실리카-커플링제-고무의 화학 결합 형성과 특성 분석

고은아 ( Eun Ah Ko ),최성신 ( Sung Seen Choi ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.3

용매를 사용하지 않고 실리카와 실란커플링제의 반응을 투과 방식 휴리에 변환 적외선 분광법(FTIR)과 열중량 분석법(TGA)을 이용하여 조사하였다. 실란커플링제로 bis[3-(triethoxysilylpropyl) tetrasulfide] (TESPT)를 사용하였다. 미반응 TESPT를 제거한 후, FTIR로 화학 결합 형성을 분석하였고 TGA로 반응한 TESPT 함량을 결정하였다. 커플링제의 함량이 증가할수록 실리카에 결합한 커플링제의 양이 증가하였으나, 커플링제를 과량으로 첨가하면 커플링제 간의 축합반응에 의해 올리고머를 형성하였다. 실리카와 커플링제 그리고 고무의 결합을 확인하기 위하여 개질 실리카와 저분자량 액상 BR을 반응시켜 실리카-커플링제-BR 모델 복합체를 제조하여 화학 결합 형성을 조사하였다. 미반응 고무는 용매를 사용하여 제거하였고 FTIR과 TGA로 분석하였다. BR은 개질 실리카의 커플링제와 반응하여 화학 결합을 형성하였다. 실리카-커플링제-BR의 화학 결합 형성으로 인해 실리카 표면의 극성은 크게 낮아졌고 실리카 입자 크기는 커지는 효과를 보였다. Reaction between silica and silane coupling agent without solvent was investigated using transmission mode Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Bis[3-(triethoxysilylpropyl) tetrasulfide] (TESPT) was used as a silane coupling agent. After removing the unreacted TESPT, formation of chemical bonds was analyzed using FTIR and content of reacted TESPT was determined using TGA. Content of the coupling agent bonded to silica increased with increase in the coupling agent content, but the oligomers were formed by condensation reaction between coupling agents when the coupling agent was used to excess. In order to identify bonds formed among silica, coupling agent, and rubber, a silica-coupling agent-BR model composite was prepared by reaction of the modified silica with liquid BR of low molecular weight and chemical bond formation of silica-coupling agent-BR was investigated. Unreacted rubber was removed with solvent and analysis was performed using FTIR and TGA. BR was reacted with the coupling agent of the modified silica to form chemical bonds. Polarity of silica surface was strikingly reduced and particle size of silica was increased by chemical bond formation of silica-coupling agent-BR.

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.

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. The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.3

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.

보강섬유와 시멘트와의 매트릭스(Matrix) 구조에서 계면가교제가 계면결착에 미치는 특성

최응규(Choi Eung-kyoo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.7

It is necessary to reinforce the interfacial adhesion between components in fiber reinforced cement composite either by surface treatment thereby producing interfacial attraction or by reinforce the interfacial adhesion between organic and inorganic materials by means of coupling agent. The objective of the study is to propose a practical approach in selecting a suitable interfacial coupling agent for an assorted reinforcing fiber and cement compounds and to determine the most appropriate coupling agent for a particular combination. The experiment analyzed the integrity of the interfacial adhesion by means of VMS(video microscope system) as well as by measurement of interfacial adhesion, demonstrating polyacrylamide, a polymeric coupling agent, being the most effective coupling agent for the purpose of reinforcing the interfacial adhesion between reinforcing fiber and cement. There are three different kinds of PAM depending on the ionization; N-PAM, A-PAM and C-PAM, each reinforcing fiber material having its own optimum PAM. The experiment has demonstrated that N-PAM was least effective for all the reinforcing fibers used in the analysis. While A-PAM coupling agent was most effective in PVA fibers, C-PAM proved to be the most effective coupling agent in both acrylic and carbon fibers.

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>

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.

Effect of compound coupling agent treatment on mechanical property and water absorption of hollow glass microspheres/epoxy composite

Zhaolin Zhu,Yin Liu,Guiyang Xian,Yan Wang,Chongmei Wu,Xiaobo Peng,Jinxiang Wang,Lingbing Kong 한국고분자학회 2023 Macromolecular Research Vol.31 No.8

Hollow glass microspheres (HGMs), as a reinforcing material to prepare lightweight high-performance composites, have excellent mechanical properties. However, the composites prepared by simply mixing hollow glass microspheres with polymer resin have poor performance. In this study, compound coupling agent-modified HGM/EP composites were prepared by casting process with two silane coupling agents as compound coupling agents. Scanning electron microscopy and infrared (IR) spectroscopy were used to characterize the treated HGM. Meanwhile density, water absorption behavior, and mechanical properties of the modified HGM-filled epoxy composites were examined. It is found that the compound coupling agent could effectively improve the interfacial bonding between HGM and the matrix resin. A new chemical bond was formed between HGM and EP, which was confirmed by IR spectroscopy. Compared with their untreated counterparts, the composites treated with the complex coupling agent exhibited excellent mechanical properties, along with lower density and lower water absorption.

Silane Coupling Agent가 의치상 수리강화에 미치는 효과

박다령(Da-Ryeong Park),유상희(Sang-Hui Yu),배지명(Ji-Myung Bae),오승한(Seung-Han Oh) 대한치과재료학회 2012 대한치과재료학회지 Vol.39 No.3

The purpose of this study was to evaluate the effect of the surface treatment of silane coupling agents on the reinforcement of repaired denture and find the optimal condition of silane coupling agent showing highest 3-point flexural strength. Base plate was prepared by heat curing denture base resin, and the region to be repaired was fabricated at the form of Butt Joint. Three kinds of silane coupling agent (3-Methacryloxypropyltrimethoxysilane; MPS, Vinyltriethoxy silane; VTS, 3-Aminopropyltriethoxysilane; APS) was added to the monomer of denture repair resin with 0.1, 0.5, 1.0 and 2.0 % of silane coupling agent. The results of 3-point flexural strength showed that the value of 0.5 % MPS experimental group was higher than that of other MPS groups( P<0.05). The value of 3-point flexural strength of 0.1% VTS group was higher than that of other VTS groups( P<0.05). However, there was no significant difference between the values of each APS experimental group( P>0.05). Therefore, we could conclude that the kinds and concentrations of silane coupling agent are supposed to affect the bond of repaired denture and repair resin.

Synthesis and Characterization of Compound Coupling Agent-Modified Hollow Glass Microspheres/Epoxy Composites

Zhaolin Zhu,Yin Liu,Guiyang Xian,Yan Wang,Chongmei Wu,Xiaobo Peng,Lingbing Kong 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9

In this study, hollow glass microsphere/epoxy composites modified with compound coupling agent of titanate (CS201) and silane (KH540) were prepared and characterized. The addition of the compound coupling agent improves the interfacial bonding between the microbeads and the resin matrix. Scanning electron microscopy results indicated that the compound coupling agent can effectively reduce the number of voids between the microbeads and the resin. FTIR and XPS spectra showed that new chemical bonds were formed between the hollow glass microspheres and resin, which enhanced the interfacial bonding between them. By testing the water absorption and mechanical properties of the composites, it found that the addition of the hybrid coupling agent can reduce the water absorption to a minimum level of 1.184%. Due to the improvement of interfacial compatibility, mechanical properties of the composites were enhanced, (with tensile strength of 43.03 MPa, bending strength of 44.56 MPa, bending modulus of 1407 MPa and compressive strength of 81.55 MPa). When the content of the coupling agent was 5% and the volume ratio of CS201 to KH540 was 1:1, the synergistic enhancement effect was the most significant.