Adhesion Promotion by Surface-Modification at the Pmma-Metal Interface for Liga-Type Processing

1998 ◽  
Vol 518 ◽  
Author(s):  
S. S Das ◽  
C. G.Khan Malek
Keyword(s):  
Bond Strength ◽  
Stress Measurement ◽  
Chemical Oxidation ◽  
Interfacial Bond Strength ◽  
Good Adhesion ◽  
Adhesion Promoter ◽  
Adhesion Promoters ◽  
Adhesion Promotion ◽  
Cu Substrates ◽  
Substrate Roughening

AbstractThe formation of high aspect ratio Micro-Electro-Mechanical Structures (HI-MEMS) requires good adhesion of the thick microstructures to the substrate. The interfacial bond strength between PMMA and various metal substrates (Ti, Cu, Au, and Ni), in the preliminary stages of the LIGA process, was evaluated by shear stress measurement. Adhesion promotion processes have been investigated such as texturing of the surface of Ti and Cu substrates by chemical oxidation or thermal processing of the PMMA sheet, and use of a positive resist as an interfacial adhesion promoter. Several fold increases in bond strength were obtained, the largest increase associated with a combination of substrate roughening, thermal treatment and use of adhesion promoters.

scholarly journals Improvement of Asphalt-Aggregate Adhesion Using Plant Ash Byproduct

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 605 ◽  
Author(s):  
Zhuangzhuang Liu ◽  
Xiaonan Huang ◽  
Aimin Sha ◽  
Hao Wang ◽  
Jiaqi Chen ◽  
...  
Keyword(s):  
Asphalt Binder ◽  
Field Performance ◽  
Test Method ◽  
Test Results ◽  
Adhesion Promoter ◽  
Adhesion Promoters ◽  
Adhesion Promotion ◽  
Pavement Damage ◽  
Plant Ash ◽  
Asphalt Film

The adhesion bonding between asphalt and aggregate significantly influences field performance and durability of asphalt pavement. Adhesion promoters are typically used to improve asphalt-aggregate bonding and minimize moisture-related pavement damage, such as cracking and raveling. This study evaluated the effectiveness of plant ash byproduct as adhesion promoter to improve asphalt-aggregate adhesion performance. Three commonly used aggregate types (granite, basic rock, and limestone) and two asphalt binder types were used in laboratory testing. A modified stripping test method was developed to evaluate test results with image analysis and measurement of asphalt film thickness. The contact angle test and scanning electron microscopy (SEM) with energy disperse spectroscopy (EDS) were conducted. Test results showed that plant ash lixivium significantly improved asphalt-aggregate adhesion. Among three aggregate types, granite yielded the worst asphalt-aggregate adhesion for both control and treated specimens. The effectiveness of adhesion promotion varied depending on the type of asphalt or aggregate and temperature. The SEM/EDS observations showed that the mesh-like crystalline was formed at the interface between asphalt binder and aggregate in the treated specimen, which was believed to enhance the interfacial bonding and prevent asphalt film peeling off from aggregate.

scholarly journals Evaluation of enamel damages following orthodontic bracket debonding in fluorosed teeth bonded with adhesion promoter

2016 ◽  
Vol 10 (02) ◽  
pp. 193-198 ◽  
Author(s):  
Tahreh Baherimoghadam ◽  
Sahar Akbarian ◽  
Reza Rasouli ◽  
Navid Naseri
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Locus Ceruleus ◽  
Orthodontic Brackets ◽  
Adhesion Promoter ◽  
Orthodontic Bracket ◽  
Adhesion Promoters ◽  
Unbiased Stereology ◽  
Signed Rank ◽  
Group 2

ABSTRACT Objective: To evaluate shear bond strength (SBS) of the orthodontic brackets bonded to fluorosed and nonfluorosed teeth using Light Bond with and without adhesion promoters and compare their enamel damages following debonding. Materials and Methods: In this study, 30 fluorosed (Thylstrup and Fejerskov Index = 4–5) and 30 nonfluorosed teeth were randomly distributed between two subgroups according to the bonding materials: Group 1, fluorosed teeth bonded with Light Bond; Group 2, fluorosed teeth bonded with adhesion promoters and Light Bond; Group 3, nonfluorosed teeth bonded with Light Bond; Group 4, nonfluorosed bonded with adhesion promoters and Light Bond. After bonding, the SBS of the brackets was tested with a universal testing machine. Stereomicroscopic evaluation was performed by unbiased stereology in all teeth to determine the amount of adhesive remnants and the number and length of enamel cracks before bonding and after debonding. The data were analyzed using two-way analysis of variance, Kruskal–Wallis, Wilcoxon Signed Rank, and Mann–Whitney test. Results: While fluorosis reduced the SBS of orthodontic bracket (P = 0.017), Enhance Locus Ceruleus LC significantly increased the SBS of the orthodontic bracket in fluorosed and nonfluorosed teeth (P = 0.039). Significant increasing in the number and length of enamel crack after debonding was found in all four groups. There were no significant differences in the length of enamel crack increased after debonding among four groups (P = 0.768) while increasing in the number of enamel cracks after debonding was significantly different among the four groups (P = 0.023). Teeth in Group 2 showed the highest enamel damages among four groups following debonding. Conclusion: Adhesion promoters could improve the bond strength of orthodontic brackets, but conservative debonding methods for decreasing enamel damages would be necessary.

