Abstract: A poly(amide-imide) block copolymer that includes a first segment including a repeating unit represented by the following Chemical Formula 1 and a second segment including a repeating unit represented by the following Chemical Formula 2: wherein, R1 to R8, and n1 to n5, in Chemical Formula 1 and 2, are defined herein.

Abstract: A poly(imide-amide) copolymer including a structural unit represented by Chemical Formula 1, a structural unit represented by Chemical Formula 2, and a structural unit represented by Chemical Formula 3: wherein substituents, groups and variables in Chemical Formulae 1 to 3 are as defined in the specification.

Abstract: A poly(imide-amide) copolymer, which is a product of a reaction between a diamine and a dianhydride, wherein the diamine comprises a diamine represented by Chemical Formula 1 and the dianhydride comprises a dianhydride represented by Chemical Formula 5: wherein, the variables in Chemical Formulae 1 and 5 are described in the specification.

Abstract: A composition including a plurality of oligomers including at least one selected from a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, and a combination thereof; and at least one selected from a repeating unit represented by Chemical Formula 3, a repeating unit represented by Chemical Formula 3A, and a combination thereof; wherein at least a part of the plurality of oligomers includes at least one terminal end having an amino group, and wherein at least a part of the plurality of oligomers including at least one terminal end having an amino group is a diamine having a pKa value of equal to or less than 3 at 25° C.: wherein the variables in Chemical Formulae 1, 2, 3, and 3A are described in the specification.

Abstract: Provided are a polyamide combination that includes: a first polyamide including a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, or a combination thereof; and a second polyamide including a repeating unit represented by Chemical Formula 3, and a film prepared using the polyamide combination.

Abstract: Disclosed is a thermosetting resin composition including a thermosetting aromatic oligomer represented by the following Chemical Formula 1, a hollow particle, and solvent, and a board comprising the same. In the above Chemical Formula 1, wherein B, L1, L2, Z1 and Z2 are the same as in defined in the specification.

Abstract: A polyamide block copolymer that includes a first segment including a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, or a combination thereof; and a second segment including a repeating unit represented by Chemical Formula 3. The variables R1 to R15, and n1 to n8 are defined herein.

Abstract: A draw press device may include a lower mold having a lower surface forming portion, a blank holder disposed outside the lower mold, an upper mold having an upper surface forming portion disposed at an upper side slider above an upper side of the lower mold, and a stretching forming portion that performs a stretching when both end portions of the material panel are grasped by a cam operation before shaping or pressing the material panel.

Abstract: A thermosetting composition including an organic solvent, a liquid crystalline thermoset oligomer, and either a crosslinking agent or an epoxy resin or both is disclosed. A printed circuit board which includes the thermosetting composition is also disclosed. The printed circuit board is produced by impregnating the thermosetting composition into a reinforcing material.

Abstract: An electronic device is provided. The electronic device includes a display module, a support plate on which the display module is disposed, and a plurality of openings which are disposed along an outer circumference of the support plate and which reduce vibration transmitted to the display module through the support plate, wherein the vibration is caused by a shock generated in an outer side of the electronic device.

Abstract: Disclosed herein is a hot stamping device for forming, cooling and trimming a material heated to a set temperature including a lower stanchion having a lower mold steel formed to a shape corresponding to a bottom surface of the material and a blank holder vertically movable on an exterior of the lower mold steel; a lower trimming steel mounted on the blank holder, configured to support the edges of the material; an upper stanchion having an upper mold steel formed to a shape corresponding to an upper surface of the material, and configured to move the upper mold steel up and down; an upper trimming steel disposed on an exterior of the upper mold steel move downwardly with the lower trimming steel to trim the edges of the material; and a cooling unit disposed on to the lower and the upper mold steels and the lower and the upper trimming steels, and configured to circulate coolant.

Abstract: Disclosed is a polyimide composition including a copolymer including first and/or second repeating unit including an imide repeating unit, or an amic acid repeating unit to form an imide repeating unit through imidization, and a third repeating unit including an amid repeating unit, wherein at least one terminal end of the copolymer is substituted with a substituted or unsubstituted siloxane or silanol group; and an inorganic particle or a precursor thereof.

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: A composition, including a liquid crystal polymer or oligomer having a terminal hydroxyl group, and a cross-linking agent including a bismaleimide compound, an epoxy resin or a combination thereof, wherein the liquid crystal polymer or oligomer is represented by Formula 1: Z1—(R1)m—(R2)n—Z2??(1), wherein R1 is represented by Formula 2: —X1—Ar1—Y1—??(2), wherein X1 and Y1 are each independently selected from the group consisting of O, CO and NR?, in which R? is independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted C1-C20 alkyl group, and a substituted or unsubstituted C6-C30 aryl group, and Ar1 includes at least one divalent aromatic or alicyclic organic group selected from the group consisting of Formula 3:

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: Disclosed herein is a crosslinkable thermoset monomer. The crosslinkable thermoset monomer has acetylene groups as crosslinking groups introduced at both ends of the backbone. Also disclosed herein is a composition for producing a printed circuit board which comprises the crosslinkable thermoset monomer. The composition exhibits excellent mechanical and thermal properties. Therefore, the composition can be used as a material for next-generation boards that are becoming lighter in weight and smaller in size and thickness. Also disclosed herein is a printed circuit board using the composition.

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 polyamide block copolymer that includes a first segment including a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, or a combination thereof; and a second segment including a repeating unit represented by Chemical Formula 3. The variables R1 to R15, and n1 to n8 are defined herein.

Abstract: A flash memory management method is provided. According to the method, when a request to write the predetermined data to a page to which data has been written is made, the predetermined data is written to a log block corresponding to a data block containing the page. When a request to write the predetermined data to the page again is received, the predetermined data is written to an empty free page in the log block. Even if the same page is requested to be continuously written to, the management method allows this to be processed in one log block, thereby improving the effectiveness in the use of flash memory resources.

Abstract: A flash memory management method is provided. According to the method, when a request to write the predetermined data to a page to which data has been written is made, the predetermined data is written to a log block corresponding to a data block containing the page. When a request to write the predetermined data to the page again is received, the predetermined data is written to an empty free page in the log block. Even if the same page is requested to be continuously written to, the management method allows this to be processed in one log block, thereby improving the effectiveness in the use of flash memory resources.