The plasticizer-assisted formation of a percolating multiwalled carbon nanotube network in biodegradable poly(L-lactide)

2011 ◽  
Vol 123 (3) ◽  
pp. 1843-1847 ◽  
Author(s):  
Shufen Zou ◽  
Bing Na ◽  
Ruihua Lv ◽  
Huayan Pan
Keyword(s):  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Network ◽  
Biodegradable Poly

Double-segregated multiwalled carbon nanotube/silicone composites with large electrical to thermal conductivity ratios via in-situ silicone emulsion polymerization

2020 ◽  
Vol 54 (23) ◽  
pp. 3447-3456
Author(s):  
Dongouk Kim ◽  
Sang-Eui Lee ◽  
Yoonchul Sohn
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Multiwalled Carbon Nanotube ◽  
Layer By Layer ◽  
Multiwalled Carbon ◽  
Water Solvent ◽  
Carbon Nanotube Network ◽  
Silicone Emulsion

Polymer composites with a high electrical conductivity ( σ) to thermal conductivity ( k) ratio have been intensively investigated in recent years. While highly conductive materials, such as metallic fillers or conducting polymers, were used to enhance σ, microstructural engineering was used to decrease k by forming porous structures, such as aerogels or 3D networks. These structures, however, were mechanically vulnerable and could only have limited applications. In this study, multiwalled carbon nanotube /silicone composites with a high σ/k ratio were developed by forming a double-segregated multiwalled carbon nanotube network in the porous body of the composites. The unique microstructure of the composites was created by a novel fabrication process: layer-by-layer deposition with in-situ polymerization of silicone emulsion particles dispersed in a water solvent. This novel process yielded very thick films, >200 µm, with high σ/k values, ∼2 × 104 (S/m)/(W/m·K). These high σ/k composites can be used for various applications, such as resistive heating elements, thermoelectric materials, and wearable thermotherapy.

scholarly journals Biodegradable Poly(Lactic Acid)/Multiwalled Carbon Nanotube Nanocomposite Fabrication Using Casting And Hot Press Techniques

2015 ◽  
Vol 60 (2) ◽  
pp. 1557-1559 ◽  
Author(s):  
S.G. Park ◽  
A. Abdal-Hay ◽  
J.K. Lim
Keyword(s):  
Lactic Acid ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Poly Lactic Acid ◽  
Hot Press ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Biodegradable Poly ◽  
Composite Samples

Abstract Biodegradable advanced polymer composites have recently received a large amount of attention. The present study aimed to design poly(lactic acid) multiwalled carbon nanotube nanocomposites (PLA/MWCNTs) using a simple fabrication technique. A PLA sheet was first dissolved in dichloromethane, and MWCNTs were subsequently added at various concentrations (0.5, 1.5 and 5%) while applying shear strain stirring to achieve dispersion of carbon nanotubes (CNTs). These solutions were then molded and a hot press was used to generate sheets free of voids with entrapped solvent. The prepared samples were characterized using field emission scanning electron microscopy (FE-SEM), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). Our data showed composite samples free of defects and voids, indicating that the hot press is capable of generating sufficiently compact polymer matrices. Additionally, TGA and FTIR showed significant bonding interactions between the PLA matrix and the nano-fillers. Collectively, our results suggest that incorporation of CNTs as nano-fillers into biodegradable polymers may have multiple applications in many different sectors.

Multiwalled Carbon Nanotube Network-Based Sensorsand Electronic Devices

2015 ◽  
pp. 225-242 ◽  
Author(s):  
Wolfgang R. Fahrner ◽  
Giovanni Landi ◽  
Raffaele Di Giacomo ◽  
Heinz C. Neitzert
Keyword(s):  
Carbon Nanotube ◽  
Electronic Devices ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Network
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