scholarly journals Deterioration Behavior of Epoxy Resin for Electronics Packaging and Its Adhesive Joint with Ni by Water Absorption

2021 ◽  
Vol 10 (6) ◽  
pp. 359-364
Author(s):  
Hironao MITSUGI ◽  
Riku SUZUKI ◽  
Ikuo SHOHJI ◽  
Tatsuya KOBAYASHI
Keyword(s):  
Water Absorption ◽  
Epoxy Resin ◽  
Adhesive Joint ◽  
Electronics Packaging

scholarly journals Starch-Jute fiber hybrid biocomposite modified with Epoxy resin layer: Fabrication and Experimental Characterization

2018 ◽  
Author(s):  
Akarsh Verma ◽  
Kamal Joshi ◽  
Amit Gaur ◽  
V. K. Singh
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Epoxy Resin ◽  
High Water ◽  
Epoxy Coating ◽  
Jute Fiber ◽  
Compression Moulding ◽  
Resin Layer ◽  
Major Disadvantage ◽  
Water Absorption Property

In this article, bio-composites derived from starch-glycerol biodegradable matrix reinforced with jute fibers have been fabricated using the wet hand lay-up and compression moulding techniques. Samples having different weight percentages of jute fiber in the starch matrix have been analysed. The fibers surface was chemically treated by alkaline sodium hydroxide for improving the interphase bonding between fiber and matrix. Tensile test for the composites were done and the sample with highest tensile strength was selected for further tests that included water absorption, scanning electron microscopy and thermal analysis. It has been concluded that the ultimate tensile strength was found to be maximum for the composition of 15% fiber by weight composite as 7.547 MPa without epoxy coating and 10.43 MPa with epoxy coating. The major disadvantage of bio-composite is its high water absorption property, which in this study has been inhibited by the epoxy resin layer. Herein, the results of various tests done disclose a noteworthy improvement in the overall properties of bio-composite, in comparison to the neat biodegradable starch matrix.

scholarly journals Effect of Gravel-sand Ratio on Physico-mechanical, Thermal and Macrostructural Properties of Micro Epoxy Polymer Concrete based on a Mixture of Alluvial-dune Sand

2020 ◽  
Vol 14 (1) ◽  
pp. 247-261
Author(s):  
Zineb Kerrida ◽  
Hichem Berkak ◽  
Zoubir Makhloufi ◽  
Madani Bederina ◽  
Ahmida Ferhat
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Epoxy Polymer ◽  
Polymer Concrete ◽  
Dune Sand ◽  
Optimal Values ◽  
Compressive And Flexural Strengths ◽  
Mechanical Performances ◽  
Crushed Limestone

Introduction: In the Polymer Concrete (PC) composites, aggregates are the most important constituent, which considerably affect their performance. The purpose of this experimental study is to examine the effect of Gravel-to-Sand (G/S) ratio on the physico-mechanical, thermal and microstructural properties of epoxy micro-polymer concrete made up of local aggregates. Materials & Methods: The Micro Epoxy Polymer Concrete (MEPC) studied consists of epoxy resin as a binder and a mixture of two types of sands (alluvial (0/0.63 mm) and dune (0/4 mm) sands), as well as crushed limestone gravel (3/8 mm). Six compositions were prepared with two epoxy resin contents (10% and 14% of the total weight of mixture) and three G/S ratios (0.25, 0.50 and 0.75). The studied properties are density, water absorption, compressive and flexural strengths, thermal conductivity, thermal diffusivity, specific heat and macrostructure. Results & Discussion: The obtained results show that the G/S ratio, as well as the epoxy resin content, has a significant influence on the properties of MEPC. In addition, 14% epoxy resin and the G/S ratio of 0.75 can be considered as optimal values, which lead to very interesting physico-mechanical performances (denser and less porous material, more resistant with almost similar thermal conductivity). Moreover, the density, the water absorption and the optical microscopic observation confirm that mixes containing 14% epoxy are more impermeable, compact and homogeneous than those containing 10% epoxy. Conclusion: Finally, it should be noted that the incorporation of aggregates being relatively coarse decreases the grains’ specific surface and reduces the porosity of the granular mix, which enable the epoxy product to completely cover the surface of mineral grains. A perfect covering of aggregate grains with a bender improves the adhesion between the aggregates and the polymer matrix.

