scholarly journals Complex-modified basalt plastics

2018 ◽  
Vol 80 (2) ◽  
pp. 297-301 ◽  
Author(s):  
Y. A. Kadykova ◽  
P. A. Bredikhin ◽  
S. V. Arzamastsev ◽  
S. G. Kalganova
Keyword(s):  
Corona Discharge ◽  
Mechanical Characteristics ◽  
Chemical Interaction ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
Hydroxyl Groups ◽  
Regression Equations ◽  
Physical Chemical ◽  
The Creation ◽  
Full Factorial

In view of the fact that the creation and development of the production of new polymers practically does not occur, the modification of known materials, the creation of polymer composites filled with various substances is today one of the priority directions in the creation of new polymeric materials. In this paper, the possibility of increasing the reactivity by processing corona discharge of large-capacity polymer-polyethylene when filled with modified basalt. The method of full factorial experiment, regression equations, analysis of which showed a prevailing influence of DC corona discharge on the physico-mechanical characteristics of polymeric composite materials. The optimal ratio of the components of the composite material and the current during the processing of polyethylene corona discharge were chosen by gradient method. The prospects and expediency of obtaining complex-modified basalt plastics on the basis of low-pressure polyethylene treated with corona discharge are proved, since all physical, chemical and mechanical properties of polyethylene composites are increased. The method of infrared spectroscopy shows that in a complex-modified basalt plastic there are practically no groups of hydroxyl groups, the intensity of peaks of methylol groups and peaks –Si-O-Si-is significantly reduced, which indicates the chemical interaction of polyethylene treated with corona discharge and modified basalt.

Obtaining and Characterisation of Starch-Based Edible Films Incorporating Honey, Propolis and Bee Bread

2019 ◽  
Vol 23 (2) ◽  
pp. 193-198
Author(s):  
Monica Mironescu ◽  
Laura Fratila ◽  
Alexandru Hupert ◽  
Ion Dan Mironescu
Keyword(s):  
Water Activity ◽  
Mechanical Characteristics ◽  
Edible Films ◽  
Ash Content ◽  
Colour Intensity ◽  
Sensorial Analysis ◽  
Physical Chemical ◽  
Control Film ◽  
Bee Bread

Abstract This research investigates the physical-chemical, sensorial and mechanical characteristics of starch-based edible films incorporating three types of bee hive products: honey, propolis and bee bread, in concentrations varying from 1% to 3%, reported to starch. The results indicates an increasing of films moisture, water activity, ash content and acidity, in the order: honey<propolis<bee bread, all values increasing with the increasing of hive products percentage into the control film; aw is remaining at very low values, under 0.4. Sensorial analysis indicated honey as the better suited for improving taste and flavour and bee bread for increasing colour intensity of the films; the sensorial characteristics are maintained during 30 days of films storage, in all cases. Compared with the control starch-based film (which is elastic, brittle and hard), the films containing 2% bee hive products are elasto-plastic and more resistant to penetration, the resistance increasing in the order: bee bread<propolis<honey.

scholarly journals The influence of technological parameters for the production of plasticized polyvinylbutyral films on their optical and physico-mechanical properties

2019 ◽  
pp. 7-8
Author(s):  
M. M. Egorov ◽  
V. I. Milov ◽  
M. K. Timin ◽  
T. P. Mukhina ◽  
V. S. Smirnov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mathematical Analysis ◽  
Polyvinyl Butyral ◽  
Factorial Experiment ◽  
Regression Equations ◽  
Technological Parameters ◽  
Full Factorial Experiment ◽  
Effect Of Pressure ◽  
Direct Pressing ◽  
Full Factorial

The effect of pressure, temperature and time during direct pressing on the strength and optical characteristics of adhesive plasticized polyvinyl butyral films is studied. A mathematical analysis of the results of a full factorial experiment is carried out and the regression equations are derived.

scholarly journals The Influence of Composite Polymeric Materials Topology Over the Shearing Modulus Using Virtual Instruments

2018 ◽  
Vol 55 (4) ◽  
pp. 524-530
Author(s):  
Marinela Marinescu ◽  
Larisa Butu ◽  
Claudia Borda ◽  
Delicia Arsene ◽  
Mihai Butu
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Virtual Instrument ◽  
Mechanical Characteristics ◽  
Polymeric Materials ◽  
Mechanical Impedance ◽  
Impedance Analysis ◽  
Cross Linking ◽  
Labview Software ◽  
Different Temperatures

