• Title/Summary/Keyword: Adhesion properties

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Surface Modification of Biomaterials for Hard Tissue Substitutes to Improve Biocompatibility and Osteoconductivity (생체적합성 및 골전도성 향상을 위한 경조직 대체용 생체재료의 표면개질)

  • Kim, Sung-Wook;Lee, Woo-Kul
    • Applied Chemistry for Engineering
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    • v.16 no.6
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    • pp.725-730
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    • 2005
  • In the development of biomaterials as a substitute of hard tissues, the biocompatibility and osteoconductivity of the biomaterial are considered to be one of the most significant considerations. These biological properties of a material can be greatly improved by the modification of the surface properties by the depositing calcium phosphate thin films on the material since calcium phosphate films possess similar chemical compositions to hard tissues. The success of a material as a biomaterial will be determined by the interaction of the surface of the material with the adhesion molecules which induce cellular adhesion and biological responses of the adherent cells. Depending on the adsorption mechanisms and adsorbed conformation of the adhesion molecules on the surface of the biomaterial, cellular responses, such as adhesion, proliferation and differentiation of osteoblast cells, can be promoted or restricted. It has been reported that materials of which surfaces were modified with thin films of calcium phosphate appeared to be more osteoconductive. Rapid formations of bone nodule in addition to higher differentiations of osteoblast have been observed on the calcium phosphate thin films.

The Effects of Hexamethoxymethylmelamine on the Adhesion of Rubber to Brase-Plated Steel Cord (Hexamethoxymethylmelamine이 고무-황동피복코드간의 접착에 미치는 영향)

  • Kim, Wan-Young;Kim, Youn-Sop;Yug, Gyeong-Chang;Kim, Hyung-Soon;Lee, Jeong-Yong;Choi, Sang-Won
    • Applied Chemistry for Engineering
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    • v.3 no.3
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    • pp.422-429
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    • 1992
  • The morphology and adhesion properties of rubber compounds containing resorcinol formaldehyde(RF) resin and hexamethoxymethylmelamine(HMMM) used in adhesion of rubber to brass-plated steel cord was investigated. The resins were spherical particles about $2000{\AA}$ diameter and distributed in rubber compounds homogeneously, and the cured compound with steel cord showed migration of resin to steel cord. Also, modulus was increased with increasing HMMM contents. The loss of adhesion between rubber and steel cord was likely to be at initial stages by thermal aging. Considering the physical properties, suability of adhesion layer and thermal aging property, optimum ratio of RF resin and HMMM was 1 : 0.9.

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Historical Trends of Micromechanical Testing Methods for Structural Fiber Reinforced Composites to Evaluate the Interfacial Adhesion (구조용 섬유강화복합재료의 계면접착 특성 평가를 위한 미세역학시험법의 연구동향 고찰)

  • Park, Joung-Man;Kim, Jong-Hyun;Kim, Dong-Uk;Kwon, Dong-Jun
    • Journal of Adhesion and Interface
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    • v.23 no.3
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    • pp.59-69
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    • 2022
  • In composite materials, the adhesion and interfacial properties were the most important factors to obtain high performance of mechanical properties. This review paper had been focused on the micromechanical evaluation methods for the interfacial property historically. The interfacial property of fiber-reinforced composites (FRC) could be evaluated using only a single fiber and matrix via various micromechanical testing methods. Self-sensing due to the fracture behavior of FRC could be determined and discussed more critically and clearly using electro-micromechanical evaluation. In this paper, the research trends for micro-mechanical evaluation of composites was summarized, and their practical applications would be suggested in the future.

Viscoelastic and Acoustic Characterization of Coatings for Stringed Instruments (현악기용 음향기능성 도료의 점탄성적 성질과 음향적 성질)

  • Choi, Jae-Hoon;Lee, Byoung-Hoo;Kim, Hyun-Joong;Chung, Woo-Yang
    • Journal of the Korean Wood Science and Technology
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    • v.33 no.4 s.132
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    • pp.15-22
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    • 2005
  • The acoustic properties of various coatings for stringed musical instruments made were investigated. The applied coatings were urethane topcoat, oil stain, natural varnish, cashew and UV-curable epoxy coating. Acoustic properties of coatings inferred from a resonance frequency and a damping measured by FFT analyzer and tan ${\delta}$ measured by DMTA. Acoustic properties from resonance frequency and damping were analyzed. Optimum coating for stringed instruments was determined by viscoelastic properties and acoustic properties of coating.

Water Treatment Effect of Bamboo Fiber on the Mechanical Properties, Impact Strength, and Heat Deflection Temperature of Bamboo Fiber/PLA Biocomposites (대나무섬유/PLA 바이오복합재료의 기계적 특성, 충격강도 및 열변형온도에 미치는 대나무섬유 수처리의 영향)

  • Cho, Yong Bum;Cho, Donghwan
    • Journal of Adhesion and Interface
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    • v.17 no.3
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    • pp.96-103
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    • 2016
  • In this work, pellets consisting of cellulose-based natural fiber bamboo and poly(lactic acid) (PLA) was prepared by extrusion process and then bamboo fiber/PLA biocomposites with various fiber contents were produced by injection molding process. The water treatment effect of bamboo fibers on the flexural, tensile, and impact properties and heat deflection temperature of the biocomposites were investigated. The thermal stability of bamboo and the flexural properties, tensile modulus, and impact strength depended on the presence and absence of water treatment as well as on the fiber content, whereas the heat deflection temperature are influenced mainly by water treatment. The increase of the mechanical and impact properties of biocomposites is ascribed to the improvement of the interfacial adhesion between the bamboo fibers and the PLA matrix by the water treatment. The result suggests that the pre-treatment of natural fibers by using water, which is environment-friendly and labor-friendly, may contribute to enhancing the performance of biocomposites.