Experimental Research on Interfacial Bond Performance in Rock Anchor with High-Performance Grouting Medium

2012 ◽  
Vol 517 ◽  
pp. 932-938 ◽  
Author(s):  
Zhi Fang ◽  
Hong Qiao Zhang
Keyword(s):  
Rock Mass ◽  
Bond Strength ◽  
High Performance ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Bond Performance ◽  
Pull Out ◽  
Steel Bar ◽  
Reactive Powder ◽  
Ground Anchor

There exist the problems such as low bond strength and bad durability in the ordinary grouting slurry of the ground anchor system at present. The high-performance grouting mediums RPC (Reactive Powder Concrete) and DSP (Densified Systems containing homogeneously arranged ultrafine Particles) would become the potential replacement of grouting medium in ground anchor resulting from their high compressive strength, durability and toughness. Based on a series of pull-out tests on ground anchors with different high-performance grouting medium of RPC and DSP , different bond length in the construction field, the bond performance on the interfaces between anchor bolt (deformed steel bar) and grouted medium as well as between grouted medium and rock mass was studied. The results indicate that the interfacial bond strength between RPC or DSP and deformed steel bolt ranges within 23-31Mpa, far greater than that (about 2-3MPa) between the ordinary cementitious grout and deformed steel bar. Even though the interfacial bond strength between the grouted medium and rock mass of limestone was not obtained in the test since the failure mode was pull-out of those steel bar rather than the interface shear failure between grouted medium and rock mass, the bond stress on the interface reached 6.2-8.38 MPa, also far greater than the bond strength (about 0.1-3MPa) between the ordinary cementitious slurry and rocks.

The Study of Fluorinated Amorphous Carbon as Low-K Dielectric Material and its Interface with Copper Metallization

1999 ◽  
Vol 565 ◽  
Author(s):  
N. Ariel ◽  
M. Eizenberg ◽  
E. Y. Tzou
Keyword(s):  
Amorphous Carbon ◽  
Nuclear Reactions ◽  
Dielectric Material ◽  
Copper Metallization ◽  
Limiting Factor ◽  
Adhesion Promoter ◽  
Adhesion Promotion ◽  
High Resolution Tem ◽  
Rc Delay ◽  
Low K

AbstractIn order to achieve better performance of devices, the interconnects RC delay time, the limiting factor of the device speed today, must be reduced. This calls for a new interconnect stack: lower resistivity Copper and low k materials (k<3) as dielectrics.Fluorinated amorphous carbon (a-F:C) prepared by HDP- CVD is an attractive candidate as a low-k material. In this work we have studied the film, its stability and its interface with Copper metallization. The high density plasma CVD process resulted in a film which contains C and F at a ratio of 1:0.6 as determined by Nuclear Reactions Analysis. XPS analysis of the Cls transition indicated four types of bonds: C-C, C-CF, CF, and CF2. X-ray diffraction as well as high resolution TEM analyses proved that the film was amorphous at least up to 500°C anneal. For various applications, the advantage of adding a thin bi-layer of a-SiC/SiOx for adhesion promotion purposes was demonstrated. In addition, the interface of a-F:C and the adhesion promoter layer with Ta, TaN and Cu was studied. No interdiffusion was observed by SIMS after 400°C annealing. 500°C annealing caused F outdiffusion from the film and Cu diffusion into the adhesion promoter layer.

scholarly journals Effect of Adhesion Promoter on Bond Strength of Reconditioned Brackets – an In vitro Study

2017 ◽  
Vol 22 (1) ◽  
pp. 1-7
Author(s):  
Vikas Garg ◽  
Yuvika Mittal ◽  
Shefally Garg ◽  
Munish Goel ◽  
Sanjeev Soni ◽  
...  
Keyword(s):  
Bond Strength ◽  
In Vitro Study ◽  
Vitro Study ◽  
Adhesion Promoter

scholarly journals A Special Single-Fibre Pull-Out Technique for Determining the Fiber/Cement Interfacial Bond Strength

2002 ◽  
Vol 11 (1) ◽  
pp. 096369350201100 ◽  
Author(s):  
J. M. Caceres ◽  
A. N. Netravali
Keyword(s):  
Shear Strength ◽  
Bond Strength ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Specimen Geometry ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Pull Out ◽  
Fibre Cement

The paper discusses a simple specimen geometry to obtain the fibre/cement interfacial shear strength (IFSS). The specimens are easy to prepare and easy to test. The technique gives reliable and reproducible results. IFSS results for five different fibres with cement were measured. Most IFSS values obtained are in the range of 0.15 to 1.5 MPa. Despite the simplicity of the technique presented in this study, the results are in agreement with those obtained by several other researchers using different techniques and specimen geometry.

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