Abstract: A telescopic cylinder assembly in automatic reloading system of a toy gun is disclosed. It comprises an external cylinder having an internal space formed therein, an internal cylinder located at the internal space of the external cylinder and configured to be movable in longitudinal direction of the external cylinder, a nozzle at least a part thereof is located inside the internal cylinder and configured to be movable in longitudinal direction of the external cylinder, a nozzle supporter connected to the internal cylinder and configured to support the nozzle, and a cylinder valve configured to open and close a front outlet of the nozzle. The internal space of the external cylinder is expanded primarily in accordance with the movement of the internal cylinder, and the internal space is further expanded secondarily in accordance with the movement of the nozzle.

Abstract: A telescopic cylinder assembly in automatic reloading system of a toy gun is disclosed. It comprises an external cylinder having an internal space formed therein, an internal cylinder located at the internal space of the external cylinder and configured to be movable in longitudinal direction of the external cylinder, a nozzle at least a part thereof is located inside the internal cylinder and configured to be movable in longitudinal direction of the external cylinder, a nozzle supporter connected to the internal cylinder and configured to support the nozzle, and a cylinder valve configured to open and close a front outlet of the nozzle. The internal space of the external cylinder is expanded primarily in accordance with the movement of the internal cylinder, and the internal space is further expanded secondarily in accordance with the movement of the nozzle.

Abstract: Disclosed are nano-sized metals and metal salts stabilized by using semi-telechelic and telechelic polymers prepared through living anionic polymerization, and their synthetic methods, and a nanostructure wherein the nano-sized particles are self-assembled by mixing block copolymers and film-casting. The present invention provides a new method for preparing nano-sized particles capable of easily accomplishing nanostructure by merely mixing, especially with block copolymers, and having excellent stability.

Abstract: The present invention relates to a method of preparing a novel water-soluble and self-doped polyaniline graft copolymer, wherein aniline was grafted onto a poly(styrenesulfonic acid-c-aminostyrene) backbone. The graft copolymer is useful for advanced applications such as electrode manufacture, EMI shielding, static electricity dissipation, metal anti-corrosion, electrochromic materials, sensors, functional film and marine-fouling prevention.

Abstract: The present invention relates to novel water-soluble and self-doped polyaniline graft copolymer, wherein aniline was grafted onto the poly(styrenesulfonic acid-c-aminostyrene), preparation and its preparation. The water-soluble and self-doped conducting polyaniline graft copolymer of the present invention has the merit that water-soluble backbone moieties (sulfonic acid groups), which do not participate in self-doping, make the polymer soluble in water or polar organic solvent such as dimethyl sulfoxide (DMSO). The polymeric dopant (backbone poly(styrenesulfonic acid)) is so structurally stable in wide range of pH that macrophase separation by dopant migration can be prevented and doping/de-doping is reversible.

Abstract: The present invention relates to a process for preparing copolymer hydrogels with controlled molecular weights and having both thermo- and pH-responsive properties, wherein the process comprises the steps of (a) providing sulfonamide type styrenic or (meth)acrylamide-based monomers exhibiting different pKa values; (b) providing poly(N-isopropylacrylamide) or crosslinked poly(N-isopropylacrylamide-co-methylene bisacrylamide) hydrogels having thermo-responsive properties; and (c) providing several hydrogels exhibiting pH-sensitive properties and random or block copolymerizations of the sulfonamide type styrenic or (meth)acrylamide-based monomers prepared in step (a) with N-isopropylacrylamide and/or methylene bisacrylamide monomers used in step (b) in a polar or non-polar solvent; wherein said steps (b) and (c) are carried out by controlled/living radical polymerization using alkyl halides as the initiators and the transition metals with phosphine or amine ligands as the catalysts.

Abstract: Disclosed are nano-sized metals and metal salts stabilized by using semi-telechelic and telechelic polymers prepared through living anionic polymerization, and their synthetic methods, and a nanostructure wherein the nano-sized particles are self-assembled by mixing block copolymers and film-casting. The present invention provides a new method for preparing nano-sized particles capable of easily accomplishing nanostructure by merely mixing, especially with block copolymers, and having excellent stability.

Abstract: The present invention relates to a process for preparing copolymer hydrogels with controlled molecular weights and having both thermo- and pH-responsive properties, wherein the process comprises the steps of (a) providing sulfonamide type styrenic or (meth)acrylamide-based monomers exhibiting different pKa values; (b) providing poly(N-isopropylacrylamide) or crosslinked poly(N-isopropylacrylamide-co-methylene bisacrylamide) hydrogels having thermo-responsive properties; and (c) providing several hydrogels exhibiting pH-sensitive properties and random or block copolymerizations of the sulfonamide type styrenic or (meth)acrylamide-based monomers prepared in step (a) with N-isopropylacrylamide and/or methylene bisacrylamide monomers used in step (b) in a polar or non-polar solvent; wherein said steps (b) and (c) are carried out by controlled/living radical polymerization using alkyl halides as the initiators and the transition metals with phosphine or amine ligands as the catalysts.