ABSTRACT Carbon nanotubes (CNTs) were organic modified by the synthesized flame retardant (FR) named as spirocyclic pentaerythritol bisphosphorate disphosphoryl chloride/10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (SPDH). CNTs-g-SPDH with a core-shell microstructure was successfully obtained, and its grafting efficiency was calculated to be about 65%. Effects of pristine CNTs and modified CNTs on flame retardation, structure and mechanical properties of high impact polystyrene (HIPS) were investigated. Cone calorimeter results showed that the heat release rate (HRR) and smoke production rate (SPR) of HIPS nanocomposites filled with CNTs or CNTs-g-SPDH were reduced. Moreover, addition of CNTs-g-SPDH resulted in better charring performance than that of pristine CNTs. Modification of CNTs improved compatibility and dispersion in the polymer matrix. Mechanical measurements showed that the Young’s modulus increased, while the tensile strength and elongation at break decreased. The negative effect of CNTs-g-SPDH on tensile strength of HIPS resin was obviously minimized by organic modification of CNTs.

中文翻译：

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有机改性碳纳米管填充高抗冲聚苯乙烯复合材料的阻燃性研究

摘要碳纳米管 (CNT) 被合成的阻燃剂 (FR) 有机改性，命名为螺环季戊四醇二磷酸二磷酰氯/10-(2,5-二羟基苯基)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10 -氧化物（SPDH）。成功获得了具有核壳结构的CNTs-g-SPDH，其接枝效率约为65%。研究了原始碳纳米管和改性碳纳米管对高抗冲聚苯乙烯 (HIPS) 的阻燃性、结构和机械性能的影响。锥形量热仪结果表明，填充有 CNTs 或 CNTs-g-SPDH 的 HIPS 纳米复合材料的放热率 (HRR) 和产烟率 (SPR) 降低。此外，添加 CNTs-g-SPDH 导致比原始 CNT 更好的炭化性能。碳纳米管的改性改善了聚合物基质中的相容性和分散性。机械测量表明杨氏模量增加，而拉伸强度和断裂伸长率降低。CNTs-g-SPDH 对 HIPS 树脂拉伸强度的负面影响通过 CNTs 的有机改性明显降低。