Method of manufacturing an aramid and carbon-nanotube composite fiber

A method of manufacturing an aramid and carbon-nanotube composite fiber, comprising:

• preparing a spinning dope having a lyotropic liquid crystal phase by adding both of an aramid and carbon nanotubes into a super strong acid, wherein the spinning dope only includes the aramid, the carbon nanotubes, and the super strong acid;
• and
• manufacturing a composite fiber by spinning the spinning dope, wherein the composite fiber is manufactured by spinning the spinning dope at 10° C. to 150° C.,
• wherein the step of adding both of the aramid and the carbon nanotubes into the super strong acid enables to simultaneously control a π bonding force between the carbon nanotubes and the aramid to have the lyotropic liquid crystal phase,
• wherein the carbon nanotubes have
• an amount of 11 parts by weight to 900 parts by weight based on 100 parts by weight of the aramid,
• a purity of 80% or more, and
• an IG/ID of 30 or more,
• wherein the amount, the purity, and the IG/ID of the carbon nanotubes and the π bonding force between the carbon nanotubes and the aramid control an orientation of the lyotropic liquid crystal phase.