Improving the film-forming ability of BaTiO3/epoxy resin suspension by adjusting the solvent composition for the fabrication of embedded capacitance materials

2019 ◽  
Vol 30 (8) ◽  
pp. 7743-7751 ◽  
Author(s):  
Fengwei Wang ◽  
Xu Zhou ◽  
Weikai Zheng ◽  
Gang Jian ◽  
Rui Liu ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Solvent Composition ◽  
Film Forming ◽  
Embedded Capacitance

Effect of Different Carbon Materials on the Conductivity of Epoxy Resin Conductive Coatings

2021 ◽  
Vol 1020 ◽  
pp. 164-169
Author(s):  
Guang Zhao Li ◽  
La Jun Feng ◽  
Zhe Zhai ◽  
Fang Fang Wang
Keyword(s):  
Epoxy Resin ◽  
Electrostatic Force ◽  
Theory Model ◽  
Epoxy Coating ◽  
Conductive Coatings ◽  
Conductive Coating ◽  
Multi Walled Carbon Nanotube ◽  
Film Forming ◽  
Conductive Mechanism ◽  
Conductive Particles

In this work, the conductive coating was prepared by electrostatic spraying with graphene and Multi-walled carbon nanotube (MWCNTs) as conductive medium and epoxy resin powder as film-forming material, in order to solve the pro·blem of high content and uneven dispersity of conductive particles in conductive coatings prepared by brushing method. The resistance of the coating was measured by four probe method, the dispersity of conductive particles in the coating was analyzed by scanning electron microscope (SEM), and the conductive mechanism of the coating was analyzed by percolation theory model. The results show that the conductive particles can be dispersed evenly in the whole coating by electrostatic force. Meanwhile, the electrostatic force can also stretch the conductive particles in the coating along the direction of the thickness of that. The flake graphene is vertically arranged in the coating, and the curled MWCNTs forms the conductive network of "island-bridge" structure. The conductive particles laped each other to form a conductive path, which greatly reduced the content of conductive particles. The seepage threshold of graphene conductive coating was only 1.5 wt.%, which lower than that of the MWCNTs conductive coating, which is 3 wt.%. The resistance of epoxy coating containing with 0.5 wt.% graphene is 3397 Ω·m, and that of epoxy coating containing with 0.5 wt.% MWCNTs is 1049 Ω·m.

The Advantages of Basalt Glass Flake Coating for Marine Anticorrosion

2011 ◽  
Vol 332-334 ◽  
pp. 1619-1622 ◽  
Author(s):  
Hua Wu Liu ◽  
Kai Fang Xie ◽  
Zong Bin Yang ◽  
Hong Ming Dai
Keyword(s):  
Epoxy Resin ◽  
Ocean Engineering ◽  
Basalt Glass ◽  
High Adhesion ◽  
Film Forming ◽  
Epoxy Resin Coating ◽  
Marine Engineering ◽  
Glass Flake ◽  
Chinese Marine ◽  
Engineering Glass

Harsh marine environment makes anticorrosion to be a technical challenge of ocean engineering. Glass flake, as the pigment for under seawater coating, is required by anticorrosion standard and has been the bottleneck of Chinese marine technology. Basalt planar glass flake is novel anticorrosive pigment developed by the authors, which is environmentally friendly, strong, heavy-duty anticorrosion, water impermeable, anti-weather and UV blocking and superior to the traditional c-glass flake and basalt glass-ceramic flake. Epoxy resin has excellent properties of film forming, corrosion resistance, low permeability, high adhesion and dimensional stable. Hence, basalt glass flake reinforced epoxy resin coating has significant advantages in the marine engineering, in terms of anticorrosion.

scholarly journals Research of the biostability of organic bases of paints for wood

2021 ◽  
pp. 11-18
Author(s):  
Sergii Guzii ◽  
Ihar Bazhelka ◽  
Anastasiya Kanavalava
Keyword(s):  
Aspergillus Niger ◽  
Epoxy Resin ◽  
Organic Film ◽  
Minimum Level ◽  
Time Intervals ◽  
Mycelium Growth ◽  
Organic Bases ◽  
Subsequent Time ◽  
Film Forming ◽  
Lesion Level

The biostability of organic film-formers of paints and varnishes intended for staining wood to the action of the fungus Aspergillus niger was studied. It was found that in Sabouraud's environment on days 7, 14 and 21 from the beginning of infection, the epoxy hardener is characterized by the minimum level of damage, respectively, 1, 1.6 and 2.4 points; alkyd film former has 2 points, and in subsequent time intervals 3.7 points; epoxy resin on day 7 is characterized by a lesion level of 1.7 points, on the following days of exposure – 4 points; pentaphthalic film former, respectively, 2.7, 3.7 and 4 points. According to the degree of resistance in the Sabouraud environment, organic film-formers of wood paints can be ranked as follows: epoxy (hardener)>alkyd>epoxy resin>pentaphthalic>organosilicon. It is shown that in the environment of Czapek on 7, 14 and 21 days from the beginning of infection, the minimum level of damage is characterized by an epoxy hardener, respectively, 2, 2.3 and 3 points; pentaphthalic film former, respectively, 2 and 3 points; alkyd film former, respectively, 2.4, 3.7 and 4 points; epoxy resin on day 7 is characterized by a lesion level of 3 points, on the following days of exposure – 4 points. According to the degree of resistance in the environment of Czapek, organic film-forming agents for wood paints can be ranked as follows: epoxy (hardener)>pentaphthalic>alkyd>epoxy resin>organosilicon. Organosilicon film-formers were most intensively affected by the fungus both 7 days after exposure and at a later time, reaching the maximum values of the lesions – 4 points. During the test period, no zones of mycelium growth inhibition were observed in the studied organic bases

scholarly journals Barrier properties of “epoxy resin - amine hardener” film-forming systems

2021 ◽  
Vol 66 (2) ◽  
pp. 169-179
Author(s):  
A. N. Potapchik ◽  
A. L. Egorova
Keyword(s):  
Water Absorption ◽  
Epoxy Resin ◽  
Barrier Properties ◽  
Open Circuit ◽  
Properties Of Coatings ◽  
Epoxy Coatings ◽  
Simple Method ◽  
Protective Properties ◽  
Low Viscosity ◽  
Film Forming

The article examines the physicomechanical and barrier properties of non-pigmented epoxy coatings formed from various film-forming systems based on epoxy resins and amine hardeners. The barrier properties of the coatings were evaluated by the nature of the frequency dependencies of the capacitance and resistance of the painted metal plates in contact with a 3 % aqueous solution of sodium chloride, and also by the magnitude of the displacement of the open circuit potential of the painted electrode compared to unpainted. It was experimentally established that a higher content of gel fraction is observed for coatings formed from low-viscosity film-forming compositions. It is shown that the physicomechanical and protective properties of epoxy coatings depend on the content of the functional groups in the epoxy resin and the nature of the amine hardener. It was found that to obtain coatings with better properties, it is preferable to use amine hardeners characterized by a low content of amine groups and a reduced proportion of secondary amino groups. A relationship was found between the protective properties of coatings and their water absorption. It is proposed to use the characteristics of water absorption of coatings as a simple method for assessing their barrier properties. The technological aspects of the use of the studied film-forming systems in the production of anticorrosive paints are considered. The advantages of using low viscosity epoxy film-forming systems without inert solvents are shown. 

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

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