scholarly journals Correlation between some technological parameters and properties of composite material based on recycled tires and polymer binder

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Renate Plesuma ◽  
Laimonis Malers
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Compressive Stress ◽  
Apparent Density ◽  
Compressive Modulus ◽  
Polymer Binder ◽  
Molding Pressure ◽  
Technological Parameters ◽  
Formation Conditions

AbstractThe present article is dedicated to the determination of a possible connection between the composition, specific properties of the composite material and molding pressure as an important technological parameter. Apparent density, Shore C hardness, compressive modulus of elasticity and compressive stress at 10% deformation was determined for composite material samples. Definite formation conditions – varying molding pressure conditions at ambient temperature and corresponding relative air humiditywere realized. The results obtained showed a significant effect of molding pressure on the apparent density, mechanical properties of composite material as well as on the compressive stress change at a cyclic mode of loading. Some general regularities were determined - mechanical properties of the composite material, as well as values of Shore C hardness increases with an increase of molding pressure.

Polyurethane Binder Mechanical Properties under Different Crosslinking Conditions

2016 ◽  
Vol 721 ◽  
pp. 3-7 ◽  
Author(s):  
Renate Plesuma ◽  
Laimonis Malers
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Elasticity Modulus ◽  
Polymer Binder ◽  
Direct Influence ◽  
Air Humidity ◽  
Crosslinking Degree ◽  
Scrap Tires ◽  
Elongation At Break ◽  
Relative Air Humidity

Mechanical properties of polyurethane type polymer binder with selected reactivity, used for production of the composite material based on scrap tires, were investigated under different crosslinking conditions: temperature, relative air humidity, hardening time. Shore C hardness, tensile strength and elongation at break were selected as main parameters, reflecting crosslinking degree of the prepared polymer binder films. DMA investigation of the samples in tensile mode of loading were realized to clear up influence of deformation circumstances on storage and loss components of the elasticity modulus. Strong correlation between mentioned above mechanical properties of the polymer binder and selected crosslinking conditions of the polymer were obtained. It was affirmed previously, that crosslinking degree of the polymer binder in the same time has direct influence also on mechanical properties of the composite material.

Tensile and Compressive Behaviours and Properties of a Bone Analogue Biomaterial

2005 ◽  
Vol 284-286 ◽  
pp. 693-696 ◽  
Author(s):  
Min Wang ◽  
C.L. Au ◽  
P.K. Lai ◽  
William Bonfield
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Deformation Behaviour ◽  
Compressive Modulus ◽  
Tensile Fracture ◽  
Compressive Yield Strength ◽  
Compression Tests ◽  
Bone Replacement ◽  
Loading Modes ◽  
Natural Composite

For the purpose of mimicking the structure and matching mechanical properties of human cortical bone, a natural composite material, hydroxyapatite (HA) reinforced high density polyethylene (HDPE) has been developed as a bioactive, analogue material for bone replacement. This synthetic composite material is now in clinical use. To understand the deformation behaviour and determine mechanical properties of HA/HDPE composite under different loading modes and loading conditions, tensile and compression tests were performed in the current investigation. It was observed that under tension, HA/HDPE composite exhibited two types of deformation behaviour: ductile and brittle. Under compression, the composite deformed in a ductile manner and did not fracture at high compressive strains. It was found that an increase in HA content resulted in increases in Young’s modulus, compressive modulus, tensile strength and compressive yield strength of the composite. A higher strain rate led to higher modulus and strength values and lower tensile fracture strains of the composite.

The control and optimization of the curing process of epoxy coatings: a case of poly(glycidoxy siloxane) resins

2016 ◽  
Vol 36 (8) ◽  
pp. 819-827
Author(s):  
Tomasz Jeliński ◽  
Piotr Cysewski ◽  
Edwin Makarewicz
Keyword(s):  
Mechanical Properties ◽  
Degree Of Crystallinity ◽  
Curing Process ◽  
Technological Parameters ◽  
Properties Of Coatings ◽  
Important Indicator ◽  
Curing Conditions ◽  
Amine Curing Agent ◽  
Amine Curing

