The Effect of Wear Rate on Polymeric Composites Reinforced Nanoclays

2021 ◽  
Author(s):  
Khalid Mohammed Khalifah
Keyword(s):  
Wear Rate ◽  
Epoxy Resin ◽  
Unsaturated Polyester ◽  
Temperature Stability ◽  
Hard Disk ◽  
Polymeric Composites ◽  
Test Duration ◽  
Weight Percentage ◽  
Before And After ◽  
Submerged Conditions

This research aims to study the addition of nanoclays on unsaturated polyester (UP) and epoxy resin (EP) as filling and by weight percentage (2%, 4% and 6%) to this mixture and then study the extent of the effect of this addition on wear rate of the composites’ material where three loads were adopted (10, 15 and 20[Formula: see text]N), respectively, on the iron hard disk (269 HB) and copper hard disk of 111[Formula: see text]HB for the resin before and after adding the clays, where the approved sliding velocities were 4.1887, 3.1415 and 2.0943[Formula: see text]m/sec, respectively, and the test duration was 10 min on the test disc. Immersion of samples in the water for 2, 4, 6 and 8 weeks showed a clear improvement in the wear rate and tear values of dry and submerged conditions in a water under different conditions of load change, slipping speed, time and temperature stability after adding the nanoclays to the polymer.

scholarly journals Wear rate of epoxy resin reinforced with multi walls carbon nanotubes

2019 ◽  
Vol 17 (40) ◽  
pp. 1-10
Author(s):  
Ayad Qabash Hameed
Keyword(s):  
Carbon Nanotubes ◽  
Wear Rate ◽  
Epoxy Resin ◽  
Natural Condition ◽  
Applied Load ◽  
Base Solution ◽  
Before And After

In this study, nanocomposites have been prepared by addingmultiwall carbon nanotubes (MWCNTs) with weight ratios (0, 2, 3,4, 5) wt% to epoxy resin. The samples were prepared by hand lay-upmethod. Influence of an applied load before and after immersion insodium hydroxide (NaOH) of normality (0.3N) for (15 days) atlaboratory temperature on wear rate of Ep/MWCNTsnanocomposites was studied. The results showed that wear rateincreases with increasing the applied load for the as prepared andimmersed samples and after immersion. It was also found that epoxyresin reinforced with MWCNTs has wear rate less than neat epoxy.The sample (Ep + 5wt% of MWCNTs) has lower wear rate. Theimmersion effect in base solution led to increase in wear rate valuesfor all samples compared to natural condition.

scholarly journals EROSION WEAR AND HARDNESS SHORE D OF EPOXY RESIN FILLED WITH PISTACHIO POWDER

2021 ◽  
Vol 21 (1) ◽  
pp. 26-34
Author(s):  
Hwazen Salam Fadhil ◽  
Rusul Salah Hadi
Keyword(s):  
Wear Rate ◽  
Epoxy Resin ◽  
Room Temperature ◽  
Erosion Wear ◽  
Weight Percentage ◽  
Wear Rates ◽  
Pistachio Shell ◽  
Ductile Behavior ◽  
Shell Powder ◽  
Absorption Percentage

In this research, erosion wear rate and hardness shore D for polymer biocomposite materials were investigated. The present bio-composites made up of differing weight percentage of pistachio shell powder (0%, 5%, 7%, and 9%) with epoxy resin was prepared by hand layout method. The erosion wear rates for bio composites obtained with under constant factors (10 hours, 60º impingement angles, sand silica particles 850μm, standoff distance 23 cm, flow rate 45 L/min, room temperature, nozzle diameter 4mm and pump diameter 50 mm). Results show that the specimen (epoxy + 9% pistachio shell powder) has the best erosion wear rate resistance and hardness shore D compared with other specimens, also the specimen reinforced by 9% pistachio shell have the lower density and highest water absorption percentage and it is found that the improving percentage for the this specimen in hardness is (11.5%) and in erosion wear rate is (775%). The study reveals that the addition of pistachio shell powder to the epoxy reduces its erosion wear rate and semi ductile behavior.

