共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
采用Hummers法制备氧化石墨烯,并通过上浆剂对碳纤维进行了表面修饰,制备不同处理方式的碳纤维增强环氧树脂基复合材料。结果表明:经过上浆处理后试样的后加工性能得到一定程度改善,而氧化石墨烯会在一定程度上增加碳纤维试样的粗糙度和硬挺度。经过不同处理后的碳纤维增强环氧树脂复合材料的层间剪切强度相对除浆碳纤维d-CF增强环氧树脂复合材料要大,且小尺寸氧化石墨烯上浆处理的碳纤维增强环氧树脂复合材料的层间剪切强度最大(47.50 MPa),其耐磨性为2 049次、毛丝量为4.9 mg、硬挺度为66 mm,适宜于在景观设计中应用。 相似文献
4.
《玻璃钢/复合材料》2021,(5)
制备了国产CCF800H碳纤维增强环氧树脂基复合材料,通过调控环氧树脂中的热塑性树脂增韧剂含量,探索增韧剂含量对树脂浇注体拉伸弹性模量的影响规律,并进一步研究增韧剂含量对碳纤维增强环氧树脂基复合材料纵向压缩性能的影响。结果表明,随着树脂基体中增韧剂含量的升高,环氧树脂浇注体拉伸弹性模量降低,其对应碳纤维增强复合材料单向层合板泊松比升高。增韧剂含量对单向复合材料压缩模量的影响不明显,但复合材料纵向压缩强度会随着增韧剂含量的升高而降低。 相似文献
5.
6.
7.
用3D编织方法及2.5D编织方法制备出碳纤维增强环氧树脂基复合材料,并采用扫描电镜、硬度计、电阻测量仪进行表征。研究发现:随着复合材料编织密度的增加,复合材料的硬度、电导率变大,抗电弧烧蚀性能也随之变好,即运用3D编织的方法制备碳纤维增强环氧树脂基复合材料的抗电弧烧蚀性能比2.5D编织的复合材料的性能更加优良。 相似文献
8.
采用分子动力学模拟手段,构建了碳纤维氧化表面及其增强的环氧树脂基复合材料模型。系统研究了碳纤维表面含氧官能团演变与碳纤维表面张力的作用关系,构建了碳纤维的不同氧化表面增强的环氧树脂模型,并进一步升温固化,获得最终的热固性复合材料。揭示了不同碳纤维表面化学结构对复合材料的剪切、拉伸及弯曲性能的影响。研究结果表明:—C=O和—COOH的含量提升有利于碳纤维表面能的提高,这主要归因于—C=O双键可弥补—C=C—破坏损失的表面共价键能,也提高了表面非键相互作用能。此外,一定含量含氧官能团的引入对复合材料力学性能均有不同程度的提高,但过量的含氧基团则削弱了力学性能。当电流密度为0.69 A/m2时,对应碳纤维增强环氧树脂基复合材料的剪切应力、拉伸强度和弯曲强度均为最优,进一步提升的电流密度使得复合材料的力学强度均逐渐降低。 相似文献
9.
现代竞技体育不断刷新人类的运动极限,给专业体育器材提出了更高的要求,碳纤维增强环氧树脂复合材料是一种热固性高性能复合材料,对碳纤维增强环氧树脂材料在自行车、网球、羽毛球和曲棍球中的应用进行了分析。结果表明,采用碳纤维增强环氧树脂复合材料制造的运动器材的性能得到了极大的提升,在热性能、界面性能、力学性能和抗疲劳性能方面都有显著的效果。碳纤维增强环氧复合材料被广泛用于体育器材的改进,对促进竞技体育的进一步发展具有良好的前景和巨大的潜力。 相似文献
10.
11.
12.
T. Vladimiroff Y. P. Carignan D. S. Chiu A. K. Macpherson 《Propellants, Explosives, Pyrotechnics》1994,19(6):281-285
In the past, real gas effects on the flame temperature were evaluated using the virial equation of state. Usually, the virial expansion was truncated after the third term. In this work the equation of state for dense gases proposed by Haar and Shenker is considered. The implementation developed for H2O, CO, CO2, H2, and N2 by Powell, Wilmot, Haar and Klein is used. The contribution of all minor species is assumed to be approximated by a Lennard-Jones gas with ϵ/k = 100 K and σ = 3.0 Å. It is found that the more conventional approach is valid up to a loading density of 0.2 g/cm3. As density increases real gas effects cause the calculated flame temperature to decrease and the calculated pressure to increase. A computer program to perform the calculations has been devised for a personal computer. 相似文献
13.
14.
15.
16.
17.
Room Temperature curing compositions of epoxy resins with high temperature service capability (95-120°C) were formulated and evaluated. The compositions were based on selected high functionality atomatic epoxy polymers and multicomponent poly amine curing agent systems. Toughening was achieved by addition of a rubbery phase either by prereaction of the epoxy resin with carboxyl terminated (CTBN) or by amine terminated (ATBN) poly butadiene acrylonitrile. The latter elastomeric component served as a part of the poly amine curing agent.
Best results were achieved with an adhesive formulation comprising tetra glycidyl-4-4'-diaminodiphenylmethane (TGDDM) and triglycidyl ether of p-aminophenol with triethylenetetramine and addition of ATBN with a felt carrier.
Lap shear strengths of aluminum/aluminum specimens primed by silane coupling agent in the order of 22 MPa at 25°C and 11 MPa at 120°C with T-Peel strengths of 1.6N/mm at 25°C and 0.52 N/mm at 120°C, were obtained.
The thermal behaviour and transitions, the chemical and mechanical properties, the microstructure and morphology of the selected adhesive formulation were studied, using DSC, Gehman, FTIR, mechanical testing and SEM analysis, respectively.
Experimental results showed that the selected compositions could develop good high temperature (120°C) properties while cured at room temperature. Furthermore, their high temperature performance compares favorably or even exceeds that of commercially available room-temperature-curing adhesive compounds, and are competitive with elevated temperature cured film adhesives. 相似文献
Best results were achieved with an adhesive formulation comprising tetra glycidyl-4-4'-diaminodiphenylmethane (TGDDM) and triglycidyl ether of p-aminophenol with triethylenetetramine and addition of ATBN with a felt carrier.
Lap shear strengths of aluminum/aluminum specimens primed by silane coupling agent in the order of 22 MPa at 25°C and 11 MPa at 120°C with T-Peel strengths of 1.6N/mm at 25°C and 0.52 N/mm at 120°C, were obtained.
The thermal behaviour and transitions, the chemical and mechanical properties, the microstructure and morphology of the selected adhesive formulation were studied, using DSC, Gehman, FTIR, mechanical testing and SEM analysis, respectively.
Experimental results showed that the selected compositions could develop good high temperature (120°C) properties while cured at room temperature. Furthermore, their high temperature performance compares favorably or even exceeds that of commercially available room-temperature-curing adhesive compounds, and are competitive with elevated temperature cured film adhesives. 相似文献
18.
19.
Temperature Programmed Reduction 总被引:5,自引:0,他引:5
Nicholas W. Hurst Stephen J. Gentry Alan Jones Brian D. McNicol 《Catalysis Reviews》1982,24(2):233-309
The success or otherwise of catalyst preparation or modification depends on the availability of suitable characterization techniques to determine the condition of the catalyst. There are many techniques available for this purpose including x-ray powder diffraction, electron microscopy, photoelectron spectroscopy, and infrared spectroscopy. However, none of these techniques has proved to be wholly reliable or generally applicable to the characterization of catalysts under working conditions. 相似文献