Synthesis of a novel multi-structure synergistic POSS-GO-DOPO ternary graft flame retardant and its application in polypropylene
Synthesis of a novel multi-structure synergistic POSS-GO-DOPO ternary graft flame retardant and its application in polypropylene
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DOI：
10.1016/j.compositesa.2018.12.006
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
G. Yuan;Bingqing Yang;Yinghong Chen;Yinggang Jia
中科院分区：
文献类型：
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作者：
G. Yuan;Bingqing Yang;Yinghong Chen;Yinggang Jia
通过氧化石墨烯（GO）骨架上的活性官能团与9，10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）和笼型八氨丙基倍半硅氧烷（oapPOSS）反应，成功设计并合成了一种新型多结构协同的石墨烯基三元接枝阻燃剂oapPOSS-graft-GO-graft-DOPO（Psingle bond Gsingle bond D）。并将所得的Psingle bond Gsingle bond D应用于PP阻燃中。与纯PP相比，加入25wt%P单键G单键D后，PP复合材料的峰值放热速率和总放热速率分别降低了78.0%和44.9%。石墨烯/氮/磷/硅多层结构的协同效应主要是由于石墨烯片增强了碳层的阻隔性，阻止了热量和挥发物的传递;含磷基团作为催化剂，加速和促进了凝聚相中的成炭; Sisingle键O单键Si结构提高了热氧化稳定性; P单键G单键D中的氮元素在高温下产生惰性气体，并在气相中发挥主要作用。
Through reaction of the active functional groups on framework of Graphene oxide (GO) with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and cage octaminopropyl silsesquioxane (oapPOSS), a novel multi-structure synergistic graphene-based ternary graft flame retardant oapPOSS-graft-GO-graft-DOPO (Psingle bondGsingle bondD) was designed and synthesized successfully. The obtained Psingle bondGsingle bondD was then applied in PP flame retardation. Compared with pure PP, the peak heat release rate and total heat release of PP composite are reduced by 78.0% and 44.9% via adding 25 wt% Psingle bondGsingle bondD. These notable reductions in fire hazards are mainly due to the synergistic effects of graphene/nitrogen/phosphorus/silicon multi-structures: the graphene sheets enhance the barrier property of carbon layers to prevent heat and volatile transfer; the phosphorus-containing groups as catalyst accelerate and promote the char formation in condensed phase; the Sisingle bondOsingle bondSi structures improve the thermal oxidative stability; the nitrogen elements in Psingle bondGsingle bondD produce the inert gases at high temperature and play a major role in the gaseous phase.