scholarly journals A Study of Wear Rate Epoxy Resin filled with SiO2 particle and Glass fibers

2011 ◽  
Vol 8 (2) ◽  
pp. 689-693
Author(s):  
Baghdad Science Journal
Keyword(s):  
Wear Rate ◽  
Epoxy Resin ◽  
Applied Load ◽  
Rate Increase ◽  
Glass Fibers ◽  
Load Level ◽  
Sio2 Particle ◽  
Weight Percentage ◽  
Reinforcing Particles ◽  
Hardness Increase

This research is devoted to study the effect of different in weight percentage of Sio2 particles and glass fibers (5, 10, 15, 20) wt. % on the wear rate epoxy resin. The results show that the value of hardness increase with the increase for the weight percentage of reinforcing particles and fibers, while the wear rate decrease with the increase the load level of the reinforcing particles and fibers . The largest value of the hardness, and the lowest value of the wear rate for epoxy reinforced with 20% of SiO2, the wear rate increase in general with increasing the applied load.

scholarly journals Study on the Friction and Wear Performance of Lightly Loaded Reciprocating Carbon/Aramid-Based Composites

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yangyang Zhao ◽  
Guoyuan Zhang ◽  
Maotan Liang ◽  
Qunfeng Zeng
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Epoxy Resin ◽  
Cyanate Ester ◽  
Carbon Cloth ◽  
Wear Performance ◽  
Preparation Methods ◽  
Before And After ◽  
Engineering Significance ◽  
Surface Morphologies

The preparation methods of T300 carbon cloth- and aramid cloth-reinforced epoxy resin and cyanate ester were proposed, and four kinds of composite samples were obtained. The friction coefficient and wear rate under different test times and loads were obtained using a reciprocating pin-disk tribology tester. The tribology pairs included pins or sliding blocks made from different metals (45 steel and brass) and the disk samples of the composites. The test results showed that the friction coefficients of the T300 carbon cloth- (T300/4211 and T300/BS-4) and aramid cloth- (aramid/4211 and aramid/BS-4) reinforced epoxy resin or cyanate ester changed from 0.09 to 0.3 and were low under dry friction conditions. Under 75 N, aramid/BS-4 coupled with 45 steel pins was the lowest friction coefficient, which was 0.09. In particular, the friction coefficient and wear rate of the composite-reinforced cyanate ester were the lowest, which meant that this composite may be more suitable for use under lightly loaded and reciprocating running conditions in space engineering. By comparing the surface morphologies of composites before and after the test, the wear mechanism of the composites was discussed and the lower friction coefficient and wear rate may originate from the abrasive wear effects occurring between the tribology pairs. The research results have important engineering significance for guiding the use of composites in the deployable mechanisms used in space engineering.

scholarly journals PREPARATION OF POLYMERIC COMPOSITES FROM SATURATED POLYESTERS GLASS POWDER (FLOURSCENT) AND STUDY OF ITS MECHANICAL PROPERTIES

2021 ◽  
Vol 13 (1) ◽  
pp. 131-139
Author(s):  
Esraa S. Waad Ala ◽  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Glass Powder ◽  
Unsaturated Polyester ◽  
Base Material ◽  
Polymeric Composites ◽  
Support Material ◽  
Before And After ◽  
Shock Resistance

In this study, polymeric composites were prepared from unsaturated polyester as a base material with glass powder (fluorescent) in different weight ratios (4, 6, 8, 10,and 11%) as a support material and after comparison before and after reinforcement of the prepared composites, an increase was found. In the values of mechanical properties (hardness, compressive strength), the shock resistance values decreased, but an increase in temperature leads to an increase in the values of shock resistance, as well as the values of compressive strength And it reduces the hardness value

scholarly journals Preparation of a polymeric aggregate of unsaturated polystyrene with sawdust and studying its physical and mechanical properties

