The present disclosure belongs to the technical field of lithium-sulfur batteries, and discloses covalent triazine framework polymer nanosheets for cathode materials in lithium-sulfur batteries. The hexaazatriphenylenehexacarbonitrile monomer on the surface of sodium chloride is polymerized through high temperature triazine, sodium chloride crystal is removed to obtain covalent triazine framework polymer nanosheets product, and cathode materials in lithium-sulfur batteries are obtained after melting sulfur. The preparation method of the present disclosure is simple, has low cost, high yield, and uniform structure. The obtained material itself has a porous structure and numerous active sites. When used in lithium-sulfur batteries, it can promote the rapid conversion of lithium polysulfides, effectively suppress the shuttle effect, and improve the rate performance and cycle performance of lithium-sulfur batteries.

The present invention relates to a polymer carbon nitride, a specific crystal form of the polymer carbon nitride, and a cosmetic composition, an ultraviolet ray-blocking composition, and an external use skin preparation composition, which include the polymer carbon nitride. The polymer carbon nitride according to one aspect of the present invention and a crystal form produced by a specific preparation example thereof can absorb both UVA and UVB, and thus can effectively protect the skin from ultraviolet rays while also being non-toxic and thus suitable for living bodies and lacking photoactivity. Therefore, the polymer carbon nitride and the crystal form can be utilized in a cosmetic composition, an ultraviolet ray-blocking composition and an external use skin preparation composition, which are applied to the living body. Moreover, the specific crystal forms of the polymer carbon nitride have different characteristics according to the manufacturing method, and thus may be used in a variety of ways according to the characteristics. Particularly, the crystal form of the polymer carbon nitride according to one aspect can be adjusted to various colors according to the preparation method, and thus can be utilized to obtain a composition having a desired color. Therefore, the crystal form can be suitably utilized to produce products of various colors suitable for the skin tones of individuals.

The present invention relates to a polymer carbon nitride, a specific crystal form of the polymer carbon nitride, and a cosmetic composition, an ultraviolet ray-blocking composition, and an external use skin preparation composition, which include the polymer carbon nitride. The polymer carbon nitride according to one aspect of the present invention and a crystal form produced by a specific preparation example thereof can absorb both UVA and UVB, and thus can effectively protect the skin from ultraviolet rays while also being non-toxic and thus suitable for living bodies and lacking photoactivity. Therefore, the polymer carbon nitride and the crystal form can be utilized in a cosmetic composition, an ultraviolet ray-blocking composition and an external use skin preparation composition, which are applied to the living body. Moreover, the specific crystal forms of the polymer carbon nitride have different characteristics according to the manufacturing method, and thus may be used in a variety of ways according to the characteristics. Particularly, the crystal form of the polymer carbon nitride according to one aspect can be adjusted to various colors according to the preparation method, and thus can be utilized to obtain a composition having a desired color. Therefore, the crystal form can be suitably utilized to produce products of various colors suitable for the skin tones of individuals.

In one aspect, a block copolymer described herein comprises a hydrophilic block including oxazoline monomer or oxazine monomer, and a cationic block comprising monomer including a linear or branched polyamine side chain. In another aspect, a polyion complex comprises a block copolymer comprising a hydrophilic block including oxazoline monomer or oxazine monomer, and a cationic block comprising monomer including a linear or branched cationic polyamine side chain, and a negatively charged biomolecular species associated with the block copolymer. The negatively charged biomolecular species can comprise one or more nucleic acids, such as RNA, DNA, and/or other oligonucleotides.

In one aspect, a block copolymer described herein comprises a hydrophilic block including oxazoline monomer or oxazine monomer, and a cationic block comprising monomer including a linear or branched polyamine side chain. In another aspect, a polyion complex comprises a block copolymer comprising a hydrophilic block including oxazoline monomer or oxazine monomer, and a cationic block comprising monomer including a linear or branched cationic polyamine side chain, and a negatively charged biomolecular species associated with the block copolymer. The negatively charged biomolecular species can comprise one or more nucleic acids, such as RNA, DNA, and/or other oligonucleotides.

The present invention relates to a polymer carbon nitride, a specific crystal form of the polymer carbon nitride, and a cosmetic composition, an ultraviolet ray-blocking composition, and an external use skin preparation composition, which include the polymer carbon nitride. The polymer carbon nitride according to one aspect of the present invention and a crystal form produced by a specific preparation example thereof can absorb both UVA and UVB, and thus can effectively protect the skin from ultraviolet rays while also being non-toxic and thus suitable for living bodies and lacking photoactivity. Therefore, the polymer carbon nitride and the crystal form can be utilized in a cosmetic composition, an ultraviolet ray-blocking composition and an external use skin preparation composition, which are applied to the living body. Moreover, the specific crystal forms of the polymer carbon nitride have different characteristics according to the manufacturing method, and thus may be used in a variety of ways according to the characteristics. Particularly, the crystal form of the polymer carbon nitride according to one aspect can be adjusted to various colors according to the preparation method, and thus can be utilized to obtain a composition having a desired color. Therefore, the crystal form can be suitably utilized to produce products of various colors suitable for the skin tones of individuals.

The present invention relates to a polymer carbon nitride, a specific crystal form of the polymer carbon nitride, and a cosmetic composition, an ultraviolet ray-blocking composition, and an external use skin preparation composition, which include the polymer carbon nitride. The polymer carbon nitride according to one aspect of the present invention and a crystal form produced by a specific preparation example thereof can absorb both UVA and UVB, and thus can effectively protect the skin from ultraviolet rays while also being non-toxic and thus suitable for living bodies and lacking photoactivity. Therefore, the polymer carbon nitride and the crystal form can be utilized in a cosmetic composition, an ultraviolet ray-blocking composition and an external use skin preparation composition, which are applied to the living body. Moreover, the specific crystal forms of the polymer carbon nitride have different characteristics according to the manufacturing method, and thus may be used in a variety of ways according to the characteristics. Particularly, the crystal form of the polymer carbon nitride according to one aspect can be adjusted to various colors according to the preparation method, and thus can be utilized to obtain a composition having a desired color. Therefore, the crystal form can be suitably utilized to produce products of various colors suitable for the skin tones of individuals.