This study presents research regarding the calculation of the mechanical characteristics of composite polymeric materials. By using LabVIEW� software a virtual instrument was created used for monitoring in real time the process of cross-linking the composite polymeric materials. The experiments were realized based on composite materials containing epoxy/fiberglass resin of different topologies. By means of the virtual instrument and of a sensor created based on the mechanical impedance analysis, implanted in the composite material, it was determined the G shearing module of the composite material at different temperatures.

scholarly journals Corona Discharge Properties Near Metal and Dielectric Surface

2020 ◽  
Vol 9 (3) ◽  
pp. 3662-3665
Keyword(s):  
Sulfuric Acid ◽  
Corona Discharge ◽  
Discharge Current ◽  
Ferrous Metal ◽  
Dielectric Surface ◽  
Electrical Characteristics ◽  
Corona Discharges ◽  
Industrial Gases ◽  
The Creation ◽  
Discharge Method

This following research of the properties of a coronary discharge has a serious impact on the study of metallurgy. There are a lot of cases of practical use of the corona discharge functions. An example is the creation of electrostatic precipitators for the purification of industrial gases from solid and liquid particles. Using the corona discharge method, for example, smoke is cleaned in the production of sulfuric acid, air in non-ferrous metal foundries and other harmful industries. Shape of the corona discharge made utilizing cone shaped and round and hollow terminals was examined. The most electrical characteristics of discharge of this type are decided. Corona discharges are characterized by weak currents within the extend of one microampere at voltages on the arrange of 10 kilovolts and adequately week gleam discharge. Electric fluctuations within the discharge current circuit within the extend 1 kHz-120 MHz are enlisted. To think about the oscillatory forms, there were used electric and attractive tests, signals from which were sent to the Tektronix TDS 2024B oscilloscope working within the frequency analyzer mode. The electrical tests were spoken to by metal poles 1-10 cm in length and 4-5 mm in diameter. As magnetic tests, there were used coils (diameter 2-4 mm, number of turns 70-140, wire thickness 0.1 mm) set in protective dielectric walled in areas. These tests were located at a separate of 0.5-1.0 m from the release. Possible waves in plasma are suggested to explain these oscillations.

scholarly journals A Robust, Tough and Multifunctional Polyurethane/Tannic Acid Hydrogel Fabricated by Physical-Chemical Dual Crosslinking

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 239 ◽  
Author(s):  
Jie Wen ◽  
Xiaopeng Zhang ◽  
Mingwang Pan ◽  
Jinfeng Yuan ◽  
Zhanyu Jia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Hydrogen Bonds ◽  
Tannic Acid ◽  
Hydroxyl Groups ◽  
Self Healing ◽  
Physical Chemical ◽  
Biomedical Field ◽  
Physical Crosslinking

Commonly synthetic polyethylene glycol polyurethane (PEG–PU) hydrogels possess poor mechanical properties, such as robustness and toughness, which limits their load-bearing application. Hence, it remains a challenge to prepare PEG–PU hydrogels with excellent mechanical properties. Herein, a novel double-crosslinked (DC) PEG–PU hydrogel was fabricated by combining chemical with physical crosslinking, where trimethylolpropane (TMP) was used as the first chemical crosslinker and polyphenol compound tannic acid (TA) was introduced into the single crosslinked PU network by simple immersion process. The second physical crosslinking was formed by numerous hydrogen bonds between urethane groups of PU and phenol hydroxyl groups in TA, which can endow PEG–PU hydrogel with good mechanical properties, self-recovery and a self-healing capability. The research results indicated that as little as a 30 mg·mL−1 TA solution enhanced the tensile strength and fracture energy of PEG–PU hydrogel from 0.27 to 2.2 MPa, 2.0 to 9.6 KJ·m−2, respectively. Moreover, the DC PEG–PU hydrogel possessed good adhesiveness to diverse substrates because of TA abundant catechol groups. This work shows a simple and versatile method to prepare a multifunctional DC single network PEG–PU hydrogel with excellent mechanical properties, and is expected to facilitate developments in the biomedical field.

scholarly journals Development of PVC films, resistant mold influence

2019 ◽  
Vol 97 ◽  
pp. 02040
Author(s):  
Aliya Mazitova ◽  
Albina Maskova ◽  
Guliya Aminova
Keyword(s):  
Polyvinyl Chloride ◽  
Phthalic Anhydride ◽  
Adipic Acid ◽  
Mechanical Characteristics ◽  
Negative Impact ◽  
Polymeric Materials ◽  
Practical Application