2019 ◽  
Vol 10 (3) ◽  
pp. 2280-2289
Author(s):  
Ebtehag Zeki Sulyman ◽  
Hamid A. Salih ◽  
Thaer Abed Hallow
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficient ◽  
Impact Strength ◽  
Compression Strength ◽  
Acidic Solution ◽  
Unsaturated Polyester ◽  
Physical And Mechanical Properties ◽  
Polymeric Composites ◽  
Basic Substance ◽  
Before And After

In this study a type of polymeric composites from melting poly Unsaturated polyester as a basic substance with powdered sawdust was prepared, studying some of it is mechanical properties, which was included: Impact Strength (I.), Yong modulus (E), hardness (B.) and compression Strength (C.). Polymeric composites before and after reinforcing were studied by comparison between them. It was noticed increasing resistance of Yong modulus (E), Impact Strength (I.), hardness (B.) and compression Strength (C.). Also, It is studied the effect of some acids like (, H2SO4, HNO3) with concentrations (0.5 N; 1N and 1.5N) respectively. Some physical properties were studied as absorbance and poly 's diffusion coefficient before and after reinforcing. The results showed increases in values of these properties with increasing concentration of acid and time of polymer's immersion in the acidic solution.

Evaluation of Dexmedetomidine Dosing in Obese Critically Ill Patients

2021 ◽  
pp. 089719002110215
Author(s):  
Sara A. Atyia ◽  
Keaton S. Smetana ◽  
Minh C. Tong ◽  
Molly J. Thompson ◽  
Kari M. Cape ◽  
...  
Keyword(s):  
Body Weight ◽  
Critically Ill ◽  
Critically Ill Patients ◽  
Statistical Difference ◽  
Ideal Body Weight ◽  
Weight Percentage ◽  
Before And After ◽  
Light Sedation ◽  
Icu Sedation ◽  
Dose Dependent

Background: Dexmedetomidine is a highly selective α2-adrenoreceptor agonist that produces dose-dependent sedation, anxiolysis, and analgesia without respiratory depression. Due to these ideal sedative properties, there has been increased interest in utilizing dexmedetomidine as a first-line sedative for critically ill patients requiring light sedation. Objective: To evaluate the ability to achieve goal intensive care unit (ICU) sedation before and after an institutional change of dosing from actual (ABW) to adjusted (AdjBW) body weight in obese patients on dexmedetomidine. Methods: This study included patients ≥ 18 years old, admitted to a surgical or medical ICU, required dexmedetomidine for at least 8 hours as a single continuous infusion sedative, and weighed ≥ 120% of ideal body weight. Percentage of RASS measurements within goal range (−1 to +1) during the first 48 hours after initiation of dexmedetomidine as the sole sedative agent or until discontinuation dosed on ABW compared to AdjBW was evaluated. Results: 100 patients were included in the ABW cohort and 100 in the AdjBW cohort. The median dosing weight was significantly higher in the ABW group (95.9 [78.9-119.5] vs 82.2 [72.1-89.8] kg; p = 0.001). There was no statistical difference in percent of RASS measurements in goal range (61.5% vs 69.6%, p = 0.267) in patients that received dexmedetomidine dosed based on ABW versus AdjBW. Conclusion: Dosing dexmedetomidine using AdjBW in obese critically ill patients for ongoing ICU sedation resulted in no statistical difference in the percent of RASS measurements within goal when compared to ABW dosing. Further studies are warranted.

scholarly journals Synthesis, Characterization and Testing of Antimicrobial Activity of Composites of Unsaturated Polyester Resins with Wood Flour and Silver Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1122
Author(s):  
Przemysław Pączkowski ◽  
Andrzej Puszka ◽  
Malgorzata Miazga-Karska ◽  
Grażyna Ginalska ◽  
Barbara Gawdzik
Keyword(s):  
Silver Nanoparticles ◽  
Staphylococcus Epidermidis ◽  
Polyester Resin ◽  
Wood Flour ◽  
Unsaturated Polyester ◽  
Thermomechanical Properties ◽  
Resin Composites ◽  
Polyester Resins ◽  
Before And After

