scholarly journals RESEARCH OF INFLUENCE OF CROSS-LINKING AGENTS ON CHARACTERISTICS OF SPATIAL GRID AND PROPERTIES OF URETHANE POLYMER

2018 ◽  
Vol 59 (7) ◽  
pp. 86
Author(s):  
Inna Slepchuk ◽  
Olga Ya. Semeshko ◽  
Yuliya G. Saribekova ◽  
Irina N. Kulish ◽  
Igor V. Gorokhov
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Organic Solvents ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Polymeric Films ◽  
Cross Linking ◽  
Glycidyl Ethers ◽  
Equilibrium Swelling ◽  
Spatial Grid

Results of study of influence of amount of functional groups of glycidyl ethers on characteristics of the spatial grid of crosslinked polyurethane polymer are presented. Parameters of a three-dimensional spatial grid of investigated samples of polymeric films and their physical and mechanical properties were determined by a method of equilibrium swelling in organic solvents.

scholarly journals Effect of Structural Differences on the Mechanical Properties of 3D Integrated Woven Spacer Sandwich Composites

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4284
Author(s):  
Lvtao Zhu ◽  
Mahfuz Bin Rahman ◽  
Zhenxing Wang
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Three Dimensional ◽  
Sheet Thickness ◽  
Physical And Mechanical Properties ◽  
Sandwich Composites ◽  
Computed Tomography Images ◽  
And Performance ◽  
Industrial Textiles ◽  
Load Conditions

Three-dimensional integrated woven spacer sandwich composites have been widely used as industrial textiles for many applications due to their superior physical and mechanical properties. In this research, 3D integrated woven spacer sandwich composites of five different specifications were produced, and the mechanical properties and performance were investigated under different load conditions. XR-CT (X-ray computed tomography) images were employed to visualize the microstructural details and analyze the fracture morphologies of fractured specimens under different load conditions. In addition, the effects of warp and weft direction, face sheet thickness, and core pile height on the mechanical properties and performance of the composite materials were analyzed. This investigation can provide significant guidance to help determine the structure of composite materials and design new products according to the required mechanical properties.

scholarly journals Interpenetrating Polymer Network Hydrogels Based on Gelatin and PVA by Biocompatible Approaches: Synthesis and Characterization

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eltjani-Eltahir Hago ◽  
Xinsong Li
Keyword(s):  
Mechanical Properties ◽  
Mtt Assay ◽  
Biomedical Applications ◽  
Polymer Network ◽  
Physical And Mechanical Properties ◽  
Morphological Characterization ◽  
Interpenetrating Polymer Network ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
New Approach

In this work, a new approach was introduced to prepare interpenetrating polymer network PVA/GE hydrogels by cross-linking of various concentration gelatin in the presence of transglutaminase enzyme by using the freezing-thawing cycles technique. The effects of freezing-thawing cycles on the properties of morphological characterization, gel fraction, swelling, mechanical, and MTT assay were investigated. The IPN PVA/GE hydrogels showed excellent physical and mechanical Properties. MTT assay data and the fibroblasts culture also showed excellent biocompatibility and good proliferation. This indicates that the IPN hydrogels are stable enough for various biomedical applications.

Physical and mechanical properties of sulfonated aromatic copolyimide membranes

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahmad Rabiee ◽  
Shahram Mehdipour-Ataei
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Physical And Mechanical Properties ◽  
Xrd Analysis ◽  
Polymeric Films ◽  
Solid Polymer ◽  
Plastic Behavior ◽  
Thermally Stable ◽  
Sem Micrograph ◽  
Ion Conducting

AbstractPhysical and mechanical properties of four series of chemically and thermally stable sulfonated copolyimides as ion-conducting ionomers for application in fuel cell membrane, depending on chemical structure of diamine monomers were studied. The physical and mechanical properties of solid polymer membranes including thermal stability, mechanical strength, water uptake, stability in water, crystallinity and morphology were evaluated. All the polymers were thermally stable. The XRD analysis and SEM micrograph revealed that the polymers were almost amorphous and hydrophobic-hydrophilic phase separation in polyimide did not occur. Use of flexible monomers such as 4,4'-oxydianiline (ODA) and 4,4'-(4-aminophenoxy) diphenylsulfone (APDS) in the hydrophobic sequences increased the plastic behavior compared to rigid polymers prepared from 4,4'-(5- amino-1-naphthoxy) diphenylsulfone (ANDS) and m-phenylenediamine (m-PDA). It was concluded that the properties of polymeric films were strictly dependent on chemical composition of monomers and molecular weight of copolymers.

