• 제목/요약/키워드: coupling agents

검색결과 130건 처리시간 0.023초

커플링제로 처리된 질화규소 분말의 사출성형 (Injection Molding of Silicon Nitride Powders Treated with Coupling Agents)

  • 송휴섭
    • 한국세라믹학회지
    • /
    • 제30권2호
    • /
    • pp.131-138
    • /
    • 1993
  • The effects of silane coupling agents on the injection molding process were investigated using silicone nitride mixtrues with a binder system containing polypropylene as a major binder (55vol% solid loading). The formation of bonding between silicon nitride powder and coupling agents was confirmed through the analyses of powder surface. The use of coupling agents improved mixing characteristics judged by the torque change during mixing process. the coupling agents also reduced molten viscosity of the mixture considerably, which is a main factor to determine the flow of the mixture. However, the bonding between coupling agents and polymers had a negative effect on the debinding process by retarding the thermal decomposition.

  • PDF

PVC-Ni 복합재의 전기적 ${\cdot}$ 기계적 성질에 미치는 Titanate Coupling Agent 의 영향 (The Effect of Titanate Coupling Agents on the Electrical and Mechanical Properties of PVC-Ni Composite Systems)

  • 문탁진;이미경;김선호
    • 대한화학회지
    • /
    • 제29권3호
    • /
    • pp.319-327
    • /
    • 1985
  • 충진제의 함량, titanate계 coupling agent의 종류, 처리량에 따른 PVC-Ni 복합재의 전기적.기계적 성질을 연구하였다. coupling agents처리에 의해 충진제의 분산상태가 양호해지고, 충진제 표면의 불순물이 대체되어 복합재의 전기저항은 감소되며 기계적 성질을 연구하였다. coupling agent처리에 의해 충진제의 분산상태가 양호해지고, 충진제 표면의 불순물이 대체되어 복합재의 전기저항은 감소되며 기계적 성질들은 향상되나 과량의 coupling agent의 처리는 이들 효과를 상쇄함을 보였다.

  • PDF

실란 계면 결합제 함량에 따른 XLPE/SXLPE 블렌드의 전기적 성질 (Electrical properties of XLPE/SXLPE blends as a function of silane coupling agent contents)

  • 고정우;서광석
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2000년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마
    • /
    • pp.33-36
    • /
    • 2000
  • Electrical properties of Crosslinked polyethylene/silane crosslinked polyethylene (XLPE/SXLPE) blends were studied. Silane coupling agents of various contents were added to blends and their water tree and electrical breakdown characteristics were investigated. The water tree length of XLPE/SXLPE were increased by the addition of silane coupling agents except the case of SXLPE 10 % containing coupling agents of 0.5, 1.0 phr. AC breadown strength slightly increased by the addition of coupling agents to XLPE/SXLPE blends in cases of SXLPE 20 % containing coupling agents of 2.0 phr and SXLPE 50 %. The tendency of effects on water tree and breakdown characteristics was inverse.

  • PDF

The Effect of Glass Fiber and Coupling Agents in the Blends of Silicone Rubber and Liquid Crystalline Polymers

  • Das T.;Banthia A.K.;Adhikari B.;Jeong Hye-Won;Ha Chang-Sik;Alam S.
    • Macromolecular Research
    • /
    • 제14권3호
    • /
    • pp.261-266
    • /
    • 2006
  • Blends of silicone rubber (VMQ) and liquid crystalline polymer (LCP) were prepared using a melt blending technique in the presence and absence of glass fiber and coupling agents. The effect of glass fiber and coupling agents on the thermal, dynamic mechanical, morphological pro-perties and cure characteristics of VMQ/LCP blends were studied. The vinyl silane coupling agent showed a significant effect on the above mentioned properties of VMQ/LCP blends by reacting at the interface between VMQ and LCP. The viscosity of the VMQ/LCP blends decreased with the addition of a coupling agent. A substantial improvement in storage modulus of VMQ/LCP blends was observed in the presence of glass fiber and coupling agents. However, as a coupling agent vinyl silane proved to be better than amine for the VMQ/LCP-glass-containing blends. The thermal stability of the pure silicone rubber was higher than those of the blends. This high thermal stability of silicone rubber was attributed to the Si-O-Si bonds. However, the thermal stability of the blends decreased further in the presence of a coupling agent, possibly due to a decrease in blend crystallinity.

플라즈마 표면처리에 따른 고분자절연재료용 유리섬유의 표면개질 (Surface Modification of Glass Fiber for Polymer Insulator by Plasma Surface Treatment)

  • 임경범;이덕출
    • 대한전기학회논문지:시스템및제어부문D
    • /
    • 제52권5호
    • /
    • pp.206-206
    • /
    • 2003
  • It is hard to expect excellent electrical, mechanical and chemical properties from most of the composite materials presently used as insulators due to insufficient wettability property caused by the difference of interfacial properties between the matrix material and the reinforcer. Therefore, various interfacial coupling agents have been developed to improve the interfacial properties of composite materials. But if the wettable coupling agents are used outdoor for a long time, change in quality takes place in the coupling agents themselves, bringing about deterioration of the properties of the composite materials. In this study, glass surface was treated by plasma to examine the effect of dry interface treatment without coupling agent. It was identified that the optimum parameters for the best wettability of the samples at the time of generation of plasma were oxygen atmosphere, 0.1 torr of system pressure, 100 W of discharge power, and 3 minutes of discharge time. Also, the surface resistance rate and dielectric property were improved.

