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Peculiarities of the initial stages of carbonization processes in polyimide-based nanocomposite films containing carbon nanoparticles

机译：含碳纳米粒子的聚酰亚胺基纳米复合薄膜中碳化过程初始阶段的特殊性

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摘要

Carbonization of the polyimide-based composite films containing carbon nanoparticles, namely nanofibers and nanocones/disks, in the temperature range 500–550°C was studied and the kinetics of the initial stage of carbonization and the effect of the filler on the mechanical properties of the carbonized films were evaluated. Two polyimides (PIs) characterized by different macrochains’ rigidity and different degrees of ordering of the intermolecular structure were used. The character of the nanofiller’s action on the kinetics of the carbonization process depends on the heating rate. In this work, the intensity of the destruction of the PI matrix of the composite films was shown to be slightly higher than that of films of the same polymers with no filler. The introduction of the carbon nanoparticles into both PIs provokes the increase in the ultimate deformation values of the partially carbonized films, while the carbonization of the unfilled PI films yields the brittle materials. The Young’s modulus values of the materials based on the rigid-rod PI do not increase after carbonization, while those for compositions based on the PI with semi-rigid chains increase substantially. Carbon nanocones/disks are characterized by the best compatibility with matrix PIs in comparison with carbon nanofibers.
机译：研究了在500–550°C的温度范围内含碳纳米粒子的聚酰亚胺基复合膜的碳化过程，即纳米纤维和纳米锥/盘，并研究了碳化初期的动力学以及填料对碳纳米管力学性能的影响。评价碳化膜。使用了两种聚酰亚胺（PI），它们的特征是不同的大链刚性和分子间结构的有序度。纳米填料对碳化过程动力学的影响取决于加热速率。在这项工作中，复合膜的PI基体的破坏强度显示为略高于不含填料的相同聚合物膜的破坏强度。将碳纳米颗粒引入两个PI中会引起部分碳化的膜的最终变形值增加，而未填充的PI膜的碳化会产生脆性材料。碳化后，基于刚性棒PI的材料的杨氏模量值不会增加，而基于具有半刚性链的PI的组合物的杨氏模量值不会显着增加。碳纳米锥/盘的特征是与碳纳米纤维相比，与基体PI具有最佳的兼容性。

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