scholarly journals Graphene Nanoplatelet- and Hydroxyapatite-Doped Supramolecular Electrospun Fibers as Potential Materials for Tissue Engineering and Cell Culture

2019 ◽  
Vol 20 (7) ◽  
pp. 1674 ◽  
Author(s):  
Vassilis Kostopoulos ◽  
Athanasios Kotrotsos ◽  
Kalliopi Fouriki
Keyword(s):  
Mechanical Properties ◽  
Cell Culture ◽  
Biomedical Engineering ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Supramolecular Polymer ◽  
Potential Candidate ◽  
Tissue Formation ◽  
Graphene Nanoplatelet ◽  
Electrospun Scaffolds

Porous and fibrous artificial extracellular matrices (ECM) called scaffolds are considered to be promising avenues of research in the field of biomedical engineering, including tissue fabrication through cell culture. The current work deals with the fabrication of new matrix-type scaffolds through electrospinning, in order to support future three-dimensional tissue formation. The selected material for the fabrication of these scaffolds was a supramolecular polymer (SP) that is based on ureiodypyrimidone hydrogen bonding units (UPy). More precisely, pure SP and modified electrospun scaffolds with (a) graphene nanoplatelets (GNPs), (b) hydroxyapatite (HA), and (c) a mixture of both were fabricated for the needs of the current study. The aim of this work is to engineer and to characterize SP electrospun scaffolds (with and without fillers) and study whether the introduction of the fillers improve the physical and mechanical properties of them. The obtained results indicate that doping the SP scaffolds with GNPs led to improved apparent mechanical properties while HA seems to slightly deteriorate them. For all cases, doping provided thinner fibers with a more hydrophilic surface. Taking together, these types of SP scaffolds can be further studied as potential candidate for cell culture.

Additive Manufacturing

2019 ◽  
pp. 165-183 ◽  
Author(s):  
Kamardeen Olajide Abdulrahman ◽  
Esther T. Akinlabi ◽  
Rasheedat M. Mahamood
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Processing Parameters ◽  
Metal Deposition ◽  
Layer By Layer ◽  
Laser Metal Deposition ◽  
Additive Process

Three-dimensional printing has evolved into an advanced laser additive manufacturing (AM) process with capacity of directly producing parts through CAD model. AM technology parts are fabricated through layer by layer build-up additive process. AM technology cuts down material wastage, reduces buy-to-fly ratio, fabricates complex parts, and repairs damaged old functional components. Titanium aluminide alloys fall under the group of intermetallic compounds known for high temperature applications and display of superior physical and mechanical properties, which made them most sort after in the aeronautic, energy, and automobile industries. Laser metal deposition is an AM process used in the repair and fabrication of solid components but sometimes associated with thermal induced stresses which sometimes led to cracks in deposited parts. This chapter looks at some AM processes with more emphasis on laser metal deposition technique, effect of LMD processing parameters, and preheating of substrate on the physical, microstructural, and mechanical properties of components produced through AM process.

Enhancement of the Mechanical Property of Apatite-Fiber Scaffold Using Type I-Collagen

2007 ◽  
Vol 361-363 ◽  
pp. 943-946
Author(s):  
S. Motojima ◽  
N. Igeta ◽  
Michiyo Honda ◽  
Nobuyuki Kanzawa ◽  
Mamoru Aizawa
Keyword(s):  
Mechanical Properties ◽  
Type I Collagen ◽  
Three Dimensional ◽  
Collagen Gel ◽  
Cross Linking ◽  
Type I ◽  
Collagen Scaffolds ◽  
Chemically Modified ◽  
Strength Tests ◽  
Fiber Scaffolds

We have successfully fabricated apatite-fiber scaffolds (AFSs) that enable three-dimensional cell culture. The AFSs possessing large pores of 100~250 μm and micro pores of about 5 μm were fabricated by firing the green compacts consisting of the single-crystal apatite fibers and the carbon beads with a size of 150 μm. In order to enhance the mechanical properties of the AFSs, we have improved the process of AFS fabrication: Collagen gel (type I) solutions were introduced into the pores in the scaffolds; in addition, the resulting apatite/collagen scaffolds were chemically modified by thermally dehydrated cross-linking. Actually, the results of compressive strength tests show that the value of the AFS with chemically cross-linked I-collagen was about twice as high as that of the conventional AFS without I-collagen. We conclude that combination of I-collagen and thermal dehydrated cross-linking is effective for enhancement of the mechanical properties of AFSs.

