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CNT yarn is made from CNT bundles.But it is so low in tensile strength for the weak Van der Waals force of CNT each other.Therefore we aimed at the strength improvement of CNT yarn by impregnation of the Cardo structure epoxy resin (CP) that the affinity was good for CNT.In addition,we compared the effect of the strength improvement of the CP with the bis-phenol A epoxy (EP) to CNT yarn