Studies on structural, optical and mechanical properties of MWCNTs and ZnO nanoparticles doped PVA nanocomposites

AbstractThis paper presents a novel class of multiwalled carbon nanotubes (MWCNTs) and zinc oxide (ZnO) doped polyvinyl alcohol (PVA) nanocomposites prepared using coagulation and solvent casting method. The dopant, ZnO nanoparticles, was prepared using precipitation method, and another dopant, MWCNTs, was treated with H

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Structures, Optical and Mechanical Properties of PLA/ZnO SiO2 Al2O3 Composite Elaborated by a Solvent Casting Method

Proceedings ◽

10.3390/proceedings2019026018 ◽

2019 ◽

Vol 26 (1) ◽

pp. 18

Author(s):

Bouamer ◽

Benrekaa ◽

Younes

Keyword(s):

Mechanical Properties ◽

Polylactic Acid ◽

Solvent Casting ◽

Casting Method ◽

Al2o3 Composite ◽

Optical And Mechanical Properties

In this study, granulated polylactic acid and ZnO, SiO2 and Al2O3 powders were mixed to form PLA/ZnO and PLA/ZnO SiO2 Al2O3 composites with different concentrations using a solvent casting method. [...]

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Simultaneous Improvement of the Electric Conductive and Mechanical Properties of Nanostructured Aluminum Alloy

10.21203/rs.3.rs-1087558/v1 ◽

2021 ◽

Author(s):

Emerson Prazeres ◽

Cristian Loayza ◽

Vinicius Reis ◽

Victor Melo ◽

José Quaresma ◽

...

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Electrical Conductivity ◽

Hydrogen Peroxide ◽

Stainless Steel ◽

Metal Matrix ◽

Aluminum Matrix ◽

Ultimate Tensile Stress ◽

Casting Method ◽

Multiwalled Carbon

Abstract Aluminum nanocomposites demonstrate improvements in the mechanical properties, as well as in thermal and electric conductivity. The incorporation of multiwalled carbon nanotubes (MWCNT) in the aluminum matrix, using conventional melting methods, is a long-standing issue. In this paper, Aluminum nanocomposites were fabricated via conventional casting method, using a nanostructured stainless-steel (SS) powder. Carbon nanotubes were treatment treated with hydrogen peroxide, allowed which led to an attachment with to the metal matrix particles. In this sense, The the SS powder, added as an element alloy, refinement refined the grains, and the MWCNT providedled the electric conductive to a better performance. Given this, the best alloy analyzed presented an approximate 10% increase in all of its characterized properties, that is,therefore presenting a microhardness of 48 HV, a Ultimate Tensile Stress of 183 Mpa, and and an electrical conductivity of 67% of IACS..

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Dispersion and alignment quantification of carbon nanotubes in a polyvinyl alcohol matrix

Journal of Composite Materials ◽

10.1177/0021998317731151 ◽

2017 ◽

Vol 52 (12) ◽

pp. 1617-1626 ◽

Cited By ~ 11

Author(s):

Cesar A Isaza M ◽

JM Herrera Ramírez ◽

JE Ledezma Sillas ◽

JM Meza

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Polyvinyl Alcohol ◽

Multiwalled Carbon Nanotubes ◽

Polymer Matrix Composites ◽

Separation Distance ◽

Nanoindentation Test ◽

Matrix Composites ◽

Multiwalled Carbon ◽

Transmission Electron Microscopy Analysis

In recent years, due to their high specific mechanical properties, polymer matrix composites have been widely used. In particular, carbon nanotubes have been used as reinforcement because of their exceptional properties. In this work, the degree of dispersion and alignment of multiwalled carbon nanotubes into polyvinyl alcohol was quantified, which is a key information to optimize the mechanical properties of composites. For the dispersion of the multiwalled carbon nanotubes into the solution, a magnetic stirring and ultrasonic agitation were used. Finally, the mixture was dried to obtain a multiwalled carbon nanotubes reinforced polymer. The composites were mechanically stretched to obtain sheets with multiwalled carbon nanotubes aligned in the stretching direction. The layers obtained were prepared for transmission electron microscopy analysis. A dispersion quantification method based on the statistical distribution of horizontal and vertical separation distance between carbon nanotubes was used; a lognormal distribution was obtained. The angle of carbon nanotubes with respect to the stretching direction was used to quantify the alignment degree of carbon nanotubes. The bulk mechanical properties of the composites were measured by nanoindentation test; tensile test allowed to measure the mechanical properties of the composites in both the stretching and perpendicular directions to the stretching direction. Multiwalled carbon nanotubes showed a good dispersion and alignment degree and this, in conjunction with stretching, produced a high increase of both the stiffness and strength in the stretching direction, which allowed an increment of the mechanical properties measured by nanoindentation test; the best properties of the composites were reached with 0.5 wt% of MWCNTs.

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Improved Thermal and Fire Retardant Behavior of Polyvinyl Alcohol Matrix Using Nanocomposites

International Journal of Nanoscience ◽

10.1142/s0219581x18500254 ◽

2019 ◽

Vol 18 (05) ◽

pp. 1850025 ◽

Cited By ~ 1

Author(s):

K. Jeyasubramanian ◽

E. Muthusankar ◽

G. S. Hikku ◽

N. Selvakumar

Keyword(s):

Thermal Stability ◽

Polyvinyl Alcohol ◽

Copper Chloride ◽

Fire Retardant ◽

Zinc Borate ◽

Precipitation Method ◽

Solvent Casting ◽

Casting Method ◽

Limiting Oxygen Index ◽

Degradation Temperature

This report discusses in detail about the Fire retardant (FR) characteristics of polyvinyl alcohol (PVA) matrix fabricated by impregnating zinc borate nanoparticles (ZB Nps) as FR with trace amounts of copper chloride/aluminum chloride by solvent casting method. ZB Nps prepared by co-precipitation method are characterized using XRD, FTIR, SEM, TEM, etc. XRD pattern revealed the crystal geometry of ZB Nps and SEM and TEM micrographs depict a rod-like structure with 300–400[Formula: see text]nm size. Appropriate amount of ZB Nps and transition metal salts are mixed with PVA in aqueous medium and thin film samples are obtained by solvent casting method. The vibrational spectra, thermal stability and flammability of the polymeric composites are characterized using FTIR, TG/DTA and Flammability tester, respectively. FTIR spectra confirm the existence of ZB Nps in the prepared polymer composites. TG/DTA studies revealed higher degradation temperature and thermal stability of polymer composite over pure PVA. The limiting oxygen index (LOI) test presented a convincing account about the improved FR nature of obtained polymer nano composite with a significant LOI of 56% compared to virgin polymer which have LOI of 19.6%.

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