Study on Three-Dimensional Reconstruction of Macro/Meso-Structure Evolution of Expansive Soils with CT-Triaxial Apparatus

2012 ◽  
Vol 238 ◽  
pp. 422-426 ◽  
Author(s):  
Xian Li ◽  
Shi Ji Wang ◽  
Zheng Han Chen
Keyword(s):  
Mechanical Properties ◽  
Computerized Tomography ◽  
Expansive Soils ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Structure Evolution ◽  
Three Dimensional Reconstruction ◽  
Triaxial Apparatus ◽  
Dimensional Reconstruction ◽  
Shearing Strength

A program is used to reconstruct the computerized tomography (CT) images of expansive soils in the manuscript. The physical and mechanical properties of expansive soils can be researched accurately and visually. In the experiment, the CT-triaxial apparatus is used to research the shearing strength of expansive soils with artificial holes in different conditions of suctions and net pressures. The three-dimensional reconstruction is successful and considerable. The principle of program is easy and convenient, and it can be learned fast and directly by those who are not major in computer. This technique will have a better prospect in geotechnical engineering.

scholarly journals The Effect of Waste Fodder Potato Proteins on the Mechanical Properties of Carboxylated Acrylonitrile-Butadiene Rubber

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Mirosława Prochoń ◽  
Anita Przepiórkowska ◽  
Yves-Herve Tshela Ntumba
Keyword(s):  
Mechanical Properties ◽  
Zinc Oxide ◽  
Cross Linking ◽  
Butadiene Rubber ◽  
Current Investigation ◽  
Rubber Compound ◽  
Acrylonitrile Butadiene Rubber ◽  
Rubber Compounds ◽  
Equilibrium Swelling ◽  
Starch Industry

The current investigation treats about the influence of waste fodder potato proteins (WFPP) recovered from the starch industry on the mechanical-properties of carboxylated acrylonitrile-butadiene rubber (XNBR). WFPP were characterized and used as a filler of the above mentioned XNBR rubber without or after blending with zinc oxide. The obtained rubber compounds were cured, and mechanical properties such as tensile strength, hardness, and cross-linking density were investigated. It was found that the introduction of WFPP previously blended with zinc oxide into rubber compound increases the cross-linking density of the obtained composites, compared with the vulcanizate without protein, which in turn increases the mechanical properties of the obtained vulcanizates. That occurs thanks to the formation of ion nodes, as testified by equilibrium swelling. The introduction of WFPP into the elastomer matrix also increases the susceptibility of the elastomer to biodecomposition.

scholarly journals STUDY OF RECEIVING WOOD AND PLANT PLASTICS WITHOUT BINDERS IN THE PRESENCE OF CATALYSTS OF POLYOXOMETALLATES TYPE

2018 ◽  
Vol 8 (1) ◽  
pp. 132-138
Author(s):  
Виктор Бурындин ◽  
Viktor Buryndin ◽  
Лариса Бельчинская ◽  
Larisa Belchinskaya ◽  
Андрей Савиновских ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Hot Pressing ◽  
Raw Materials ◽  
Flexural Modulus ◽  
Chemical Activation ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Raw Material ◽  
Plastic Properties

The possibility of obtaining wood and plant plastics without a binder (WP-WB) in the presence of a catalyst of man-ganese-containing sodium vanadomolybdophosphate has been investigated. The use of this catalyst makes it possible to reduce the temperature of hot pressing in closed molds from 1,800°C to 1,600°C. The fractional composition of the initial press raw material influences physical and mechanical properties of WP-WB. Higher values of the plastic properties are obtained by using a 0.7 mm fraction, which is associated with an increased specific surface area of the particles compared to 1.3 mm particles. The results has showed that the samples obtained by using the catalyst have increase in strength properties (flexural strength, flexural modulus, hardness) at lower pressing temperature, but reduction of water resistance performance has been observed . This is explained by the increase in the content of functional groups when using a catalyst. The process of obtaining plastic can be broken down into two successive stages: the first is hydrothermal destruction of lignin-carbohydrate complex (initial moisture of the press raw material is 12%, the temperature of hot pressing in closed molds is 160 ... .180 ° C) and partial chemical activation of lignin as a result of hydrogen peroxide and catalyst application; the second stage - formation of plastic with the formation of a network structure due to the formed functional groups. It is established that the values of physical and mechanical properties of WP-WB are higher than those of plastic obtained on the basis of plant raw materials (PP-WB). This can be explained by the fact that lignin of coniferous species has the guaiacylpropane structure, while plant raw material has a hydroxyphenylpropane structure

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