阻燃性能进行了表征。结果表明，当共轭阻燃剂的添加量为5 wt%时，聚乳酸共轭阻燃复合材料达到了V-0级（UL-94，3.2 mm），相对于未添加共轭阻燃剂的复合材料，其LOI值从22.5%提高到了31.4%。通过TG-FTIR进一步研究了聚乳酸共轭阻燃复合材料的阻燃机理，结果表明，P-PPD-Ph促进了聚乳酸共轭阻燃复合材料的分解，同时释放出具有淬灭和稀释作用的碎片，这表明P-PPD-Ph对聚乳酸共轭阻燃复合材料主要起到气相阻燃的作用。
