Flame retardancy and pyrolysis behavior of an epoxy resin composite flame‐retarded by diphenylphosphinyl‐POSS,Polymer Engineering and Science

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Flame retardancy and pyrolysis behavior of an epoxy resin composite flame‐retarded by diphenylphosphinyl‐POSS
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-09-15 , DOI: 10.1002/pen.25533
Congcong Zhai ₁ , Fei Xin ₁ , Liyun Cai ₁ , Yu Chen ₂ , Lijun Qian ₁

Affiliation

To reduce the flammability of epoxy resin (EP), a flame retardant (designated as D‐POSS) containing diphenylphosphinyl and polyhedral oligomeric silsesquioxane (POSS) was constructed by aminopropyl‐isobutyl POSS and diphenylphosphinyl chloride. The chemical structure of D‐POSS was fully characterized, then it was used to enhance the flame retardancy of EP. When the flame‐retardant EP composite contained 4 wt% D‐POSS, its limiting oxygen index value was 29.0% and it achieved UL 94 V‐1 rating. Also, its peak of heat release rate (pk‐HRR), total heat release (THR) and total smoke production were decreased by 35.3%, 30.3%, and 38.3%, respectively. Moreover, the results from cone calorimeter disclosed that diphenylphosphinyl group and POSS group in D‐POSS showed a strong synergistic effect in inhibiting pk‐HRR, THR, and smoke production, promoting the charring formation of EP material, and forming an intumescent char layer. Additionally, the theoretical THR reduction of flame‐retardant EP composite was calculated by the equation deduced from the standard, and it was almost same with the practical THR reduction. Notably, some silicon oxide enriched on the residue's surface. The phenomenon led to form a double‐layer residue that consisted of white yarn‐like outer char and normal intumescent inner char. This double‐layer residue was contributed to enhance EP composite's flame retardancy.

中文翻译：

二苯基次膦基-POSS阻燃环氧树脂复合材料的阻燃性和热解行为

为了降低环氧树脂（EP）的可燃性，通过氨基丙基异丁基POSS和二苯基次膦酰氯构造了一种包含二苯基次膦基和多面体低聚倍半硅氧烷（POSS）的阻燃剂（称为D-POSS）。对D-POSS的化学结构进行了充分表征，然后用于增强EP的阻燃性。当阻燃EP复合材料包含4 wt％的D-POSS时，其极限氧指数值为29.0％，并且达到UL 94 V-1等级。另外，其峰值放热率（pk-HRR），总放热（THR）和总烟雾量分别降低了35.3％，30.3％和38.3％。此外，锥形量热仪的结果表明，D-POSS中的二苯基次膦基和POSS基团在抑制pk-HRR，THR和烟雾产生方面显示出强大的协同作用，促进EP材料炭化的形成，并形成膨胀型炭层。此外，阻燃EP复合材料的理论THR降低值是根据标准推导的公式计算得出的，与实际THR降低值几乎相同。值得注意的是，一些氧化硅富集在残留物的表面上。该现象导致形成由白色纱线状外层炭和正常膨胀内层炭组成的双层残留物。这种双层残留物有助于增强EP复合材料的阻燃性。残留物表面富集了一些氧化硅。该现象导致形成由白色纱线状外层炭和正常膨胀内层炭组成的双层残留物。这种双层残留物有助于增强EP复合材料的阻燃性。残留物表面富集了一些氧化硅。该现象导致形成由白色纱线状外层炭和正常膨胀内层炭组成的双层残留物。这种双层残留物有助于增强EP复合材料的阻燃性。

更新日期：2020-09-15

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