• Title, Summary, Keyword: Functional silane

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The Study of Water Stability of MDF Cement Composite by Addition of Silane Coupling Agent (Silane Coupling Agent 첨가에 의한 MDF Cement Composite의 수분안정성 연구)

  • 노준석;김진태;박춘근;오복진;최상홀
    • Journal of the Korean Ceramic Society
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    • v.35 no.5
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    • pp.421-428
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    • 1998
  • The effect of silane coupling agents on the water stability of HAC/PVA based MDF cement composites which were modified with urethane and epoxy resin were studied as a function of the functional groups and addition amount of silane coupling agent. According to the composition of polymer matrix the silanes with different functional groups showed the different effectiveness. In case of the only PVA matrix the silane with vinyl functional group was more effective than other silanes. When the epoxy resin was added the silane of epoxy-methodxy group enhanced the flexural strength of dry and wet state more than other. In case of urethane-added MDF cement the silane of diamine group was effective and enhanced the water sta-bility fo MDF cement composite more and more as the addition amount of silane increased, Especially in case of warm-presed composite the effect of silane was enhanced By addition of 2wt% of silane with 야-amine group the flexural strength of urethane-added composites were enhanced by 20% more in dry state 40-70% in wet state in accord with the porosity analysis. The flexural strength of the poxy resin-added MDF cement composite was increased by addition of 1wt% and 2wt% silane of epoxy-methoxy group However the addition of 4wt% of silane decreased the flexural strength of dry and wet state by formation of closed pore in the polymer matrix.

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Improvement of Mechanical Interfacial Properties of Silica/Rubber Composites by Silane Coupling Agent Treatment (실란 커플링제를 이용한 실리카/고무 복합재료의 기계적 계면 물성의 향상)

  • Park, Soo-Jin;Cho, Ki-Sook;Lee, Jae-Rock
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.121-124
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    • 2001
  • Surface-modified silica holds considerable promise in the development of advanced materials for good mechanical properties and stability. In this work, the surface and mechanical interfacial properties of silicas treated with silane coupling agents, such as Y-methacryloxy propyl trimethoxy silane (MPS). Y-glycidoxy propyl trimethoxy silane (GPS), and Y-mercapto propyl trimethoxy silane (MCPS), are investigated. The effect of silane surface treatments of silica on the surface properties and surface energetics are studied in terms of surface functional values and contact angle measurements. And their mechanical interfacial properties of the silica/rubber composites are studied by the composite tearing energy ($G_{IIIC}$). As a result. the mechanical interfacial properties are improved in the case of silane-treated composites compared with untreated one. It reveals that the functional groups on silica surface by silane surface treatments play an important role in improving the degree of adhesion at interfaces in a silica-filled rubber system.

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Swellable Submicrospheres of Ionic Palladium(II) Complexes Containing Decylmethylbis(m-pyridyl)silane

  • Ryu, Yoon-Kyong;Kim, Cho-Rong;Kim, Chi-Won;Noh, Tae-Hwan;Jung, Ok-Sang
    • Bulletin of the Korean Chemical Society
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    • v.30 no.10
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    • pp.2338-2340
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    • 2009
  • Ionic palladium(II) complex containing a long aliphatic chain, [(tmeda)$PdL]_2(PF_6)_4$ (tmeda = N,N,N',N'-tetramethylethylenediamine; L = decylmethylbis(m-pyridyl)silane) allowed to form a puckered submicrosphere morphology without any template or additive. The puckered spheres reversibly adsorb and desorb dioxane molecules. Coligand and cosolvent effects on the formation of submicrospherical morphology were observed.

The Adhesion Promotion of Glass Fiber Reinforced Composite Using Methacrylate Functional Silanes (메타아크릴레이트 실란을 이용한 유리섬유 강화복합재료의 물성향상)

  • Jang, Jyong-Sik
    • Applied Chemistry for Engineering
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    • v.1 no.2
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    • pp.133-139
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    • 1990
  • Methacrylate functional silanes with different methylene spacer groups have been synthesized and the orientation effect and absorption behavior of these silane coupling agent were investigated by Fourier transform infrared spectroscopy(FT-IR). The mechanical properties of glass bead/polyester composites are found to be dependent on the spacer group of treated silane coupling agent. The absorption rate of the silane coupling agent onto the fumed silica surface decreases with increasing the number of the methylene spacer in methacrylate functional silanes. Silane molecules containing long spacer groups are adsorbed onto silica slightly bowed with respect to the substrate surface. The relationship between silane molecular structure and mechanical properties of polymer composites is also investigated in order to improve hot/wet properties of glass fiber/polyester composites.

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Filler-Elastomer Interactions 5. Effect of Silane Surface Treatment on Interfacial Adhesion of Silica/Rubber Composites (충전재-탄성체 상호작용 5. 실란 표면처리가 실리카/고무 복합재료의 계면 특성에 미치는 영향)

  • 박수진;조기숙
    • Polymer Korea
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    • v.26 no.4
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    • pp.445-451
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    • 2002
  • In this work, the adsorption characteristics and mechanical interfacial properties of treated silicas by silane coupling agents, such as, ${\gamma}$-methacryloxy propyl trimethoxy silane (MPS), ${\gamma}$-glycidoxy propyl trimethoxy silane (GPS), and ${\gamma}$-mercapto propyl trimethoxy silane (MCPS), were investigated. The equilibrium spreading pressure ($pi_e$), surface free energy ($gamma_s$ s/), and specific surface area ($S_{BET}$) were studied by the BET method with $N_2$/77 K adsorption. The developments of nonpolar functional groups of the silica surfaces treated by silane coupling agents led to the increase in the $S_{BET}$, $pi_e$, and $gamma_s$, resulting in the improved tearing energy ($G_{mc}$)of the silica/rubber composites. The composites treated by MPS showed the superior mechanical interfacial properties in these systems. These results explained by changing of crystalline size, dispersion, agglomerate, and surface functional group of silica/rubber composites.

