• Title, Summary, Keyword: interfacial adhesive force

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XPS Analysis of PVDF Film Treated by Corona Discharge in Ethyl Methacrylate Vapor Atmosphere (에틸메타크릴레이트 증기 분위기에서 코로나 방전 처리한 PVDF 필름의 XPS 분석)

  • Moon, HuiKwon;Seomoon, Kyu
    • Applied Chemistry for Engineering
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    • v.27 no.6
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    • pp.627-632
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    • 2016
  • Ethyl methacrylate (EMA) monomer coupling onto the polyvinylidene fluoride (PVDF) film surface was attempted to enhance the interfacial adhesive force between PVDF-polyvinyl chloride (PVC) bilayer films via dielectric barrier corona discharge. The interfacial forces were quite enhanced when PVDF films were treated by corona discharge in an EMA 1% atmosphere. The contact angle of PVDF films decreased due to corona treatment. X-ray photoelectron spectroscopy (XPS) analysis showed that the carbon and oxygen content of the PVDF film surface increased with corona discharge while the fluoride content decreased. The curve fitting of XPS $C_{1s}$ peaks revealed that the non-polar C-C bonded carbon and oxygen-bonded carbon increased gradually with corona treatment, while the fluorine-bonded carbon decreased.

Interfacial Adhesion Properties of Surface Treated Polyarylate Fiber with Polyethylene Naphthalate (폴리아릴레이트 섬유의 표면처리에 의한 폴리에틸렌 나프탈레이트 수지와의 계면접착특성)

  • Yong, Da Kyung;Choi, Han Na;Yang, Ji Woo;Lee, Seung Goo
    • Journal of Adhesion and Interface
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    • v.13 no.1
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    • pp.24-30
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    • 2012
  • Morphological changes of polyarylate (PAR) fiber treated with formic acid and ultraviolet (UV) were observed by using a scanning electron microscope (SEM) and an atomic force microscope (AFM). The results were analysed by using root mean square (RMS) roughness. In addition, the chemical changes of surface was investigated using contact angle and the interfacial adhesive strength between PAR fiber and PEN (Polyethylene naphthalate) matrix was calculated using the Pull-out test results. As the acid treatment concentration and UV irradiation time increased, cracks and pores were produced on the PAR fiber surface. Due to the roughness increased, the contact angle was decreased. For this reason, RMS roughness of PAR fiber was increased and the interfacial adhesive strength between the PAR fiber and PEN matrix was improved. The increase of interfacial adhesive strength was responsible for the increase of surface area which have cracks and pores.

Adhesion Characteristics of Surface Treated Polyurethane Foam Core Sandwich Structures (표면 처리된 폴리우레탄 폼 샌드위치 구조의 접합 특성)

  • Lee, Chang-Sup;Lim, Tae-Seong;Lee, Dai-Gil
    • Proceedings of the KSME Conference
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    • pp.38-43
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    • 2001
  • The interfacial adhesive joining characteristics of the foams are very important for the structural integrity of sandwich structures. Peel strength is one of the best criteria for the interfacial characteristics of the sandwich structures and peel energy is most commonly used for the interfacial characteristics. The peel strength is the first peak force per unit width of bond line required to produce progressive separation by the wedge or other crack opening type action of two adherends where one or both undergo significant bending and the peel energy is the surface active energy per unit width of bond line. In this work, to investigate the strengthening effect of resin treatment on the interfacial surface of foam material, peel strength and peel energy of epoxy resin treated polyurethane foam core sandwich structures were obtained by the cleavage peel tests and compared with those of non surface treated polyurethane foam core sandwich structures.

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Effect of 3-Isocaynatopropyl Triethoxy Silane on PU Adhesive (3-Isocaynatopropyl Triethoxy Silane이 PU 접착제에 미치는 영향)

  • Ju, Honghee;Jang, Euisub;Park, Chan Young;Lee, Won-Ki;Kim, Taekyun;Chun, Jae-Hwan
    • Journal of Adhesion and Interface
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    • v.14 no.1
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    • pp.36-42
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    • 2013
  • To improve hydrolytic stability of polyurethane (PU) adhesives, a silane coupling agent (SCA) was added. 3-Isocyanatopropyl triethoxy silane (ITS) as a SCA has two functional groups in the main chain and it is used to improve an interfacial interaction between polymer and inorganic material or metal. In this study, PU adhesives with different amounts of ITS from 0 to 1 wt% were synthesized. Pot time, modulus, thermal stablilty, and adhesive force of the obtained samples were measured. The results showed that the adhesives with ITS showed better properties than that of pure one.

Structural behavior on the steel beam with strengthening bonded carbon plate (카본판을 접착보강한 강재의 거동분석)

  • Sung, Ikhyun
    • Journal of the Society of Disaster Information
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    • v.12 no.1
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    • pp.54-61
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    • 2016
  • The use of advanced composite materials in strengthening and repair of existing structures is increasing rapidly. This paper describes an effectiveness of a bonding of carbon fiber reinforced sheets to corroded steel members for the repair. Three types of surface treatment, what we call cleaning, of corroded plate are chosen as parameters. They are "without cleaning","removal of painting by brushing" and "complete removal of painting". From the experimental study, the following findings are obtained. 1) When the steel plate is subjected to tensile force, carbon fiber sheets adhered to the painted steel gives a higher strength against peeling compared to that of the plate without painting, 2) The grade of surface treatment, or cleaning of the corroded steel plate affects the strengthening effect.

Flexural behaviour of steel beams reinforced by carbon fibre reinforced polymer: Experimental and numerical study

  • Tahar, Hassaine Daouadji;Boussad, Abbes;Abderezak, Rabahi;Rabia, Benferhat;Fazilay, Abbes;Belkacem, Adim
    • Structural Engineering and Mechanics
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    • v.72 no.4
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    • pp.409-420
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    • 2019
  • The paper presents the results of an experimental and numerical programme to characterize the behaviour of steel beams reinforcement by composite plates. Important failure mode of such plated beams is the debonding of the composite plates from the steel beam due to high level of stress concentration in the adhesive at the ends of the composite plate. In this new research, an experimental and numerical finite element study is presented to calculate the stresses in the sika carbodur and sika wrap reinforced steel beam under mechanical loading. The main objective of the experimental program was the evaluation of the force transfer mechanism, the increase of the load capacity of the steel beam and the flexural stiffness. It also validated different analytical and numerical models for the analysis of sika carbodur and sika wrap reinforced steel beams. In particular, a finite element model validated with respect to the experimental data and in relation to the analytical approach is presented. Experimental and numerical results from the present analysis are presented in order to show the advantages of the present solution over existing ones and to reconcile debonding stresses with strengthening quality.