ABSTRACT

The relationship between the structure of polyimide (PI) and the reinforcement effect of added graphene oxide (GO) remains relatively unexplored, despite extensive studies on composite materials prepared from PI and GO. This study demonstrated that the addition of aliphatic groups increased the reinforcement effect of GO on PI. The PI/GO composite films were prepared by blending and thermal curing. Subsequently, the performance of the two films with similar structures, which were used in the study, was compared. The thermogravimetric analysis (TGA) results revealed the excellent heat resistance of the new PI/GO composite at a temperature as high as 498°C. The results of the dielectric test confirmed that there was no significant change in the dielectric constant after ternary-copolymerization-induced modification. The tensile strength of the composite increased by ~24% and reached 133 MPa. The morphological observation of the fracture surfaces by scanning electron microscopy confirmed that the reinforcement effect of GO was optimized by the addition of the aliphatic groups. Therefore, aliphatic PI was effectively reinforced by GO. The results of this study will facilitate the utilization of GO for the preparation of high-performance composites for diverse industrial applications.

摘要

尽管对由PI和GO制备的复合材料进行了广泛的研究，但聚酰亚胺（PI）的结构与添加的氧化石墨烯（GO）的增强效果之间的关系仍未得到探究。这项研究表明，添加脂肪族基团可以提高GO对PI的增强作用。PI / GO复合膜是通过共混和热固化制备的。随后，比较了研究中使用的两种结构相似的薄膜的性能。热重分析（TGA）结果表明，新型PI / GO复合材料在高达498°C的高温下具有出色的耐热性。介电试验的结果证实，三元共聚引起的改性后介电常数没有显着变化。复合材料的拉伸强度提高了约24％，达到133 MPa。通过扫描电子显微镜对断裂表面进行形态学观察证实，通过添加脂族基团可以优化GO的增强效果。因此，GO有效地增强了脂肪族PI。这项研究的结果将有助于利用GO制备用于各种工业应用的高性能复合材料。