Effect of Monomer on Crosslinking Properties of Acrylic Pressure-Sensitive Adhesives (아크릴계 점착제의 제조와 가교물성에 대한 모노머의 영향)

  • Kim, Pan Soo;Lee, Won-Ki
    • Journal of Adhesion and Interface
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    • v.17 no.2
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    • pp.56-61
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    • 2016
  • This study was to investigate the effect of main monomer, butyl acrylate instead of 2-ethylhexyl acrylate, of acrylic PSAs on adhesive properties. The copolymers of butyl acrylate, acrylic acid and 2-hydroxyethyl acrylate were synthesized and their adhesive properties were investigated after crosslinking with two different agents. Comparing to 2-hydroxyethyl acrylate-based one which has branch-like side groups, butyl acrylate-based PSA with linear side groups show poor adhesive properties. In case of crosslinking agent, epoxy-typed agent than isocyanate-typed one showed better properties than isocyanate-typed one because epoxy-typed agent has more crosslinking sites and produces more flexible bonds, ester and ether, than isocynate-typed one. Most adhesive properties of PSAs were increased with acid content.

Adhesion Characteristics of Acrylic Pressure Sensitive Adhesives on Thin Wafer Materials - Effect of Acrylic Copolymer Side Chain - (아크릴계 점착제와 초박형 웨이퍼소재와의 점착특성 - 아크릴 중합체의 측쇄의 영향 -)

  • Ryu, Chong-Min;Nam, Young-Hee;Lee, Seung-Hyun;Kim, Hyung-Il;Lim, Dong-Hyuk;Kim, Hyun-Joong;Kim, Kyung Man
    • Journal of Adhesion and Interface
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    • v.10 no.3
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    • pp.134-140
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    • 2009
  • The acrylic copolymers with variation in side chain were synthesized based on molecular design. Wettability and adhesion properties on the wafer surface were investigated for these acrylic copolymer pressure sensitive adhesives. Three-dimensional networks of linear acrylic copolymers were produced with epoxy-type Tetra-DX cross-linking agent. The effect of cross-linking on adhesion characteristics was investigated. The side chain of acrylic copolymer played more important role in wettability than the interfacial interaction. As the degree of cross-linking increased, both probe tack and peel strength decreased. Also, heat resistance measured by SAFT increased with cross-linking; however, it showed the deterioration when excess cross-linking agent was added.

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Effect of Thermal Aging on the Change of Interfacial Adhesion between Polyketone Cord and Rubber by RFL Primer Treatment (RFL 프라이머 처리에 따른 폴리케톤 코드사와 고무 간의 계면접착성 변화에 열노화가 미치는 영향)

  • Jo, Hani;Oh, Woo Jin;Kang, Song Hee;Lee, Seung Goo
    • Textile Coloration and Finishing
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    • v.30 no.2
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    • pp.77-89
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    • 2018
  • In the case of fiber/rubber composites for tire applications, the interfacial adhesion between fiber and rubber significantly affects the physical properties of the finished products. Generally, organic synthetic fibers used for tire cords are treated with resorcinol formaldehyde latex(RFL) primer on the surface of the fiber to improve the adhesion to rubber. Changes of adhesion between rubber and tire cords might weaken as temperature rises due to overheating of car engine and friction with road. In this study, the effects of temperature on the primer treated polyketone cord/rubber composites and the changes in interfacial adhesion were investigated. Polyketone cord/rubber composites were prepared after RFL solution treatment on the surface of polyketone fibers. After that, composites was thermally aged at different temperature conditions(60, 80, 100, $120^{\circ}C$) and times(1, 5, 10, 15days). The adhesion strength of polyketone cord/rubber composite treated with RFL primer was higher than untreated composite by more than 3 times. After heat aging, the adhesion strength of untreated polyketone cord/rubber composites increased while the RFL treated polyketone cord/rubber composites decreased somewhat.

Improvement of Adhesion of Footwear Nylon Fabric by Corona Treatment (코로나 처리를 이용한 신발용 나일론 직물의 접착력 향상)

  • Lee, Jae Ho
    • Journal of Adhesion and Interface
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    • v.7 no.3
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    • pp.26-33
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    • 2006
  • Nylon fabrics were corona treated with different current intensity (5, 10, 15, 20 A) and feeding speed (5, 10, 15 m/min). We confirmed the change of nylon fabrics surface using X-ray diffraction apparatus, scanning electron microscopy (SEM) and X-ray photoelectron spectrometer (ESCALAB). And the change of physical properties through measuring the tensile strength, tear strength, bonding and wet bonding strength. Thermosetting reactive polyurethane hot melt adhesive was used in the adhesion of nylon fabrics. Functional groups were introduced on nylon fabric surface by treating the fabrics in air atmosphere with corona discharge, and the result adhesion was improved. Bonding strength of the nylon fabric treated with corona was increased with increasing current intensity and decreasing feeding speed.

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