플라즈마 표면처리에 따른 고분자절연재료용 유리섬유의 표면개질 (Surface Modification of Glass Fiber for Polymer Insulator by Plasma Surface Treatment)

  • 임경범;이덕출
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제52권5호
    • /
    • pp.206-212
    • /
    • 2003
  • It is hard to expect excellent electrical, mechanical and chemical properties from most of the composite materials presently used as insulators due to insufficient wettability property caused by the difference of interfacial properties between the matrix material and the reinforcer. Therefore, various interfacial coupling agents have been developed to improve the interfacial properties of composite materials. But if the wettable coupling agents are used outdoor for a long time, change in quality takes place in the coupling agents themselves, bringing about deterioration of the properties of the composite materials. In this study, glass surface was treated by plasma to examine the effect of dry interface treatment without coupling agent. It was identified that the optimum parameters for the best wettability of the samples at the time of generation of plasma were oxygen atmosphere, 0.1 torr of system pressure, 100 W of discharge power, and 3 minutes of discharge time. Also, the surface resistance rate and dielectric property were improved.

Comparison of Electrodeposited Carbon Fibers Reinforce Epoxy Composites Using Monomeric and Polymeric Coupling Agents

  • Park, Joung-Man;Kim, Yeong-Min
    • Macromolecular Research
    • /
    • 제8권4호
    • /
    • pp.153-164
    • /
    • 2000
  • By electrodeposition (ED) using a monomeric- and two polymeric coupling agents, the interfacial shear strength (IFSS) of carbon fiber/epoxy composites was investigated by fragmentation test. ED results were compared with the dipping and the untreated cases under dry and wet conditions. Multi-fiber composites (MFC) were used for the direct comparison for the untreated and the treated cases. Various treating conditions including time, concentration and temperature were evaluated, respectively. Under dry and wet conditions ED treatment exhibited much higher IFSS improvement compared to the dipping and the untreated cases. Monomeric- and polymeric coupling agents exhibited the comparative IFSS improvement. Adsorption mechanism between coupling agents and carbon fiber was analyzed in terms of the electrolyte molecular interactions during ED process based on to the chain mobility. The microfailure modes occurring from the fiber break, matrix and interlayer cracks were correlated to IFSS.

  • PDF

Silane Coupling제(劑)와 고분자탄성체간(高分予彈性體間)의 용액반응(溶液反應)에 대한 속도론적(速度論的) 해석(解析) (Kinetic Analysis of Solution Reaction between CR and Silane Coupling Agents)

  • 박영수;윤정식;유종선;백남철
    • Elastomers and Composites
    • /
    • 제25권2호
    • /
    • pp.112-116
    • /
    • 1990
  • In this study, as one way of developing the new cross-linking method that is curable in water, kinetic analysis of solution reaction between CR and silane coupling agents was attemped. First, CR was reacted with silane coupling agents in solution state. According to the time, reaction quantity was pursued by gas chromatography. Also, reaction rate coefficient and activation energy were calculated from the reaction quantity. Silane coupling agents which were used in this study were MPS, CPS and VES.

  • PDF

SBR에 대한 Silane Coupling Agent 처리한 Kaolinite의 보강효과에 관한 연구 (Effect of Kaolinite Treated with Silane Coupling Agent on the Reinforcement of SBR)

  • 김기주;김종석;안병국;최형진;장영재
    • Elastomers and Composites
    • /
    • 제25권4호
    • /
    • pp.280-290
    • /
    • 1990
  • The effect of surface treatment of kaolinite with silane coupling agent on the reinforcement of SBR was investigated. The possibility of the practical use of kaolinite as an organic filler was also scrutinized and it was found that the reinforcement of SBR was improved by modifying surface of the cheap inactive inorganic filler with organic silane coupling agents. 3-Chloropropyltrimethoxysilane(C-series), 3-mercaptopropyltrimethoxysilane(M-series) and 3-aminopropyltriethoxysilane(A-series) were used as coupling agents. To test the material properties of vulcanized and unvulcanized SBR, Mooney viscosity, modulus, elongation and fractured surface measurements by SEM were carried out by changing the amount of silane coupling agents. Torqe of the unvulcanized SBR following the measurement of the degree of vulcanization was to be increased as the amount of silane was increasing, and Mooney viscosity of M-series and A-series was also increased.

  • PDF

실란 커플링제 처리방법이 고무 물성에 미치는 영향 (Influence of Silane Coupling Agent Treatments on Physical Properties of Rubbery Materials)

  • 문진복
    • Elastomers and Composites
    • /
    • 제36권4호
    • /
    • pp.237-245
    • /
    • 2001
  • 고무의 충전제로 사용되는 실리카의 보강효과를 높이기 위해 실란 커플링제인 bistriethox ysilyipropyltetrasulfide(Si 69)와 ${\gamma}$-mercaptopropyltrimethoxy silane(MPS)를 사용하여 실리카의 화학처리를 건식법과 습식법으로 행하였으며, 실란 커플링제를 직접 실리카와 혼합하는 건식법보다 혼합하기 전에 화학적으로 처리하는 건식법이 분산성, 젖음성, 동적특성 및 안정성에서 더욱 우수하였다. 화학처리된 실리카를 SBR 배합에 니더와 믹싱롤을 사용하여 균일하게 혼련하였고 측정한 물성으로부터 비교, 검토하였으며, 실란 커플링제를 사용하지 않을 때보다 물성이 현저히 증가하였으며, 실험으로부터 건식법의 경우 Si 69와 MPS의 최적 사용량은 2 w/w%이지만. 습식법의 경우 EA 및 TGA 분석으로부터 4 w/w% 이였다.

  • PDF