Silane Coupling Agent 첨가에 의한 MDF Cement Composite의 수분안정성 연구

노준석,김진태,박춘근,오복진,최상홀 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.5

순수 HAC/PVA 계 및 epoxy 수지와 urethane이 첨가된 HAC/PVA 계 MDF 시멘트 복합재료에 서로 다른 관능기를 갖는 3종류의 silane coupling agent를 첨가하여 강도 및 수분안정성에 대한 영향을 살펴보고 기공율 분석을 통해 미세구조와 강도의 관계를 살펴보았다. Silane의 관능기에 따라 각각의 MDF 시멘트 복합재료의 강도 및 수분안정성 향상에 대한 효과가 다른 것을 알 수 있었다. 순수 PVA 메트릭스의 경우에 대해서는 vinyl 기를 갖는 silane이 효과적인 영향을 나타내었으며 epoxy수지가 첨가된 MDF 시멘트에 대해서는 epoxy-methoxy 기를 갖는 silane이, 그리고 urethane이 첨가된 MDF 시멘트에 대해서는 diamine 기의 silane이 효과적이었다. Silane의 첨가량에 따라서는 urethane이 첨가된 MDF 시멘트 복합재료의 경우, diamine 기의 silane이 많이 첨가될수록 수분안정성이 향상되었으며 특히 2wt%의 silane을 첨가하고 wqrm press를 이용하여 성형하였을 때 건조 강도는 약 20% 향상되었으며 습윤강도는 40~70%까지 크게 향상되었다. 이는 기공율과 밀접한 관계가 있음을 알 수 있었다. Epoxy 수지가 첨가된 MDF 시멘트의 경우에서도 2wt%의 silane 첨가까지는 그 첨갈향이 많아질수록 강도가 향상되는 것을 알 수 있었지만 과량의 silane(4wt%)이 첨가될 경우에서는 오히려 특성저하가 나타났다. 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.

Silane coupling agent인 MPS 농도별처리에 따른 열중합 레진과 자가중합 레진 간의 전단결합강도

최에스더(Esther Choi),권은자(Eun-Ja Kwon) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.2

본 논문은 치과에서 많이 사용되고 있는 silane coupling agent로 표면 처리한 의치상 레진과 자가중합레진 간의 전단 결합력에 미치는 영향에 대해 알아보고자 하였다. 의치상 레진에 silane coupling agent 농도별 표면 처리 후 자가중합레진을 주입하여 전단결합강도를 측정하였다. Silane coupling agent(MPS)의 농도별 표면 처리에 따른 의치상 레진과 자가중합레진 간의 전단결합강도에서는 Vertex self curing resin에서 5%, 7%에서 유의적으로 높게 나타났고(P<0.05), Kooliner에서는 5%에서 유의적으로 가장 높게 나타났다(P<0.05). 따라서 의치상 레진과 자가중합레진 사이에 MPS 5%를 이용한 표면처리가 전단결합강도에 효과적으로 영향을 미치는 것이라 사료된다. The purpose of this study was to evaluate the effect of the surface treatment of widely used in dental of silane coupling agent concentration on the shear bond strength of denture base resin and self curing resins. Denture base resin surface was treated with silane coupling agent concentration, after self curing resins were injected shear bond strength was measured. The results of silane coupling agent(MPS) concentration on the shear bond strength of Vertex self curing resin showed that the value of 5%, 7% groups were higher than that of other group(P<0.05). Silane coupling agent concentration on the shear bond strength of Kooliner resin showed that the value of 5% was highest(P<0.05). Therefore, we could conclude 5% MPS to strengthen effectively the shear bonding property of denture base resin and self curing resins of this study.

리싸이클 PET 부직포의 실리카졸과 실란 커플링제를 이용한 발수성 부여 연구

이선영,이재민,박진원,박정진,권미연,허율,이승구 한국섬유공학회 2023 한국섬유공학회지 Vol.60 No.1

In this study, silica sol and silane coupling agent hexadecyl trimethoxysilane(HDTMS) were used to improve the surface roughness of the recycled PET nonwoven fabricsto impart water repellency of the nonwoven fabrics. The effects of silica sol and silanecoupling agent treatment on the surface morphology, chemical structure, surface roughnessand water repellency of the recycled PET nonwoven fabrics were examined. As resultsof SEM observation, the silica particles showed a uniform distribution on the surface at lowconcentration of silane coupling agent, and with an increase of concentration of silanecoupling agent, more agglomeration of the particles occurred. FT-IR results showed thespecific peaks at 3,000, 1,000 and 791 cm-1 due to the axial deformation of Si-OH, Si-O-Siand Si-C bond, respectively. Surface roughness of recycled PET nonwoven fabrics increasedby treatment with silica sol and silane coupling agent. It is thought to be because silicanano particles generated the micro irregularities on the surface. The water contact anglewas greatly increased to 130o at 0.5% of silane coupling agent. It is thought to be due toreduction of surface free energy of the nonwoven fabrics by treatment with silica sol andsilane coupling agent. It was confirmed that silica sol and silane coupling agent treatmentis an eco-friendly surface modification method that can improve water repellency of nonwovenfabrics efficiently.

