To further study the effect of the phosphorus, sulfur, and nitrogen-containing flame retardant on epoxy resin, a DOPO-based phenol derivative 4-[(benzothiazolyl 2-amino)(6-oxido-6H-dibenz[c,e][1,2]oxaphosphorin-6-yl) methyl] phenol namely D-P-A, was successfully synthesized from 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), p-hydroxybenzaldehyde (PHBA), and 2-aminobenzothiazole (ABZ), and used to flame retard epoxy resin (EP). As expected, D-P-A imparted flame retardance to epoxy resin. For example, with 7.5 wt% loading of D-P-A, epoxy thermoset passed a UL-94 V-0 rating, and got a LOI value of 29.6%. Besides, D-P-A played an effective role in inhibiting heat release of EP, that EP/7.5% D-P-A showed a peak of heat release rate (PHRR) of 713 kW/m² much lower than 1137 kW/m² of EP. However, it decomposed in advance owing to the lower thermal stability of D-P-A. Finally, through Scanning electron microscopy (SEM), Raman spectra and X-ray photoelectron spectroscopy (XPS) and pyrolysis-gas chromatograph/mass spectrometer (Py-GC/MS), it disclosed that D-P-A exerted its flame-retardant activity both in the vapor and condensed phase.

为了进一步研究磷，硫和氮的阻燃剂对环氧树脂的影响，使用了一种基于DOPO的酚衍生物4-[（（苯并噻唑基2-氨基）（6-氧化-6H-二苯并[c，e]] [由9、10-二氢-9-氧杂-10-磷杂菲-10氧化物（DOPO），对羟基苯甲醛（PHBA）和2 -氨基苯并噻唑（ABZ），并用于阻燃环氧树脂（EP）。不出所料，DPA使环氧树脂具有阻燃性。例如，在DPA负载量为7.5 wt％的情况下，环氧热固性材料通过了UL-94 V-0评级，LOI值为29.6％。此外，DPA在抑制EP的热释放方面发挥了有效作用，EP / 7.5％DPA的热释放率（PHRR）峰值为713 kW / m ^2。远低于EP的1137 kW / m ²。然而，由于DPA的较低的热稳定性，它会预先分解。最后，通过扫描电子显微镜（SEM），拉曼光谱和X射线光电子能谱（XPS）以及热解气相色谱/质谱仪（Py-GC / MS），它揭示了DPA在两种材料中均发挥了阻燃作用。蒸气和冷凝相。