In-situ hydrophobically modified aramid nano aerogel fiber and uses thereof

An in-situ hydrophobically modified aramid nano aerogel, wherein the in-situ hydrophobically modified aramid nano aerogel fiber has a connected three-dimensional porous network structure formed by overlapping grafting modified aramid nano structures having a size of 8 nm-300 nm;

• the connected three-dimensional porous network structure is composed of micropores having a size of less than 2 nm, mesopores having a size of 2-50 nm and macropores having a size of 50 nm-500 μm;
• the connected three-dimensional porous network structure has a porosity of 60%-99% and a specific surface area of 100-1000 m2/g;
• the in-situ hydrophobically modified aramid nano aerogel fiber has a diameter of 10 μm-2 mm and a draw ratio of more than 10;
• the in-situ hydrophobically modified aramid nano aerogel fiber has a heat conductivity of 50 mW/(m·K), a tensile strength of 3-35 Mpa, and an elongation at break of 10-50%;
• the in-situ hydrophobically modified aramid nano aerogel fiber is prepared by a preparation method comprising:
• providing an aramid nano spinning solution;
• preparing a hydrophobically modified aramid nano gel fiber by using a spinning technology, wherein a coagulating bath adopted by the spinning technology comprises a first organic solvent and a halogenated reagent comprising a combination of any one or more than two of monochloroalkane, monochloroalkane, dibromoalkane, dichloroalkane, and trichloroalkane;
• and
• drying the hydrophobically modified aramid nano gel fiber to obtain the in-situ hydrophobically modified aramid nano aerogel fiber.