Abstract:
PURPOSE: A polysulfone-based nanocomposite material, a polysulfone-based nanocomposite material film using the nanocomposite material, a display substrate using the film and a packing material using the film are provided, to improve a gas barrier property. CONSTITUTION: The polysulfone-based nanocomposite material comprises 83-98.9 wt% of a sulfone-based polymer of polysulfone or polyethersulfone; 0.1-7 wt% of a layered silicate; and 1-10 wt% of an organic compatibilizer of low molecular weight polysulfone or polyethersulfone whose terminal is substituted with a hydroxyl group or a C6-C30 long alkyl chain group and which has a number average molecular weight of 2,000-5,000. Preferably the sulfone-based polymer has a molecular weight of 20,000-200,000; and the layered silicate is one selected from montmorillonite, lucentite (synthetic smectite), kaolinite, magadiite, kenyaite, hectorite and vermiculite, or its organized layered silicate.
Abstract:
PURPOSE: A fire-retardant polypropylene resin composition is provided, which improves fire-retardancy, processability, and mechanical properties, therefore can be used for coating fabrics, coating and insulating electric wires, structures, cases of electronic products, and plastic injection, extrusion goods. CONSTITUTION: The fire-retardant polypropylene resin composition contains: 100pts.wt. of a matrix comprising 70-99pts.wt. of a polypropylene resin and 1-30pts.wt. of an olefin-based oligomer containing at least two hydroxy groups, wherein the polypropylene resin has a melt index of 0.5-80g/10min and is a crystalline isotactic propylene homopolymer, an ethylene-propylene block or random copolymer, or a mixture thereof; 10-40pts.wt. of a halogen-based fire-retardant agent; 0.5-10pts.wt. of an organized lamellar silicate as a fire-retardant agent.
Abstract:
PURPOSE: A secondary non-linear optical nano-complex is provided to improve the orientation factor of a secondary non-linear optical molecule and reduce the polarization alleviation phenomenon of an oriented molecule. CONSTITUTION: Liquid phases in which a secondary non-linear optical molecule is dissolved are divided each other by a nano-size. The divided liquid phases exist in a matrix solid phase. The secondary non-linear optical molecule which exists in a liquid phase region are crosslinked in an electric field arranged state. The liquid phase has liquid crystalline property.
Abstract:
PURPOSE: Provided is an electroconductive composition which comprises a specific copolymer for maximizing the compatibility of electric wire sheathing and carbon black in a predetermined ratio, and shows further improved heat stability and mechanical property. CONSTITUTION: The electroconductive composition comprises 100 parts by weight waste electric wire sheathing containing 0.1-10 parts by weight metal residual components, 1-30 parts by weight of conductive carbon black, and 0-20 parts by weight of ethylene copolymer having ester, acetate or acryl group as a side chain group. The waste electric wire sheathing is substituted with new thermoplastic resin in the range of 0-30 parts by weight.
Abstract:
본 발명은 폴리카보네이트 수지의 제조방법에 관한 것으로서, 더욱 상세하게는 방향족 디히드록시 화합물과 디아릴카보네이트를 용융중합하여 폴리카보네이트 수지를 제조함에 있어, 상기한 용융중합을 산소(O) 또는 황(S)의 비공유전자쌍을 함유하는 화합물과 알칼리 금속 또는 알칼리 토금속의 염화합물이 일정 함량비로 혼합되어 있는 혼합촉매하에서 수행하므로써 반응속도를 크게 향상시켜 낮은 반응온도 조건하에서도 점도평균분자량 15,000 g/mole 이상의 폴리카보네이트 수지 합성이 가능하게 되고, 또한 폴리카보네이트 수지에서 문제시되어온 황변 현상이 전혀 관측되지 않는 고품질의 폴리카보네이트 수지의 제조방법에 관한 것이다.
Abstract:
PURPOSE: A method for preparing polyimide foam is provided, which is widely applicable to insulating materials, sound absorbing materials and cushion materials and has good heat-proof property and fire-retardancy. CONSTITUTION: The method comprises steps of: (i) preparing polyimide precursor by adding diatomic amine having a same equivalent of the aromatic carboxylic acid or the acid anhydride thereof or a mixture thereof, one catalyst selected from the group consisting of isoquinoline, quinoline, imidazole, 1-methylimidazole, 2-methylimidazole and 4-methylimidazole and foaming agent to aromatic ester solution prepared by reacting aromatic carboxylic acid or acid anhydride thereof with an excessive amount of alicyclic monohydric alcohol; (ii) after pre-heating the particulate polyimide precursor, heating the polyimide precursor by radiating the microwave to partly imidize the polyimide precursor; and (iii) post-hardening the product of the step (ii) at high temperature.