Modeling the Influence of Structure Morphology on the Physical and Mechanical Properties of Nanocomposites Based on a Polymer Matrix and Graphene Oxide

2020 ◽  
Vol 55 (3) ◽  
pp. 316-323
Author(s):  
V. P. Matveenko ◽  
M. A. Tashkinov
2020 ◽  
Vol 869 ◽  
pp. 488-493
Author(s):  
Aues A. Beev ◽  
Svetlana Yu. Khashirova ◽  
Azamat L. Slonov ◽  
Ismel V. Musov ◽  
Azamat Zhansitov ◽  
...  

The article presents the results of sizing of discrete carbon fibers with various substances and their effect on the properties of polyetherimide composites. As sizing agents, 1,3-diaminobenzene, 4,4'-dihydroxy-2,2-diphenylpropane, polyetherimide and oligoetherether sulfone were used. The study of physical and mechanical properties showed that all the substances used increase the properties of the carbon-filled composite based on polyetherimide. The highest mechanical properties are demonstrated by a composite containing carbon fibers treated with 1,3-diaminobenzene, which indicates improved compatibility of the filler and the polymer matrix and enhanced intermolecular interactions.


2019 ◽  
Vol 184 ◽  
pp. 107836 ◽  
Author(s):  
O. Velazquez-Meraz ◽  
J.E. Ledezma-Sillas ◽  
C. Carreño-Gallardo ◽  
W. Yang ◽  
N.M. Chaudhari ◽  
...  

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1773 ◽  
Author(s):  
Mayra Eliana Valencia Zapata ◽  
Lina Marcela Ruiz Rojas ◽  
José Herminsul Mina Hernández ◽  
Johannes Delgado-Ospina ◽  
Carlos David Grande Tovar

Bacterial infections are a common complication after total joint replacements (TJRs), the treatment of which is usually based on the application of antibiotic-loaded cements; however, owing to the increase in antibiotic-resistant microorganisms, the possibility of studying new antibacterial agents in acrylic bone cements (ABCs) is open. In this study, the antibacterial effect of formulations of ABCs loaded with graphene oxide (GO) between 0 and 0.5 wt.% was evaluated against Gram-positive bacteria: Bacillus cereus and Staphylococcus aureus, and Gram-negative ones: Salmonella enterica and Escherichia coli. It was found that the effect of GO was dependent on the concentration and type of bacteria: GO loadings ≥0.2 wt.% presented total inhibition of Gram-negative bacteria, while GO loadings ≥0.3 wt.% was necessary to achieve the same effect with Gram-positives bacteria. Additionally, the evaluation of some physical and mechanical properties showed that the presence of GO in cement formulations increased wettability by 17%, reduced maximum temperature during polymerization by 19%, increased setting time by 40%, and increased compressive and flexural mechanical properties by up to 17%, all of which are desirable behaviors in ABCs. The formulation of ABC loading with 0.3 wt.% GO showed great potential for use as a bone cement with antibacterial properties.


1986 ◽  
Vol 24 (7) ◽  
pp. 1401-1439 ◽  
Author(s):  
C. P. Christenson ◽  
M. A. Harthcock ◽  
M. D. Meadows ◽  
H. L. Spell ◽  
W. L. Howard ◽  
...  

2020 ◽  
Vol 9 (1) ◽  
pp. 115-135 ◽  
Author(s):  
Mingrui Du ◽  
Hongwen Jing ◽  
Yuan Gao ◽  
Haijian Su ◽  
Hongyuan Fang

AbstractCarbon nanomaterials, predominantly carbon nanofibers, carbon nanotubes, graphene, graphene nanoplates, graphene oxide and reduced graphene oxide, possess superior chemical, physical and mechanical properties. They have been successfully introduced into ordinary Portland cement to give enhancements in terms of mechanical properties, durability and electrical/thermal conductivity, and to modify the functional properties, converting conventional cement-based materials into stronger, smarter and more durable composites. This paper provides a comprehensive review of the properties of carbon nanomaterials, current developments and novel techniques in carbon nanomaterials enhanced cement-based composites (CN-CBCs). Further study of the applications of CN-CBCs at industrial scale is also discussed.


2021 ◽  
Vol 10 (2) ◽  
pp. 1-9
Author(s):  
René García-Contreras ◽  
◽  
Héctor Guzmán-Juárez ◽  
Daniel López-Ramos ◽  
Carlos Alvarez-Gayosso ◽  
...  

Objective: To determine the cytotoxicity and effects of graphene oxide (GO) on cellular proliferation of gingival-fibroblasts, pulpdental cells and human osteoblasts in culture, and to determine the physical, mechanical and biological properties of poly (methyl methacrylate) (PMMA) enriched with GO. Material and Methods: T he G O w as c haracterized with SEM. Cytotoxicity and cell proliferation were determined by the MTT bioassay. The physical-mechanical tests (flexural strength and elastic modulus) were carried out with a universal testing machine. Sorption and solubility were determined by weighing before and after drying and immersion in water. Porosity was evaluated by visual inspection. Data were analyzed with Student's t-test and Tukey's post-hoc ANOVA. Results: The GO has a heterogeneous morphology and a particle size of 66.67±64.76 μm. GO has a slight to no-cytotoxicity (>50-75% viability) at 1-30 days, and at 24 hours incubation of PMMA with GO significantly stimulates osteoblasts (45±8%, p<0.01). The physical and mechanical properties of PMMA with GO increase considerably without altering sorption, solubility and porosity. Conclusion: GO alone or with PMMA has an acceptable biocompatibility, could contribute to cell proliferation, cell regeneration and improve the physical-mechanical properties of PMMA.


Author(s):  
Himanshu Gupta ◽  
Kamal Kanaujiya ◽  
Syed Mazher Abbas Rizvi

To determine the possibility of using sugar- cane bagasse (SCB)and ground nut shell particulate(GNSP) waste as reinforcing ?ller in the thermo plastic polymer matrix, SCB&GNSP-reinforced polypropylene (PP) composites were prepared. The PP and SCB and GNSP composites were prepared by the extrusion of PP and GNSP with 5, 10, 15, and 20 wt % of SCB and GNSP with 3,6,9 and 12% filler in a co rotating twin screw extruder.. The extruded strands were cut into pellets and injection molded to make test specimens. These specimens were tested for physical and mechanical properties such as tensile, flexural, Izod impact strength shore D hardness and water absorption. It was found that the Tensile strength increased from 29.06 to 31.38 MPa, Flexural strength increased from 28.62 to 43.56 MPa, Izod impact strength decreased from 35.11 to 30.93 J/m, and Shore D Hardness increased from 64.88 to 77.89, with increase in filler loading from 5 to 20% in the PP matrix. The decrease in Izod Impact strength and elongation with addition of SCB & GNSP filler to PP matrix follows the general trend of filler effects on polymer matrix. However, the main purpose of this work was to study the effect of SCB & GNSP waste on the mechanical properties of the PP Composites. The SCB and GNSP waste can be used as filler in the PP composites, which will reduce cost and give environmental benefits.


2018 ◽  
Vol 1120 ◽  
pp. 012052
Author(s):  
S Gea ◽  
D A Barus ◽  
Y S Sibarani ◽  
N Panindia ◽  
J N Sari ◽  
...  

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 18060-18067 ◽  
Author(s):  
Guo-Xiang Zhou ◽  
Jing Zhong ◽  
Heng Zhang ◽  
Xinhua Hu ◽  
Jianlin Wu ◽  
...  

Graphene oxide (GO) is increasingly used in various applications, and the implications of this nano-sized material entering the natural environment are of great interest.


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