화학적 표면처리에 따른 의치상 레진과 이장재 간의 전단 결합강도

최에스더(Choi, Esther),권은자(Kwon, Eun-Ja) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.11

본 논문은 monomer에서 결합증진에 많은 역할을 하는 MMA와 TEGDMA의 농도별 표면 처리와 silane coupling agent로 표면 처리한 것이 의치상 레진과 이장재간의 결합력에 미치는 영향에 대해 알아보고자 하였다. 의치 상 레진에 MMA와 TEGDMA의 농도별 표면 처리와 silane coupling agent로 표면처리 후 이장재를 주입하여 전단결 합강도를 측정하였다. MMA와 TEGDMA의 농도별 표면 처리에 따른 의치상 레진과 이장재간의 전단결합강도에서는 Vertex self curing resin에서 95%, 90%, 80%, Kooliner에서는 95%, 90%에서 유의적으로 높게 나타났다(P<0.05). 또한, silane coupling agent 5%로 표면 처리한 그룹이 Vertex self curing resin과 Kooliner 모두에서 전단결합강도가 유의적 으로 높게 나타났다(P<0.05). 따라서 적절한 화학적 표면 처리는 의치상 레진과 이장재간의 결합력 증가에 영향을 미 치리라 사료된다. The purpose of this study was to evaluate the effect of the surface treatment of MMA and TEGDMA concentration, silane coupling agent on the shear bond strength of denture base resin and denture reliners. Denture base resin surface was treated with MMA and TEGDMA concentration, silane coupling agent. After denture reliners were injected bond strength was measured. The results of MMA and TEGDMA concentration on the shear bond strength of Vertex self curing resin showed that the value of MMA 95% and TEGDMA 5%, MMA 90% and TEGDMA 10%, MMA 80% and TEGDMA 20% groups were higher than that of other group(P<0.05). MMA and TEGDMA concentration on the shear bond strength of Kooliner resin showed that the value of MMA 95% and TEGDMA 5%, MMA 90% and TEGDMA 10% were higher than that of other group(P<0.05). Silane coupling agent on the shear bond strength of Vertex self curing resin and Kooliner showed that the value of MMA 95% and silane coupling agent 5% groups was higher than that of other group(P<0.05). Therefore, we could conclude that appropriate chemical surface treatments are supposed to affect the bond of denture base resin and denture reliners.

Influence of polymer–filler interactions on retraction behaviors of natural rubber vulcanizates reinforced with silica and carbon black

Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of applied polymer science Vol.99 No.3

<P>In general, silica-filled rubber compounds contain a silane coupling agent to improve the filler dispersion and polymer–filler interactions. The silane coupling agent modifies the silica surface and makes crosslinks between the rubber and the silica. Influence of the modification of silica on the retraction behaviors of natural rubber (NR) vulcanizates reinforced with silica and carbon black was studied. Variation of the retraction behaviors of NR vulcanizates with filler composition was also investigated. The vulcanizates containing the silane coupling agent were recovered faster than those without the silane coupling agent. The recovery difference between the vulcanizates without and with the silane coupling agent increased with increased silica content. For the vulcanizates containing the silane coupling agent, the retraction behaviors were nearly the same, irrespective of filler composition. But, for the vulcanizates without the silane coupling agent, the vulcanizate was recovered more and more slowly as the silica content increased. The experimental results are explained with the polymer–filler interactions, modification of silica surface, and formation of crosslinks between silica and rubber. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 691–696, 2006</P>

Influence of Cure Accelerator Content on Change of Crosslink Density by Thermal Aging in Natural Rubber Vulcanizates Filled with Silica

