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本文从环氧树脂的缺点出发,研究了有机/无机纳米复合材料的特点,选用环氧树脂/二氧化硅纳米复合的方法来改善材料的耐热性能、提高材料的韧性,以期获得具有高热稳定性能和韧性的环氧树脂材料。 相似文献
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采用超声分散、机械剪切搅拌和纳米SiO_2粒子表面处理等多种分散工艺,制备了纳米SiO_2/环氧树脂复合材料。采用SEM、电子拉力机、粘弹谱仪和脉冲声管测试系统分别研究了纳米SiO_2/环氧树脂复合材料的微观结构、拉伸性能、动态力学性能和水声性能。结果表明,超声波分散法以及预处理法能够将纳米SiO_2粒子均匀分散在环氧树脂基体中,并且SiO_2粒子呈纳米尺度分布在环氧基体中。相对纯环氧树脂材料,纳米SiO_2/环氧树脂复合材料的拉伸强度提高了5%—30%,伸长率提高了2%—14%;储能模量随纳米SiO_2粒子的加入与均匀分散而提高,损耗因子则略有下降;吸声系数相对纯环氧树脂材料提高了6—10倍;而且纳米SiO_2/环氧树脂复合材料的常规力学性能、动态力学性能以及水声性能受纳米粒子的分散效果影响明显,分散越均匀,变化越大。 相似文献
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采用球磨法在环氧树脂中分散了不同质量分数(0、5wt%和10wt%)的埃洛石纳米管(HNTs),通过哌啶固化剂固化,制备了HNTs/环氧树脂复合材料,并利用纳米压痕法测试了HNTs/环氧树脂复合材料的弹性模量、硬度和蠕变性能。SEM和TEM观测表明:HNTs在环氧树脂中分散情况较好。纳米压痕实验结果表明:在不牺牲HNTs/环氧树脂复合材料弹性模量、硬度以及玻璃化转变温度的基础上,HNTs明显提高了环氧树脂基复合材料的抗蠕变性能,这主要是由于HNTs和环氧基分子链形成了新的交联结构,增加了材料的交联密度,刚性纳米粒子限制了环氧基分子链的活动性。 相似文献
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采用超声波分散的方法制备了纳米碳纤维/环氧树脂复合材料,研究了纳米碳纤维/环氧树脂复合材料在拉伸和弯曲破坏时的电发射现象,并对其电发射机理进行了探讨。研究结果表明:纳米碳纤维/环氧树脂复合材料在受荷开裂和裂纹扩展过程中均存在明显的电发射现象,这一特性将为复合材料结构的在线监测及非损伤诊断提供新的方法和途径。 相似文献
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EP/MMT纳米复合材料的研究 总被引:2,自引:0,他引:2
综述了目前环氧树脂/黏土纳米复合材料的制备方法,介绍了环氧树脂/黏土纳米复合材料的优异性能,并对其增韧改性机理作了探讨,最后展望了环氧树脂纳米复合材料的应用前景。 相似文献
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纳米填料对环氧树脂基底部填充胶性能的影响 总被引:1,自引:0,他引:1
以纳米SiO2,TiO2,Al2O3,ZnO做为填料制备环氧树脂基的底部填充胶,研究了纳米填料对底部填充胶的吸水性、耐热性以及剪切强度的影响。研究表明,添加少量纳米SiO2,Al2O3,ZnO颗粒可以改善填充胶的吸水性能,其中加入3%ZnO纳米颗粒填充胶的吸水率最低。纳米填料的加入可以提高填充胶的剪切强度和耐热性能。综合考虑吸水性、耐热性和剪切强度指标,添加3%的ZnO颗粒可以制备出综合性能良好的底部填充胶。 相似文献
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固化反应程度对热固性聚合物热物理性能的影响 总被引:4,自引:0,他引:4
以示差扫描量热仪(DSC)为主要研究手段,研究了环氧封端聚芳醚酮(E-PEK)、双酚A型环氧树脂(E-44)的玻璃化转变温度(Tg)和比热(Cp)与温度和反应程度的关系。采用基团贡献法对上述材料的Tg和Cp进行了预测,引入端基和固化剂的影响对基团贡献法进行了修正。 相似文献
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The effects of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of epoxy/MWCNT nano-composites were studied with emphasis on fracture toughness under bending and shear loading conditions. Several finite element (FE) analyses were performed to determine appropriate shear loading boundary conditions for a single-edge notch bend specimen (SENB) and an equation was derived for calculating the shear loading fracture toughness from the fracture load. It was seen that the increase in fracture toughness of nano-composite depends on the type of loading. That is to say, the presence of MWCNTs had a greater effect on fracture toughness of nano-composites under shear loading compared with normal loading. To study the fracture mechanisms, several scanning electron microscopy (SEM) pictures were taken from the fracture surfaces. A correlation was found between the characteristics of fracture surface and the mechanical behaviors observed in the fracture tests. 相似文献
