Abstract: Provided is a lithium secondary battery including a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material comprising lithium iron phosphate particles, and the positive electrode has a loading amount of 450 mg/25 cm2 to 740 mg/25 cm2, and the non-aqueous electrolyte includes a lithium salt, an organic solvent, and an additive, wherein the organic solvent includes ethylene carbonate, and dimethyl carbonate, and the dimethyl carbonate is included in 5 vol % to 75 vol % in the organic solvent, and the additive contains vinylene carbonate, and the weight ratio of the vinylene carbonate to the dimethyl carbonate is greater than 0 to 0.2 or less.

Abstract: A composition for preparing an electro-optic material including a first polyimide having a high molecular weight, and a second polyimide having a lower molecular weight and including a structural unit including a chromophore functional group in the side chain, an electro-optic material including the composition, an electro-optic device including the electro-optic material, and a method of preparing the electro-optic material.

Abstract: Disclosed are a near-infrared absorbing composition, an optical structure, and a camera module and an electronic device including the same, wherein the near-infrared absorbing composition includes a copper complex represented by Chemical Formula 1: (L1)-Cu-(L2)n??[Chemical Formula 1] Wherein in Chemical Formula 1, L1, L2, and n are described in the detailed description.

Abstract: A film including a polyimide-polybenzoxazole copolymer including a repeating unit represented by Chemical Formula 1: wherein in Chemical Formula 1, A1, A1?, A2, A3, m, and n are the same as described in the specification.

Abstract: Disclosed are a near-infrared absorbing film including a polymer film, a first near-infrared absorbing layer and a second near-infrared absorbing layer on the polymer film. The first near-infrared absorbing layer may be configured to transmit light in a visible region and to selectively absorb at least one part of light in a near-infrared region. The second near-infrared absorbing layer may be disposed on a surface of the first near-infrared absorbing layer. The first near-infrared absorbing layer may include a dye represented by Chemical Formula 1. The second near-infrared absorbing layer may include a copper complex compound. An optical filter may include the near-infrared absorbing film. An electronic device may include the optical filter. In Chemical Formula 1, R1 to R12 are described in the detailed description.

Abstract: A composition for preparing a nonlinear optic material including an organic chromophore that is polarized by an electric field, a precursor that can form an inorganic material polymer by a sol-gel reaction, and a compatibilizer that can bind to both the organic chromophore and the inorganic material polymer, wherein the organic chromophore includes a functional group at a terminal end that can bind to both the inorganic material polymer and the compatibilizer, a nonlinear optic material prepared from the composition, a method of preparing the nonlinear optic material, and an electro-optic device including the nonlinear optic material are disclosed.

Abstract: A composition for preparing an electro-optic material including a first polyimide having a high molecular weight, and a second polyimide having a lower molecular weight and including a structural unit including a chromophore functional group in the side chain, an electro-optic material including the composition, an electro-optic device including the electro-optic material, and a method of preparing the electro-optic material.

Abstract: A poly(imide-amide) copolymer or its precursor includes two ends and a main chain located between the two ends, and includes a group represented by Chemical Formula 1 at one end, and a structural unit represented by Chemical Formula 7, and at least one of a structural unit represented by Chemical Formula 2 or a structural unit represented by Chemical Formula 3 in the main chain: wherein, in Chemical Formulae 1, 2, 3, and 7, R1 and Ar1 to Ar4 are the same as defined in the detailed description.

Abstract: Disclosed are a near-infrared absorbing composition, an optical structure, and a camera module and an electronic device including the same. The near-infrared absorbing composition includes a copper complex represented by Chemical Formula 1. (L1)-Cu-(L2)n ??[Chemical Formula 1] Definitions of Chemical Formula 1 are described in the detailed description.

Abstract: Disclosed are a near-infrared absorbing film including a polymer film, a first near-infrared absorbing layer and a second near-infrared absorbing layer on the polymer film. The first near-infrared absorbing layer may be configured to transmit light in a visible region and to selectively absorb at least one part of light in a near-infrared region. The second near-infrared absorbing layer may be disposed on a surface of the first near-infrared absorbing layer. The first near-infrared absorbing layer may include a dye represented by Chemical Formula 1. The second near-infrared absorbing layer may include a copper complex compound. An optical filter may include the near-infrared absorbing film. An electronic device may include the optical filter. In Chemical Formula 1, R1 to R12 are described in the detailed description.

Abstract: The present invention provides a composition for preventing, improving or treating periodontal diseases comprising extract of mangosteen. The composition of the present invention has excellent anti-bacterial and anti-inflammatory effects against bacteria inducing periodontal diseases as comprising extract of mangosteen, or alpha-mangosteen or gamma-mangosteen derived from thereof, and thereby it can be widely used for medicines and foods for preventing, improving or treating periodontal diseases.

Abstract: A poly(amide-imide) block copolymer that includes: a first segment including a structural unit represented by Chemical Formula 1C, and a second segment including a structural unit represented by Chemical Formula 2: In Chemical Formula 1C and Chemical Formula 2, R5 to R13, and n3 to n8 are the same as in the specification.

Abstract: The present invention provides a composition for preventing, improving or treating periodontal diseases comprising extract of mangosteen. The composition of the present invention has excellent anti-bacterial and anti-inflammatory effects against bacteria inducing periodontal diseases as comprising extract of mangosteen, or alpha-mangosteen or gamma-mangosteen derived from thereof, and thereby it can be widely used for medicines and foods for preventing, improving or treating periodontal diseases.

Abstract: A material for an optical film including a compound represented by Chemical Formula 1; a polymer including a repeating unit represented by Chemical Formula 10; a polymer including a repeating unit represented by Chemical Formula 20 and a repeating unit represented by Chemical Formula 21; an article prepared by using the polymer; and a display device including the article:

Abstract: An article including a polymer element including a polymer, and inorganic particles having a concentration gradient which decreases in concentration from at least one surface of the polymer element to the inside thereof, wherein the inorganic particles have a refractive index that is greater than or equal to the refractive index of air and less than the refractive index of the polymer.

Abstract: A composition including a diamine compound and a dianhydride compound, wherein the diamine compound includes a first diamine compound represented by Chemical Formula 1, wherein, in Chemical Formula 1, T1 to T8 and L1 to L8 are the same as defined in the detailed description.

Abstract: A poly(amide-imide) block copolymer that includes: a first segment including a structural unit represented by Chemical Formula 1C, and a second segment including a structural unit represented by Chemical Formula 2: In Chemical Formula 1C and Chemical Formula 2, R5 to R13, and n3 to n8 are the same as in the specification.

Abstract: A film including a polyimide-polybenzoxazole copolymer including a repeating unit represented by Chemical Formula 1: wherein in Chemical Formula 1, A1, A1?, A2, A3, m, and n are the same as described in the specification.

Abstract: A poly(amide-imide) block copolymer that includes: a first segment including a repeating unit represented by Chemical Formula 1A, a repeating unit represented by Chemical Formula 1B, a repeating unit represented by Chemical Formula 1C, or a combination thereof; and a second segment including a repeating unit represented by Chemical Formula 2:

Abstract: A poly(amide-imide) block copolymer that includes: a first segment including a repeating unit represented by Chemical Formula 1A, a repeating unit represented by Chemical Formula 1B, a repeating unit represented by Chemical Formula 1C, or a combination thereof; and a second segment including a repeating unit represented by Chemical Formula 2: