PVA/MWNTs Composite Nanofibers Prepared by Electrospun

2010 ◽  
Vol 44-47 ◽  
pp. 2377-2380
Author(s):  
Hui Qin Zhang ◽  
Ai Mei Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Fourier Transform ◽  
Composite Nanofibers ◽  
Multiwall Carbon Nanotubes ◽  
High Energy ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Multiwall Carbon

The Polyvinyl alcohol (PVA)/ multiwall carbon nanotubes (MWNT) nanofibers were prepared by electrospun assisted by high-energy sonication. The morphological structures and characterized of the nanofibers were observed via scanning electronic microscopy (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR). Electrical properties and mechanical properties of the film have been tested. The results indicate that the introduction of ATO nanoparticles into the polymer matrix has a significant effect on the thermal stability properties of PVA and a strong interaction between PVA and MWNTs.

Effects of multiwall carbon nanotubes on dielectric and mechanical properties of CaCu3Ti4O12 composite

2020 ◽  
Vol 46 (12) ◽  
pp. 20313-20319
Author(s):  
Mohsen Ahmadipour ◽  
Mohammad Arjmand ◽  
Anh Thi Le ◽  
Sin Ling Chiam ◽  
Zainal Arifin Ahmad ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Dielectric And Mechanical Properties ◽  
Multiwall Carbon

scholarly journals Effects of Adding Multiwall Carbon Nanotubes on Performance of Polyvinyl Acetate and Urea-Formaldehyde Adhesives in Tropical Timber Species

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Róger Moya ◽  
Ana Rodríguez-Zúñiga ◽  
José Vega-Baudrit
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Polyvinyl Acetate ◽  
Urea Formaldehyde ◽  
Multiwall Carbon Nanotubes ◽  
Hydroxyl Groups ◽  
Timber Species ◽  
Tropical Timber ◽  
Tropical Woods ◽  
Multiwall Carbon

Multiwall carbon nanotubes (MWCNTs) functionalized with hydroxyl groups (MWCNTs-OH) have been incorporated into polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives utilized in tropical wood gluing. The Raman spectroscopy, the atomic force microscopy (AFM), and transmission electron microscopy (TEM) were used to describe the MWCNTs-OH. The adhesives were evaluated in three concentrations of MWCNTs-OH: 0% (control), 0.05%, and 0.1%. The evaluation included color, the distribution of MWCNTs-OH by TEM and AFM, thermal stability and viscosity of the adhesives, and shear strength (SS) of the glue line for nine tropical woods. AFM and TEM confirmed interaction of MWCNTs-OH with adhesives. The viscosity of the PVAc adhesive increases with added MWCNTs-OH. The incorporation of MWCNTs-OH in PVAc and UF resin produces wood adhesives with less brightness, less yellowness, and increased redness. The nanotubes in the adhesive improved the thermal stability of the composites and increased the entropy factor and energy of activation in the kinetic decomposition of the resin. In relation to SS, MWCNTs-OH in any of the two concentrations had no significant effect on SS in dry condition in half of the species studied glued with PVAc adhesive, whereas, for UF-adhesive, the SS and percentage of wood failure improved in most of the 9 species studied.

Effect of Chemical Oxidation Routes on the Properties of Chitosan- MWCNT Nanocomposites

2019 ◽  
Vol 15 (6) ◽  
pp. 618-625 ◽  
Author(s):  
Alejandro Gomez Sánchez ◽  
Evgen Prokhorov ◽  
Gabriel Luna-Barcenas ◽  
Yuriy Kovalenko ◽  
Eric M. Rivera-Muñoz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Interfacial Layer ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Oxidation ◽  
Surface Groups ◽  
Mechanical Measurements ◽  
Carboxylic Groups ◽  
Functionalized Mwcnts ◽  
Multiwall Carbon

Background: Chitosan-multiwall carbon nanotubes (CS-MWCNTs) nanocomposites are an attractive material due to their biocompatibility and possibility to produce nanocomposites with high conductivities and high mechanical properties. Both electrical and mechanical properties depend upon the method of MWCNT chemical oxidation; this oxidation affects the interaction of CS side groups with MWCNT’s surface groups. However, in the literature, there are no reports on how different methods of MWCNT oxidation will affect the electrical and mechanical properties of related nanocomposites. Objective: The objective of this work is to probe CS-MWCNT nanocomposite’s electrical and mechanical properties by taking advantage of the presence of interfacial layer and its dependence on the methods of MWCNTs chemical oxidation routes. Methods: Nanocomposites are prepared with non-functionalized MWCNT and functionalized MWCNTs obtained by chemical oxidation treatments in HNO3 in H2SO4/NHO3 mixtures and commercially carboxyl-terminated MWCNTs, respectively. Properties of MWCNTs and nanocomposites were evaluated using SEM, FTIR, Raman, TGA, XRD, impedance and mechanical measurements. Results: It was shown that different chemical oxidation routes produce MWCNTs with a different number of carboxylic groups and defects which influence the interaction between MWCNTs with CS matrix and thickness of the interfacial layer between MWCNTs and CS matrix. Additionally, it was shown that the formation of the interfacial layer dominates on the dispersion of MWCNTs and affects on the electrical and mechanical percolation effects. Conclusion: It was shown that contrary to many studies previously reported, good dispersion of MWCNT does not guarantee obtained nanocomposites with the best electrical and mechanical properties.

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