INFLUENCE OF STRUCTURE OF POLYMERIC MATRIX ON STRUCTURE AND PROPERTY PRIMING COVERINGS

2021 ◽  
pp. 50-58
Author(s):  
V.A. Kuznetsova ◽  
◽  
V.G. Zheleznyak ◽  
S.L. Lonskii ◽  
N.A. Kovrizhkina ◽  
...  
Keyword(s):  
Water Absorption ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Water Resistance ◽  
High Water ◽  
Physicomechanical Properties ◽  
Structure And Property ◽  
Organic Silicon ◽  
To Receive ◽  
Kinetics Of

Adhesion, physicomechanical properties, and also kinetics of water absorption of priming coatings on basis the E-41 epoxy resin modified by liquid Thiokol 1 and by Laproxide AF, and also their phase structure are investigated. As hardeners of primer compositions organic silicon ammine ASOT-2 and low-molecular polyamide PO-200 has been used. It is shown that use of the reactive modifier Laproxide AF and hardener ASOT-2 in the epoxy and thiokol film-formers allows to receive priming coating with uniform finely divided phase structure with low porosity and high water resistance.

scholarly journals Increasing the strength of destroyed wood of wooden architecture monuments by surface modification

2018 ◽  
Vol 251 ◽  
pp. 01034 ◽  
Author(s):  
Elena Pokrovskaya
Keyword(s):  
Surface Modification ◽  
Mass Loss ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Surface Coating ◽  
Hydroxyl Groups ◽  
Layer Surface ◽  
Anglican Church ◽  
Covalent Bonds ◽  
Resin Solution

The Anglican Church in Arkhangelsk built in 1833 represents a wooden architecture monument. The article describes the strengthening of partially destroyed samples of the Anglican Church wood by surface modification. The first layer of the sandwich coating is nitrilotrimethylphosphonic acid, which forms covalent bonds with the substrate, partially strengthening the wood. The second layer is an epoxy resin solution, which forms covalent bonds with the coating of the first layer, with hydroxyl groups of the first layer involved in the curing of the second layer as well. A two-layer surface coating is formed, while the strength of the wood increases by 2 – 2.5 times, water absorption decreases by 3 times, and mass loss in combustion is no more than 9% according to GOST 27484-87. The monument preservation increases.

scholarly journals Study the effect of fiber loading and alkali treatment on the mechanical and water absorption properties of wheat straw fiber-reinforced epoxy composites

2017 ◽  
Vol 24 (5) ◽  
pp. 731-738 ◽  
Author(s):  
Varun Mittal ◽  
Shishir Sinha
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Wheat Straw ◽  
Alkali Treatment ◽  
Fiber Composites ◽  
Epoxy Composites ◽  
Absorption Properties ◽  
Fiber Loading ◽  
Treated Fiber

AbstractThe aim of this research was to study the feasibility of using wheat straw fiber with epoxy resin for developing natural fiber-polymer composites. For this purpose, the epoxy resin was reinforced with 5, 10, 15, 20, and 25 wt.% of the wheat straw fiber with the help of the hand lay-up technique. Further, in order to improve the composite characteristic, wheat straw fibers were treated with three different concentrations of alkali (1%, 3%, and 5%). The mechanical and water absorption properties of the treated fiber composites were characterized and compared with those of untreated fiber-filled epoxy composites. It was observed that the mechanical properties and water resistance were reduced with the increase in wheat straw fiber loading from 5 to 25 wt.%. Among the three levels of alkali treatment, the composite made with 3% alkali-treated fiber exhibited superior mechanical properties than the other untreated and treated fiber composites, which pointed to an efficient fiber-matrix adhesion. The scanning electron microscope was used to observe the surface features of the wheat straw fiber.

Tuning of thermal and dielectric properties for epoxy composites filled with electrospun alumina fibers and graphene nanoplatelets through hybridization

2015 ◽  
Vol 3 (27) ◽  
pp. 7195-7202 ◽  
Author(s):  
Jun-Wei Zha ◽  
Tian-Xing Zhu ◽  
Yun-Hui Wu ◽  
Si-Jiao Wang ◽  
Robert K. Y. Li ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Epoxy Resin ◽  
Electronics Packaging ◽  
Graphene Nanoplatelets ◽  
Electrical Insulation ◽  
Epoxy Composites ◽  
Alumina Fibers ◽  
Excellent Adhesion ◽  
Cure Shrinkage

Epoxy resin is widely used for electrical and electronics packaging in various forms due to its excellent adhesion, low cure shrinkage and good electrical insulation.

Cracking in a glassy epoxy resin induced by water absorption

Polymer ◽  
1980 ◽  
Vol 21 (6) ◽  
pp. 713-715 ◽  
Author(s):  
R.F. Fedors
Keyword(s):  
Water Absorption ◽  
Epoxy Resin
Sign in / Sign up

Export Citation Format

Share Document