Abstract: The present invention relates to one of energy conversion devices, actuator and a dielectric layer used in the actuator. The present invention provides a polymer blend composition capable of easily controlling the ability of converting electrical energy to mechanical energy, which is prepared by blending a piezoelectric polymer with a flexible elastomeric block copolymer showing an effective miscibility therewith, and a tunable actuator using the same.

Abstract: The present invention relates to a separation membrane for water treatment having high water flux and membrane contamination preventing characteristics, and a manufacturing method thereof. The separation membrane for water treatment according to the present invention includes a nanofiber wherein the separation membrane has a surface electric charge. According to the present invention, a separation membrane for water treatment having high water flux and membrane contamination preventing characteristics, and a manufacturing method thereof may be implemented.

Abstract: A monomer composition for polymerizing a branch-type silsesquioxane polymer is disclosed. The monomer composition includes hydroxy-substituted cyclic siloxane in a solvent, and the hydroxy-substituted cyclic siloxane includes stereoisomers of cyclic siloxane of cis, trans, random and twist structures at controlled ratios. Also disclosed are a branch-type silsesquioxane polymer synthesized by polymerizing the monomer composition for polymerizing a branch-type silsesquioxane polymer, and a method for synthesizing the same. In accordance with the disclosure, the isomers can be isolated stably at desired ratios. The isolated isomers may be polymerized into polymers of various types. Since the polymers exhibit low dielectric property, they may be utilized as low dielectric materials.

Abstract: Disclosed are a method for polymerizing polysilsesquioxane from a trialkoxysiloxane monomer, including: preparing an aqueous organic solution including a trialkoxysiloxane monomer, an organic solvent, water and a catalyst; and selectively preparing a polysilsesquioxane with a cage structure or a polysilsesquioxane with a ladder structure by adjusting the amount of the organic solvent or water in the aqueous organic solution, and a polysilsesquioxane with a cage structure or a polysilsesquioxane with a ladder structure prepared therefrom.

Abstract: Disclosed is a light-emitting material including a polysilsesquioxane having a ladder structure with photoactive groups bonded to a siloxane backbone. In addition to superior heat resistance and mechanical property, the light-emitting material provides improved cotability and film property when prepared into a thin film. Further, it provides higher luminous efficiency than the existing organic-based light-emitting material.

Abstract: The present invention relates to an actuator which is one of the energy conversion devices, and is characterized by improving the ability to convert electrical energy into mechanical energy by way of using a dielectric elastomer composite comprising a filler with an efficient dispersibility. In case of using a conventional resilient dielectric layer, there was a problem in that the operating voltage is high, while advantageously exhibiting a fast response and a high strain.

Abstract: The present invention relates to transparent antistatic films using graphene, and methods for preparing the same. The films include conductive particles comprising a single-layer or multi-layer graphene, and a binder. The films are prepared by dispersing graphene in a solvent to obtain a graphene dispersion; dissolving a curable binder to a solvent to obtain a binder solution; mixing the graphene dispersion, the binder solution and optionally an additive to obtain a coating solution; applying the coating solution onto a substrate and drying the solution to form a coated film; and curing the coated film. According to the present invention, transparent or semitransparent antistatic films having excellent permeability, abrasion resistance, scratch resistance, chemical stability and dimensional stability can be prepared. The films also have superior adhesion to substrates and applicability, and thus may be advantageously applied to rigid or flexible substrates.

Abstract: The present invention relates to a polymer blend composition comprising a dielectric elastomer, an actuator film manufactured using the same, and an actuator comprising the film. The polymer blend composition according to the present invention comprises a block copolymer having excellent compatibility with the dielectric elastomer and excellent dielectric properties, and thus displacement values suitable for the purpose can be obtained by a simple method of adjusting a composition of the polymer blend. Moreover, the film manufactured using the same has high dielectric constant, low dielectric loss and high electromechanical displacement, and thus the film exhibits excellent dielectric properties when it is applied in a dielectric layer for an actuator.

Abstract: The present invention relates to block copolymer electrolyte composite membranes with improved ionic conductivity. The block copolymer electrolyte composite membrane in accordance with an aspect of the present invention can comprise a plate-like inorganic filler as surface-modified with a sulfonic group; and a block copolymer comprising at least one selected from the group consisting of a sulfonic group, a carbonic acid group, and a phosphoric acid group.

Abstract: The present invention relates to one of energy conversion devices, actuator and a dielectric layer used in the actuator. The present invention provides a polymer blend composition capable of easily controlling the ability of converting electrical energy to mechanical energy, which is prepared by blending a piezoelectric polymer with a flexible elastomeric block copolymer showing an effective miscibility therewith, and a tunable actuator using the same.

