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Influence of the reaction stoichiometry on the mechanical and thermal properties of SWCNT-modified epoxy composites

机译：反应化学计量对SWCNT改性环氧复合材料的机械和热性能的影响

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Previous studies suggest that carbon nanotubes (CNTs) have a considerable influence on the curing behavior and crosslink density of epoxy resins. This invariably has an important effect on different thermal and mechanical properties of the epoxy network. This work focuses on the important role of the epoxy/hardener mixing ratio on the mechanical and thermal properties of a high temperature aerospace-grade epoxy (MY0510 Araldite as an epoxy and 4,4′-diaminodiphenylsulfone as an aromatic hardener) modified with single-walled carbon nanotubes (SWCNTs). The effects of three different stoichiometries (stoichiometric and off-stoichiometric) on various mechanical and thermal properties (fracture toughness, tensile properties, glass transition temperature) of the epoxy resin and its SWCNT-modified composites were obtained. The results were also supported by Raman spectroscopy and scanning electron microscopy (SEM). For the neat resin, it was found that an epoxy/hardener molar ratio of 1:0.8 provides the best overall properties. In contrast, the pattern in property changes with the reaction stoichiometry was considerably different for composites reinforced with unfunctionalized SWCNTs and reduced SWCNTs. A comparison among composites suggests that a 1:1 molar ratio considerably outperforms the other two ratios examined in this work (1:0.8 and 1:1.1). This composition at 0.2 wt% SWCNT loading provides the highest overall mechanical properties by improving fracture toughness, ultimate tensile strength and ultimate tensile strain of the epoxy resin by 40%, 34%, 54%, respectively.
机译：先前的研究表明，碳纳米管（CNTs）对环氧树脂的固化行为和交联密度有很大影响。这总是会对环氧网络的不同热和机械性能产生重要影响。这项工作着眼于环氧树脂/固化剂混合比对高温航空航天级环氧树脂（MY0510 Araldite作为环氧树脂和4,4'-二氨基二苯砜作为芳香族固化剂）的机械和热性能的重要作用。壁碳纳米管（SWCNT）。获得了三种不同的化学计量比（化学计量比和非化学计量比）对环氧树脂及其SWCNT改性复合材料的各种机械和热性能（断裂韧性，拉伸性能，玻璃化转变温度）的影响。拉曼光谱和扫描电子显微镜（SEM）也支持了该结果。对于纯树脂，发现环氧/硬化剂摩尔比为1：0.8可提供最佳的总体性能。相反，对于用未官能化的SWCNT和还原的SWCNT增强的复合材料，随反应化学计量变化的性质变化模式有很大不同。复合材料之间的比较表明，摩尔比为1：1的性能明显优于本工作中考察的其他两个比率（1：0.8和1：1.1）。该组合物在SWCNT含量为0.2 wt％时，通过将环氧树脂的断裂韧性，极限拉伸强度和极限拉伸应变分别提高40％，34％和54％，从而提供了最高的总体机械性能。

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