최성신,나창운,Choi, Sung-Seen,Nah, Changwoon 한국접착및계면학회 2002 접착 및 계면 Vol.3 No.2

실리카로 보강된 천연고무 가황물에서 가황촉진제의 양이 열노화에 의한 가교밀도의 변화에 미치는 영향에 대해 연구하였다. 또한 실란커플링제의 영향도 조사하였다. 가황촉진제로는 N-tert-butyl-2-benzothiazole sulfenamide(TBBS)를 실란 커플링제로는 bis-(3-(triethoxysilyl)-propyl)-tetrasulfide(TESPT)를 사용하였다. 가황물을 열노화 시키면 가교밀도는 증가하였고 노화 온도가 높을수록 그 변화 정도는 컸다. 실란 커플링제가 포함되지 않은 가황물의 가교밀도 변화가 실란 커플링제를 포함한 것에 비해 더 크게 나타났다. 실란 커플링제가 포함되지 않은 가황물의 경우에는 가교밀도의 변화에 대한 활성화 에너지가 가황촉진제의 함량이 증가할수록 순차적으로 낮아지는 경향을 보였다. The effect of cure accelerator content on the change in crosslink density by thermal aging was studied for silica-filled natural rubber (NR) vulcanizates. Influence of silane coupling agent was also investigated. N-tert-Butyl-2-benzothiazole sulfenamide (TBBS) and bis-(3-(triethoxysilyl)-propyl)-tetrasulfide (TESPT) were used as a cure accelerator and a silane coupling agent, respectively. The crosslink density increased by thermal aging and the increasing level became larger as the aging temperature increased. The degree of crosslink density change of the vulcanizates without the silane coupling agent was larger than that of the vulcanizates containing the silane coupling agent. For the vulcanizates silane coupling agent, the activation energy for the crosslink density change decreased with increase of the cure accelerator content in the vulvanizate.

Synthesis surface modified ZrO₂ nanoparticles with silane coupling agent for highly refractive film

강기주,유중환,김희정 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

ZrO₂ is useful material as high refractive index for providing high performance optical films. But ZrO₂-mixed organic resin is hard to coat on film uniformly, because ZrO₂ has bad dispersion problem. So it is hard to expect improvement of films refractive index. Therefore, the surface modification with hydrophobic agent is essential for dispersing ZrO₂ nanoparticles uniformly into the organic resin. In this study, silane coupling agents modified ZrO₂ nanoparticles are synthesized using zirconium n-propoxide, benzyl alcohol, and then modified with bifunctional silane coupling agents. The modified zirconia particles show good chemical bonding between ZrO₂ and silane coupling agents so, hydrophobicity enhanced in water floating test before modified samples.

실란 그라프트 수산화마그네슘의 첨가가 폴리프로필렌의 난연성 및 기계적 특성에 미치는 영향

홍미경,서민강,최웅기,김병석 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.3

In this work, the effect of silane coupling agent-grafted magnesium hydroxide on flame retardancy and mechanical properties of thermoplastic polypropylene (PP) were investigated. The correlation between the dispersion properties and the physical properties of the PP composites was studied in terms of various silane coupling agents. Changes in surface properties of silane-grafted magnesium hydroxide were observed by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) measurements. The variation of dispersion properties of magnesium hydroxide (MH) by silanegrafted was observed through a turbiscan. The flame retardant properties of the PP were analyzed by limiting oxygen index (L.O.I) and UL-94 vertical burning tests. The mechanical properties of the PP were evaluated by tensile and flexural strengths. From the FT-IR, the chemical bond (Si-O-C) of silane organic functional groups was observed on the surface of magnesium hydroxide and XPS was also confirmed the increase of elemental contents of Si and C. I.O.L values was increased, UL-94 vertical burning tests rating was resulred at V-2 to V-1. Consequently, the flame retardancy and mechanical properties of the PP composites were increased with the improvement of the dispersibility of MH which was attributed to the electrostatic repulsion and steric hindrance between the silane particles.

Effect of Silane Coupling Agent on Thermal Conductivity, Thermal and Mechanical Properties of Silicone Polymer Composites Containing Carbon fillers

곽보민,신영은,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Recently, great attention has been paid to the use of carbon materials for increasing thermal conductivity of polymer due to their unique nanostructures, high aspect ratio and superior thermal conductivity. Although fillers have a positive effect on polymer matrices, their nanoscale dimensions, and high surface areas make them difficult to disperse into the matrix. Silane coupling agent is a commonly used surface treatment agent. Grafting silane molecules onto fillers surface improve dispersion of the fillers in matrix, thereby improving the interfacial interactions. These improved interfacial interactions result in an enhancement of thermal and mechanical properties. This study was conducted to study the thermal conductivity of poly (dimethyl siloxane) composites filled with carbon fillers, including graphite and expanded graphite (EG), and to improve the mechanical properties of composites using silane coupling agents.

Effect of silane-grafted magnesium hydroxide on flame resistance and dispersion properties of polypropylene matrix

최웅기,홍미경,서민강 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

In this study, we studied the effects of silane coupling agents on dispersion properties of magnesium hydroxide. We also investigated the relationship between the dispersion properties of magnesium hydroxide and the flame resistance of the polypropylene (PP) matrix. As a result, the dispersion properties of the magnesium hydroxide was found to increase upon grafting of the silane coupling agent, resulting in increasing the flame resistance of PP matrix. These results indicated that the aggregation of magnesium hydroxide particles in the PP was blocked by grafting of the silane coupling agent which led to the improvement of flame resistance of PP matrix.