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首页> 外文期刊>Journal of Applied Polymer Science >The Effect of Surface Treatment on Graphite Nanoplatelets Used in Fiber reinforced Composites
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The Effect of Surface Treatment on Graphite Nanoplatelets Used in Fiber reinforced Composites

机译：表面处理对纤维增强复合材料中使用的石墨纳米片的影响

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Atmospheric plasma treatment (APT) was used to surface-activate graphite nanoplatelets (GnP) as well as highly graphitic P100 fibers used to manufacture composites. X-ray photoelectron spectroscopy showed an increase in the O/C ratio of the treated surfaces when using either CO or O_2 as the active gas, whereas CO exhibited less damage to the treated reinforcement carbon material. APT of P100 fibers resulted in a 75% increase in composite tensile strength when compared to composites using untreated fibers. Surface treatment of GnPs also resulted in GnP/epoxy composites with significantly higher glass transition temperatures (Tg's) and 50% higher flexural strengths than those with no surface treatment because of stronger particle-to-resin coupling, which was also evidenced by the fracture surfaces. The effect of GnP loading concentration and plasma treatment duration was also evaluated on the tensile strength of fiber-reinforced composites. The addition of untreated GnP filler resulted in a decrease in strength up to the 1% loading. However, higher loading conditions resulted in a 20% improvement because of GnP orientation effects. Fracture surfaces suggest that the fibers provided a mechanism for the GnPs to orient themselves parallel to the fiber axis, developing an oriented matrix microstructure that contributes to added crack deflection. Incorporating surface-treated GnPs in these composites resulted in tensile strengths that were as high as 50% stronger than the untreated systems for all loading conditions. Increased GnP-to-matrix bonding as well as enhanced orientation of the GnPs resulted in multifunctional composites with improved mechanical performance.
机译：大气等离子体处理（APT）用于表面活化石墨纳米片（GnP）以及用于制造复合材料的高度石墨化的P100纤维。 X射线光电子能谱显示，当使用CO或O_2作为活性气体时，处理过的表面的O / C比增加，而CO对处理过的增强碳材料的损害较小。与使用未经处理的纤维的复合材料相比，P100纤维的APT可使复合材料的拉伸强度提高75％。 GnPs的表面处理还导致GnP /环氧树脂复合材料的玻璃化转变温度（Tg's）和抗弯强度比未进行表面处理的复合材料高出50％，这是因为颗粒与树脂之间的结合更强，这也可以通过断裂表面来证明。还评估了GnP负载浓度和等离子处理时间对纤维增强复合材料拉伸强度的影响。未处理的GnP填料的添加导致强度降低，直至1％的载荷。但是，由于GnP取向效应，较高的负载条件导致20％的改善。断裂表面表明，纤维为GnP提供了一种机制，使其自身平行于纤维轴定向，从而形成了定向的基体微观结构，从而有助于增加裂纹挠度。在所有负载条件下，将这些经过表面处理的GnP掺入这些复合材料后，其抗拉强度比未经处理的系统高出50％。 GnP与基质的键合增加以及GnPs的取向增强，导致多功能复合材料的机械性能得到改善。

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