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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Fullerene Derivatives on the Gas Permeability of Thermoplastic Polyurethane Elastomers
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Effects of Fullerene Derivatives on the Gas Permeability of Thermoplastic Polyurethane Elastomers

机译：富勒烯衍生物对热塑性聚氨酯弹性体气体渗透性的影响

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摘要

In an effort to improve the gas barrier properties of thermoplastic polyurethane (TPU) elastomers, fullerene derivatives were added as fillers, and the resulting O_2 and CO_2 permeabilities were analyzed. The addition of 5 wt % polyhydroxylated fullerene {fullerenol [C_(60)(OH)_n] mixture, where n=6-12} decreased the gas permeability by approximately 10-20%. According to the hole volumes computed with the results from positron annihilation lifetime spectroscopy, the addition of fullerene derivatives did not produce any changes in the hole volumes of the TPUs. Thus, the reduction in the TPU gas permeability was not caused by changes in the hole volumes. Instead, an inhibited diffusion of gas molecules by fullerene particles was deduced as the cause of the decrease in gas permeability from changes in the diffusion coefficient with temperature. The addition of urethanized fullerene, prepared through the chemical modification of fullerenol, markedly affected the TPU gas barrier properties. As compared to fullerenol addition, the gas barrier properties improved approximately fourfold for O_2 and approximately fivefold for CO_2. These results suggest that the dispersability of urethanized fullerene in TPU was higher than that of fullerenol. We found that the gas barrier properties were independent of the structure of polyol.
机译：为了改善热塑性聚氨酯（TPU）弹性体的阻气性，添加了富勒烯衍生物作为填料，并分析了所得的O_2和CO_2渗透性。添加5wt％的多羟基化富勒烯{富勒烯醇[C_（60）（OH）_n]混合物，其中n ＝ 6-12}使气体渗透率降低约10-20％。根据用正电子an没寿命光谱学结果计算的孔体积，添加富勒烯衍生物不会在TPU的孔体积中产生任何变化。因此，TPU气体渗透率的降低不是由孔体积的变化引起的。取而代之的是，由于扩散系数随温度的变化而导致气体渗透率降低的原因被认为是富勒烯颗粒抑制了气体分子的扩散。通过富勒烯醇的化学改性制备的氨基甲酸酯化的富勒烯显着影响了TPU的气体阻隔性能。与富勒烯醇的添加相比，O_2的气体阻隔性能提高了约四倍，而CO_2则提高了约五倍。这些结果表明，氨基甲酸酯化的富勒烯在TPU中的分散性高于富勒烯醇。我们发现阻气性与多元醇的结构无关。

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