This paper presents the properties of the wood-resin composites. For improving their antibacterial character, silver nanoparticles were incorporated into their structures. The properties of the obtained materials were analyzed in vitro for their anti-biofilm potency in contact with aerobic Gram-positive Staphylococcus aureus and Staphylococcus epidermidis; and aerobic Gram-negative Escherichia coli and Pseudomonas aeruginosa. These pathogens are responsible for various infections, including those associated with healthcare. The effect of silver nanoparticles incorporation on mechanical and thermomechanical properties as well as gloss were investigated for the samples of composites before and after accelerating aging tests. The results show that bacteria can colonize in various wrinkles and cracks on the composites with wood flour but also the surface of the cross-linked unsaturated polyester resin. The addition of nanosilver causes the death of bacteria. It also positively influences mechanical and thermomechanical properties as well as gloss of the resin.

scholarly journals The effect of the surface modification of carbon nanotubes on their dispersion in the epoxy matrix

2011 ◽  
Vol 13 (2) ◽  
pp. 62-69 ◽  
Author(s):  
Maria Wladyka-Przybylak ◽  
Dorota Wesolek ◽  
Weronika Gieparda ◽  
Anna Boczkowska ◽  
Ewelina Ciecierska
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Mechanical Mixing ◽  
Weight Percentage ◽  
Homogeneous Dispersion ◽  
Multi Walled Carbon Nanotubes ◽  
Mixing Method ◽  
Walled Carbon Nanotubes

The effect of the surface modification of carbon nanotubes on their dispersion in the epoxy matrix Functionalization of multi-walled carbon nanotubes (MWCNTs) has an effect on the dispersion of MWCNT in the epoxy matrix. Samples based on two kinds of epoxy resin and different weight percentage of MWCNTs (functionalized and non-functionalized) were prepared. Epoxy/carbon nanotubes composites were prepared by different mixing methods (ultrasounds and a combination of ultrasounds and mechanical mixing). CNTs modified with different functional groups were investigated. Surfactants were used to lower the surface tension of the liquid, which enabled easier spreading and reducing the interfacial tension. Solvents were also used to reduce the liquid viscosity. Some of them facilitate homogeneous dispersion of nanotubes in the resin. The properties of epoxy/nanotubes composites strongly depend on a uniform distribution of carbon nanotubes in the epoxy matrix. The type of epoxy resin, solvent, surfactant and mixing method for homogeneous dispersion of CNTs in the epoxy matrix was evaluated. The effect of CNTs functionalization type on their dispersion in the epoxy resins was evaluated on the basis of viscosity and microstructure studies.

Study on Effect of Spheroidization on Hazardous Classification of ADN

2021 ◽  
Vol 881 ◽  
pp. 71-76
Author(s):  
Jian Yang ◽  
Hong Bin Li ◽  
Song Tao Ren ◽  
Peng Gang Jin ◽  
Zan Gao
Keyword(s):  
Temperature Stability ◽  
Impact Sensitivity ◽  
Classification Method ◽  
Ammonium Dinitramide ◽  
Classification Procedure ◽  
Research Results ◽  
Before And After ◽  
Hazard Classification ◽  
Friction Sensitivity

In order to determine the influence of spheroidization process of Ammonium dinitramide’s hazard grade, the hazardous division of Ammonium dinitramide before and after spheroidization is studied by using hazard classification procedure for combustible and explosive substances and articles standard (WJ20405) and hazard classification method and criterion for combusitible and explosive substances and articles standard (WJ20404). The research results show that spheroidization process can significantly improve the temperature stability of Ammonium dinitramide and significantly reduce friction sensitivity and impact sensitivity of Ammonium dinitramide. So spheroidization process can reduce the hazardous of Ammonium dinitramide and improve the safe character of Ammonium dinitramide.

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