Along with the use of plasticizers in the development of polymeric materials with specific properties, special substances such as fungicides are also used because of the negative impact on the polyvinyl chloride materials of microorganisms. In the present work, the possibility of practical application of butylbutoxyethyl phthalate (BBOEP) and dibutoxyethyl adipate (DBOEA) as plasticizers, and 4-amino-1,4,5,6-tetrahydro-1,2,4-triazinone-5 as a fungicide, in PVC films. The first additive was obtained by the esterification of phthalic anhydride (adipic acid) with hydroxyethyllylated butanol. The second additive was obtained on a base of ethyl monochloroacetate. According to the conducted experiments, it was it was found that when exposed to mold fungi, some physic-mechanical characteristics of plastic compounds deteriorate. During the study of the resistance to fungi of plastic compounds, it was found that compositions made on the basis of PVC with BBOEP have got high funginertness, while compositions prepared with using of DBOEA turned out to be unstable against to microorganisms. For the prevention infection by the fungus of the obtained plastic compounds based on adipic acid, a proposed fungicide was used. Primary studies have shown that DBOEA with the addition of the fungicide for resistance to fungi is not inferior to BBOEF.

The Use of Time-Temperature Superposition Techniques to Forecast Creep Behavior in Engineering Plastics

1988 ◽  
Vol 142 ◽  
Author(s):  
B. J. Overton ◽  
C. R. Taylor ◽  
J. W. Shea
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Polymeric Materials ◽  
Temperature Dependent ◽  
Complete Understanding ◽  
Use Of Time ◽  
Engineering Plastics ◽  
Temperature Superposition ◽  
Engineering Designs ◽  
Computer Based

AbstractA complete understanding of the time-temperature dependent, viscoelastic mechanical properties of polymeric materials is essential for their successful application to engineering designs. We describe a computer-based system for acquiring, reducing and storing the mechanical properties of polymers, from which the useful forms of the mechanical characteristics may easily be reproduced and compared. We provide several examples illustrating the variety of ways in which these properties are utilized to forecast the performance of polymeric components of engineering designs under extreme field conditions.

The effects of textile reinforcements on the protective properties of self-healing polymers intended for safety gloves

2020 ◽  
Vol 90 (17-18) ◽  
pp. 1974-1986
Author(s):  
Emilia Irzmańska ◽  
Anna Bacciarelli-Ulacha ◽  
Agnieszka Adamus-Włodarczyk ◽  
Anna Strąkowska
Keyword(s):  
Healing Process ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
Economic Loss ◽  
The Self ◽  
Raw Material ◽  
Protective Equipment ◽  
Self Healing ◽  
Hybrid Molecules ◽  
The Impact

In the environment where glove material is exposed to harmful chemicals, hazards related to faster penetration of dangerous substances into the glove interior may cause microdamage. One of the solutions to overcome this problem is to use the self-healing polymeric materials that can minimize economic loss and accidents in the workplace. The current work aims to present the impact of different types of textile reinforcement on the effectiveness and efficiency of the self-healing process of methyl vinyl silicone rubber containing hybrid molecules with an inorganic silsesquioxane intended for use on all-rubber gloves. Three knitted fabrics with a similar structure and differentiated raw material composition were selected: polyamide, cotton–polyamide, and cotton. Evaluation of the self-healing process of the elastomeric composite to personal protective equipment was performed. For this purpose the assessment of the surface morphology of materials has been performed before and after the self-healing process. The implementation of knitted fabric into the polymeric composite in the tested samples allowed us to obtain the best results in all tests. The studied composite samples exhibited an increased resistance to three types of damage: penetration, abrasion and puncture. The samples also underwent the self-healing processes and regeneration after a proper conditioning period. Thus, the obtained results confirmed the possibility of using tested elastomeric composites in the construction of protective gloves and showed an effectivity of the self-healing process for the long-term usage of that protective equipment.

scholarly journals Influence of two-body abrasion and heat intensity on metal and non-metal materials used in agriculture

2016 ◽  
Vol 61 (No. 1) ◽  
pp. 40-46
Author(s):  
P. Valášek ◽  
J. Kejval ◽  
M. Müller ◽  
J. Cieslar
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Agricultural Production ◽  
Elevated Temperatures ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
Metallic Material ◽  
Composite Systems ◽  
Metal Materials ◽  
Materials Used

In the agro-complex, as well as in other sectors, the use of polymeric materials is one possible way forward in the innovation and development of machines and their parts. However, machine products place high demands on the materials from which they are made. Polymeric materials are currently able to compete in certain areas where metallic material would traditionally be used; however, one of their limiting characteristic is their ability to withstand elevated temperatures. This paper describes the hardness of polymeric materials when influenced by heat, generated during the double body abrasion. The paper also describes the abrasive wear of both polymers and polymeric composite systems, as well as cast iron, used in agricultural production. Heat intensity during the two-body abrasion results in a 28% fall of the composite systems hardness, to 18% fall of the Polyamid 6 hardness and to 13% fall of the Murtfeld hardness.

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