填充有对齐的2D材料的弹性体的各向异性溶胀
Anisotropic swelling of elastomers filled with aligned 2D materials
摘要：
对石墨烯增强弹性体在液体中的尺寸溶胀进行了全面研究。用石墨烯纳米片（GNP）增强的样品观察到由GNP的面内取向诱导的各向异性溶胀。在添加GNP后，纳米复合材料的直径溶胀比显著降低，而厚度溶胀比增加，甚至大于未填充的弹性体。膨胀现象已被分析的Flory-Rhener理论的修改。本文提出的新推导的方程，可以准确地预测尺寸溶胀（直径和厚度）的体积溶胀的依赖性，独立于弹性体和溶剂的类型。结合填充弹性体的拉伸性能的评价，还研究了样品的各向异性溶胀。一种新的理论，使GNP增强弹性体的体积膨胀的评估，填料的几何形状和体积分数的基础上已经开发。据发现，橡胶纳米复合材料的溶胀诱导来自石墨烯薄片的双轴约束。
英文摘要：
A comprehensive study has been undertaken on the dimensional swelling of graphene-reinforced elastomers in liquids. Anisotropic swelling was observed for samples reinforced with graphene nanoplatelets (GNPs), induced by the in-plane orientation of the GNPs. Upon the addition of the GNPs, the diameter swelling ratio of the nanocomposites was significantly reduced, whereas the thickness swelling ratio increased and was even greater than that of the unfilled elastomers. The swelling phenomenon has been analyzed in terms of a modification of the Flory-Rhener theory. The newly-derived equations proposed herein, can accurately predict the dependence of dimensional swelling (diameter and thickness) on volume swelling, independent of the type of elastomer and solvent. The anisotropic swelling of the samples was also studied in combination with the evaluation of the tensile properties of the filled elastomers. A novel theory that enables the assessment of volume swelling for GNP-reinforced elastomers, based on the filler geometry and volume fraction has been developed. It was found that the swelling of rubber nanocomposites induces a biaxial constraint from the graphene flakes.
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