Preparation and Properties of Silicone Hydrogel Material Containing Silane Group with Cobalt Oxide Nanoparticles through Thermal Polymerization

  • Lee, Min-Jae;Kong, Ki-Oh;Sung, A-Young
    • Korean Journal of Materials Research
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    • v.30 no.6
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    • pp.273-278
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    • 2020
  • This research is conducted to analyze the compatibility of used monomers and produce the high functional hydrogel ophthalmic polymer containing silane and nanoparticles. VTMS (vinyltrimethoxysilane), TAVS [Triacetoxy(vinyl)silane] and cobalt oxide nanoparticles are used as additives for the basic combination of SilM (silicone monomer), MMA (methyl methacrylate) and MA (methyl acrylate). Also, the materials are copolymerized with EGDMA (ethylene glycol dimethacrylate) as cross-linking agent, AIBN (thermal polymerization initiator) as the initiator. It is judged that the lenses of all combinations are optically excellent and thus have good compatibility. Measurement of the optical and physical characteristics of the manufactured hydrophilic ophthalmic polymer are different in each case. Especially for TAVS, the addition of cobalt oxide nanoparticles increases the oxygen permeability. These materials are considered to create synergy, so they can be used in functional hydrogel ophthalmic lenses.

Overview of Hydrolysis : A Review Part II- Hydrolysis Application

  • Kim, Kwang-Jea
    • Elastomers and Composites
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    • v.55 no.2
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    • pp.137-146
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    • 2020
  • Part 1 provides a theoretical introduction of the hydrolysis mechanism, while Part 2 introduces other types of reaction mechanisms after hydrolysis in elastomer and PA66 composites. We reviewed the condensation reaction, which occurs after hydrolysis in bi-functional alkoxy silane (TESPD & TESPT), and investigated its effects on the mechanical properties of the composites. We also reviewed activators such as zinc soap, which enhances the mechanical properties of silica-silane-filled elastomer composites. The interaction parameter of silica-silane-filled elastomer composites [αC (alpha C)] were also discussed. The effects of hydrolysis on the mechanical property changes in plastic composites were compared and reviewed.

SPAES/Silicate Hybrid Membranes for High-Temperature and Low-Humidity Proton Exchange Membrane Fuel Cells (고온-저습용 연료전지를 위한 SPAES/Silicate 복합막)

  • So, Soon Yong;Kim, Tae Ho;Kim, Sung Chul;Hong, Young Taik
    • 한국신재생에너지학회:학술대회논문집
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    • pp.147-147
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    • 2010
  • An electrolyte membranes for high temperature/low humidity is a demand for the proton exchange membrane fuel cells (PEMFCs). In this work, we prepared hybrid membranes, which have novel glass content in the hydrophilic and hydrophobic part of sulfonated poly(arylene ether sulfone) (SPAES) by in-situ sol-gel synthesis of various functional silane. The effect of silicate from functional silane content on the proton conductivity, water uptake of the hybrid membranes under high temperature and low humidity was quantitatively identified. The silicate content contributed to the enhancement of not only proton conductivity, but also water retention ability for PEMFCs operation.

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Functional Analysis of Protein Chip Plate Using Silane Carboxylate Surface (실란 카르복실 표면을 사용한 단백질 칩 기판의 기능 분석)

  • 김지현;송예신;윤미영;피재호
    • Journal of the Korean institute of surface engineering
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    • v.37 no.4
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    • pp.215-219
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    • 2004
  • We fabricated protein chip plates coated with silane carboxylate. The silane compound was immobilized by hydrogen bond and/or other chemical bonds on the surface of the plate. The plates were then prepared by binding $Ni^{2+}$ to surfaces terminated with silane carboxylate groups. The carboxylic acid surface was generated by chemical oxidation of the terminal double-bond functions of the silane-deposited layer. The $Ni^{2+}$ ions on the surface reacted readily to His-tagged proteins. A significant increase in His-tagged protein adsorption was achieved on the surface terminated with silane carboxylate with longer alkyl chain, suggesting better availability of these protein chip plates for proteomic studies.

Influence of Silane Coupling Agents on the Interlaminar and Thermal Properties of Woven Glass Fabric/Nylon 6 Composites

  • Donghwan Cho;Yun, Suk-Hyang;Kim, Junkyung;Soonho Lim;Park, Min;Lee, Sang-Soo;Lee, Geon--Woong
    • Macromolecular research
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    • v.12 no.1
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    • pp.119-126
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    • 2004
  • In this study, the influence of silane coupling agents, featuring different organo-functional groups on the interlaminar and thermal properties of woven glass fabric-reinforced nylon 6 composites, has been by means of short-beam shear tests, dynamic mechanical analysis, scanning electron microscopy, and thermogravimetric analysis. The results indicate that the fiber-matrix interfacial characteristics obtained using the different analytical methods agree well with each other. The interlaminar shear strengths (ILSS) of glass fabric/nylon 6 composites sized with various silane coupling agents are significantly improved in comparison with that of the composite sized commercially. ILSS of the composites increases in the order: Z-6076 with chloropropyl groups in the silanes > Z-6030 with methacrylate groups> Z-6020 with diamine groups; this trend is similar to that of results found in an earlier study of interfacial shear strength. The dynamic mechanical properties, the fracture surface observations, and the thermal stability also support the interfacial results. The improvement of the interfacial properties may be ascribed to the different chemical reactivities of the reactive amino end groups of nylon 6 and the organo-functional groups located at the ends of the silane chains, which results from the increased chemical reactivity in order chloropropyl > methacrylate > diamine.