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采用5万CiCo-60源进行辐照,制备了乙烯-乙烯醇共聚物TiO2纳米复合材料、SiO2纳米复合材料、ZnO纳米复合材料和有机蒙脱土纳米复合材料。分析了纳米粒子对体系力学性能的影响,研究了辐照剂量、不同基体、不同纳米填料及改性剂等实验条件对体系力学性能的影响。结果表明,以EVOH-68(乙烯醇基含量为68%)为基体的纳米复合材料经过辐照,力学性能明显下降,且下降幅度大。以EVOH-56(乙烯醇基含量为56%)为基体的纳米复合材料经过辐照,在小辐照剂量下力学性能提高,大剂量下力学性能下降,且下降幅度较小。EVOH-56/纳米ZnO体系与EVOH-56/纳米TiO2体系相比表现的更耐辐照。 相似文献
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Xiangfeng Chu Jiulin Wang Jun Zhang Yongping Dong Wenqi Sun Wangbing Zhang Linshan Bai 《Journal of Materials Science》2017,52(16):9441-9451
SnO2/graphene quantum dots (GQDs) nano-composites were prepared via solvothermal method (160 °C, 10 h), in which graphene quantum dots were synthesized from graphene oxide by one-step solvothermal method. The nano-composites were characterized by means of HRTEM, XRD, SEM, FTIR, XPS and N2 adsorption–desorption, respectively. The sensor devices were fabricated using SnO2/GQDs nano-composites as sensing materials. The effect of the GQDs content on the gas-sensing responses and the gas-sensing selectivity was investigated. The experimental results showed that the sensor based on SnO2/GQDs nano-composite (S-2) exhibited good response and good selectivity to acetone vapor. When operating at 275 °C, the responses of the sensor based on SnO2/GQDs nano-composite (S-2) to 1000 and 0.1 ppm acetone reached 120.6 and 1.3, respectively; the response time and the recovery time for 1000 ppm acetone were 17 and 13 s, respectively. 相似文献
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We study the effect of the molecular nature of the interface between an epoxy matrix and multi-walled carbon nanotubes (CNTs) on the mechanical properties of the resultant nano-composites, with emphasis on toughness. A number of samples based on variously functionalized CNTs, namely, pristine, carboxylated, and aminated CNTs are examined, with different qualities of dispersion. Nano-composite toughness is found to increase with enhanced interfacial adhesion, an effect that is opposite to what is usually observed in traditional fiber-based composites. The classical pull-out energy model is shown to effectively explain this result. It is thus possible to tune the toughness of a nano-composite by adjusting the molecular nature of its interface and the CNT characteristics, namely its strength and its length relative to its critical length. 相似文献
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Al2O3/SiO2纳米复合陶瓷型芯材料的制备与性能 总被引:10,自引:1,他引:9
用粉体分散及热压注方法制备了Al2O3/SiO2纳米复合陶瓷型芯材料,研究了Al2O3/SiO2纳米复合陶芯材料的增强机理,SiO2纳米粉在Al2O3微粉基体中较均匀分布,不含纳米粉材料的断裂方式为典型的沿晶断裂,SiO2含量为3%和5%时,为沿晶/穿晶混合断裂,SiO2含量为7%时,以穿晶断裂为主,加入SiO2纳米粉后,复合材料的孔洞减少,致密度增加,致使烧结温度降低,含7%SiO2纳米粉的陶芯强度比不含纳米粉的提高了约4倍,其原因是纳米晶的析出和材料断裂方式的改变。 相似文献