Abstract Coatings from poly(glycidoxy siloxane) resins were developed and their mechanical properties examined. Three different resins with varying numbers of methyl siloxane and glycidyl siloxane units were tested. Crystallinity was found to be a very important indicator of the mechanical properties of coatings, as the parameters such as cupping and hardness were linearly dependent on the degree of crystallinity of coatings. The method involving the spectrophotometric determination of unbounded amine curing agent was successfully applied as a way of optimizing the curing process both for expected mechanical properties and for ecological aspect. It was found that the resin with 50 methyl siloxane and 25 glycidyl siloxane units was the most appropriate for technological use because of the preferred mechanical properties and stability of technological parameters. Interestingly, this type of resin was characterized by the lowest degree of crystallinity. The curing conditions leading to the optimal product corresponded to 30 min of curing at 120°C or 20 min at 140°C. Under such conditions, the amount of released unbounded amine was the lowest. It was also found that poly(glycidoxy) siloxane resins may be ecologically valuable since the release of amine from this type of resins is smaller than that from a typical epoxy resin.

scholarly journals On-going geocontrol while mounting anchors

2019 ◽  
pp. 72-77
Author(s):  
G.V. Babiiuk ◽  
V. F. Puntus
Keyword(s):  
Mechanical Properties ◽  
Real Time ◽  
Rapid Determination ◽  
Technological Parameters ◽  
Uniaxial Compression Strength ◽  
Geotechnical Monitoring ◽  
Time Determination ◽  
Definition Of ◽  
Drilling Time

Purpose. Development of method for rocks mechanical properties rapid determination by the fixation of 1m borehole net drilling time. Methodology. Determination of mechanical properties of rocks (uniaxial compression strength) in real-time mode using an automated geocontrol system. Findings. A method for rapid determination of rocks properties and methodology for anchor production mounting process governance have been developed. Scientific novelty. Real-time determination of the deformation and strength characteristics of rocks based on the correlation between borehole net drilling time and the coefficient of the strength of the prof. M.M. Protodyakonov. Practical value. Definition of technological parameters in anchor production mounting process. Keywords: method, strength, rocks, drilling speed, drilling time, hole, anchor, geotechnical monitoring.

scholarly journals Hydroxyapatite/Polyvinyl Alcohol Composite In Situ Synthesis for Hydrogel Formation

2016 ◽  
Vol 721 ◽  
pp. 202-207 ◽  
Author(s):  
Anna Vojevodova ◽  
Dagnija Loca
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Polyvinyl Alcohol ◽  
Bone Tissue ◽  
Average Crystallite Size ◽  
Technological Parameters ◽  
Homogenization Time ◽  
Chemical Purity ◽  
The Impact

It is well known that polyvinyl alcohol hydrogel-based (PVA-H) biomaterials are promising materials for damaged articular cartilage replacement, but their application for bone tissue engineering is restricted due to insufficient mechanical properties. Thus, to meet the demands of the bone substitute material, PVA-H are reinforced with hydroxyapatite (HAp) crystals. The current research is focused on the preparation of nanosized hydroxyapatite/polyvinyl alcohol (n-HAp/PVA) composite material that mimics the microstructure and mechanical properties of natural bone tissue. The aim of this work is to determine the impact of various technological parameters of n-HAp/PVA composite in situ synthesis on the chemical purity of final product. Obtained results confirmed that the main inorganic phase of the composite material is HAp with an average crystallite size of 20.39 nm, however β-tricalcium phosphate (β-TCP) and CaO phases are also present. Obtained results showed that it is possible to decrease the amount of potentially harmful by-products, e.g. CaO in the composite material from 1.57wt% to 0.32wt% by increasing the homogenization speed of starting suspension from 400 rpm up to 7000 rpm, though the main influence on the obtained products chemical purity has 5wt% polyvinyl alcohol aqueous solution. Based on the results, it is concluded that the combination of starting suspension stirring temperature, homogenization speed and homogenization time of 23°C, 7000 rpm and 2 min, respectively, allows to obtain nanocomposite with the lowest amount of impurities (HAp: 98.08wt%; β-TCP: 1.60wt%; CaO: 0.32wt%).

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