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Wax Confinement with Carbon Nanotubes for Phase Changing Epoxy Blends

机译：用碳纳米管对蜡进行封闭，以实现相变环氧共混物

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A paraffin wax was shape stabilized with 10 wt % of carbon nanotubes (CNTs) and dispersed in various concentrations in an epoxy resin to develop a novel blend with thermal energy storage capabilities. Thermogravimetric analysis showed that CNTs improve the thermal stability of paraffin, while differential scanning calorimetry showed that the paraffin kept its ability to melt and crystallize, with enthalpy values almost proportional to the paraffin fraction. In contrast, a noticeable loss of enthalpy was observed for epoxy/wax blends without CNTs, which was mainly attributed to the partial exudation of paraffin out of the epoxy matrix during the curing phase. Dynamic mechanical thermal analysis contributed to elucidate the effects of the melting of the paraffin phase on the viscoelastic properties of the epoxy blends. Flexural elastic modulus and strength of the blends decreased with the wax/CNT content according to a rule of mixtures, while flexural strain at break values deviate positively from it. These results show the potentialities of the investigated epoxy blends for the development of multifunctional structural composites.
机译：用10 wt％的碳纳米管（CNT）稳定石蜡的形状，并以各种浓度分散在环氧树脂中，以开发具有热能存储能力的新型共混物。热重分析表明，碳纳米管改善了石蜡的热稳定性，而差示扫描量热法显示，石蜡保持了其熔融和结晶的能力，其焓值几乎与石蜡分数成正比。相反，对于不含CNT的环氧/蜡共混物，观察到焓显着降低，这主要归因于在固化阶段石蜡从环氧基质中部分渗出。动态机械热分析有助于阐明石蜡相的熔融对环氧共混物的粘弹性的影响。共混物的挠曲弹性模量和强度随蜡/ CNT含量的增加而根据混合物的规则降低，而断裂时的挠曲应变值则与之成正比。这些结果表明了所研究的环氧共混物在开发多功能结构复合材料方面的潜力。

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