Abstract: A polyalkylthiophene block copolymer, a conductive composition including the same, a polymer-catalyst complex in which a polyalkylthiophene and a transition metal catalyst are connected, and a method of preparing a conductive block copolymer from the polymer-catalyst complex through a ring-opening metathesis reaction are provided.

Abstract: Disclosed are a low-dielectric-constant thin film prepared from a silsesquioxane polymer matrix as a precursor, the silsesquioxane polymer matrix being a silsesquioxane sol prepared by adding a stereoisomer of a multireactive cyclosiloxane to an alkoxysilane, and a method for preparing the same. The disclosed low-dielectric-constant thin film retains a stable film state even at a curing temperature of ˜500° C. without being decomposed. Also, it exhibits a very uniform surface property with a low surface modulus and has such a superior coatability as to be coatable smoothly with no crack even with a thickness of 500 nm or larger. In addition, the low-dielectric-constant thin film according to the present disclosure may exhibit low dielectric property while having superior surface modulus and hardness.

Abstract: Disclosed is a light-emitting material including a polysilsesquioxane having a ladder structure with photoactive groups bonded to a siloxane backbone. In addition to superior heat resistance and mechanical property, the light-emitting material provides improved cotability and film property when prepared into a thin film. Further, it provides higher luminous efficiency than the existing organic-based light-emitting material.

Abstract: Disclosed are a polysilsesquioxane having a ladder structure with photoactive groups bonded at the siloxane main chain, and a method for preparing the same. Polysilsesquioxanes exhibiting superior thermal and mechanical properties and having various functionalities and characteristics depending on the photoactive groups introduced thereto may be prepared via a relatively simple method. The polysilsesquioxanes may be useful as an industrial material for organic-inorganic hybrid materials.

Abstract: Provided is a method for controlling a self-assembled structure of a poly(3-hexylthiophene)-based block copolymer, including: providing a polymer composition containing a block copolymer having a ?-conjugated poly(3-hexylthiophene) polymer and a non-conjugated polymer introduced thereto, and a solvent; and coating the polymer composition onto a substrate. According to the method disclosed herein, it is possible to control a self-assembled structure of a poly(3-hexylthiophene)-based block copolymer merely by a relatively simple process including coating the poly(3-hexylthiophene)-based block copolymer onto a substrate with a selected solvent. In this manner, it is possible to control the alignment of conductive domains in the block copolymer so that it is suitable for various organic electronic devices.

Abstract: Provided are a multifunctional optical film having light transmission, light diffusion, heat resistance, UV-shielding properties, etc., due to the use of optical silicone resin(s), and showing improved production efficiency based on physical properties (e.g., release property, smoothness) of the silicone resin(s), and a surface light source device and a liquid crystal display employing the optical film.

Abstract: There is provided a novel chain-end functionalized PEO of formulas (I) to (IV) prepared via living anionic polymerization and chain-end functionalization, as well as a simple method of preparing nano-sized transition metal or metal salt particles using the same, which can be readily stabilized even in an aqueous medium. The water-soluble PEO-based polymers having various functional groups (including a drug group such as vitamin and anti-cancer agent) and the process of preparing nano-sized transition metal or metal salt particles using the same can be advantageously used in the development of new materials for drug delivering system and imaging, e.g., a contrast agent and an anti-cancer agent simultaneously.

Abstract: Provided are a multifunctional optical film having light transmission, light diffusion, heat resistance, UV-shielding properties, etc., due to the use of optical silicone resin(s), and showing improved production efficiency based on physical properties (e.g., release property, smoothness) of the silicone resin(s), and a surface light source device and a liquid crystal display employing the optical film.

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: Highly regular and well-defined structured polyorganosilsesquioxane polymer with superior heat resistance, combustion resistance and flexibility, wherein same or different kinds of substituents are bonded alternately, and the preparation method thereof. The polyorganosilsesquioxane prepared according to the present invention has a small molecular weight distribution and a high molecular weight, and is soluble in organic solvents because a three-dimensional network structure is not formed during the preparative condensation polymerization. Polyalkylaromaticsilsesquioxane obtained from the preparing method of the present invention is a useful heat-resistant material. It can be used as a heat-resistant coating agent, a protective coating agent of optical fiber, a coating material for resistor, heat-resistant paint, an adhesive and a releasing agent for precise molding. Also, it can be used for the semiconductor protective layer, interlayer dielectrics for semiconductor integration (e.g.