Epoxy resin modified polyisocyanurate (EP-PIR) foams were successfully prepared by the reaction of polymethylene polyphenylene isocyanate (PAPI) and diglycidyl ether of bisphenol-A (DGEBA). Thermogravimetric analysis coupled with infrared spectrometry (TGA-IR) was performed to investigate the thermostability and the gaseous pyrolysis products of EP-PIR foams. The results indicated that the excellent thermostability of EP-PIR foams was due to the abundant highly thermostable isocyanurate ring and oxazolidone ring. The flame retardation of EP-PIR foams was also investigated. UL94 results revealed that the foams with [PAPI]/[DGEBA] ratio above 2.5 could reach V-0 classification. With increasing the stoichiometry of [PAPI]/[DGEBA], the limiting oxygen index values increased linearly from 24.5 to 30.0 vol %. Scanning electron microscopy images of burned foams illustrated the flame-retardant mechanism was due to the excellent charring ability. Cone calorimeter tests showed that the peaks of heat release rate were always as low as 266.5 kW/m². Moreover, highly thermostable isocyanurate ring played an important role in the suppression of smoke emission.

通过聚亚甲基聚亚苯基异氰酸酯（PAPI）和双酚A的二缩水甘油醚（DGEBA）的反应成功地制备了环氧树脂改性的聚异氰脲酸酯（EP-PIR）泡沫。进行了热重分析和红外光谱分析（TGA-IR），以研究EP-PIR泡沫的热稳定性和气态热解产物。结果表明，EP-PIR泡沫具有出色的热稳定性，这归因于丰富的高度热稳定的异氰脲酸酯环和恶唑烷酮环。还研究了EP-PIR泡沫的阻燃性。UL94结果表明，[PAPI] / [DGEBA]比大于2.5的泡沫可以达到V-0级。随着[PAPI] / [DGEBA]的化学计量的增加，极限氧指数值从24.5vol％线性增加到30.0vol％。燃烧的泡沫的扫描电子显微镜图像说明了阻燃机理是由于优异的炭化能力。锥形量热仪测试表明，放热率的峰值始终低至266.5 kW / m²。此外，高度耐热的异氰脲酸酯环在抑制烟气排放中起重要作用。