Inositol (Ino) is an ideal candidate carbon source for an intumescent flame retardant due to its polyhydroxy structure and biological origin. In the current study, Ino was modified with hexamethylene diisocyanate (HDI) and then compounded with ammonium polyphosphate (APP), forming a novel intumescent flame retardant incorporated into polypropylene (PP). The compounded APP with HDI-modified Ino (APP/HIno) increased the char residue and improved the thermal stability of the PP composites as well as APP/Ino did. Furthermore, when replacing Ino with HIno, the limited oxygen index value and UL-94 rating were improved from 20.9% and no rating of PP/APP/Ino-30 composite to 34.0% and V-0 rating of PP/APP/HIno-30 composite. The limited oxygen index values of PP composites increased with dosage increase of APP/HIno, and a dosage of 23 wt% was enough for the PP composite to pass the V-0 rating. It is suggested that APP/HIno better matched the degradation temperature of PP than APP/Ino and induced the formation of a char layer effectively. © 2021 Society of Industrial Chemistry.

中文翻译：

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一种基于肌醇的碳源的绿色膨胀阻燃体系：聚丙烯的制备和特性

由于其多羟基结构和生物来源，肌醇 (Ino) 是膨胀型阻燃剂的理想候选碳源。在目前的研究中，Ino 用六亚甲基二异氰酸酯 (HDI) 改性，然后与多磷酸铵 (APP) 复合，形成了一种掺入聚丙烯 (PP) 的新型膨胀型阻燃剂。与HDI 改性Ino (APP/HIno) 复合的APP 与APP/Ino 一样，增加了炭残留并提高了PP 复合材料的热稳定性。此外，当用HIno代替Ino时，极限氧指数值和UL-94等级从PP/APP/Ino-30复合材料的20.9%和无等级提高到PP/APP/HIno-的34.0%和V-0等级- 30复合。PP复合材料的极限氧指数值随着APP/HIno用量的增加而增加，23 wt% 的用量足以使 PP 复合材料通过 V-0 等级。表明 APP/HIno 比 APP/Ino 更好地匹配 PP 的降解温度，并有效地诱导了炭层的形成。© 2021 工业化学学会。