Polymorphism of electrospun polyvinylidene difluoride/carbon nanotube (CNT) nanocomposites: Synergistic effects of CNT surface chemistry, extensional force and supercritical carbon dioxide treatment

Polymer ◽  
2012 ◽  
Vol 53 (22) ◽  
pp. 5097-5102 ◽  
Author(s):  
Wu Aik Yee ◽  
Junhua Kong ◽  
Chao Zhang ◽  
Tianxi Liu ◽  
Masaya Kotaki ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotube ◽  
Supercritical Carbon Dioxide ◽  
Surface Chemistry ◽  
Synergistic Effects ◽  
Polyvinylidene Difluoride ◽  
Supercritical Carbon

scholarly journals Controlling Foam Morphology of Poly(methyl methacrylate) via Surface Chemistry and Concentration of Silica Nanoparticles and Supercritical Carbon Dioxide Process Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Deniz Rende ◽  
Linda S. Schadler ◽  
Rahmi Ozisik
Keyword(s):  
Carbon Dioxide ◽  
Surface Modification ◽  
Supercritical Carbon Dioxide ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Process Parameters ◽  
Process Conditions ◽  
Average Cell ◽  
Foam Morphology ◽  
Supercritical Carbon

Polymer nanocomposite foams have received considerable attention because of their potential use in advanced applications such as bone scaffolds, food packaging, and transportation materials due to their low density and enhanced mechanical, thermal, and electrical properties compared to traditional polymer foams. In this study, silica nanofillers were used as nucleating agents and supercritical carbon dioxide as the foaming agent. The use of nanofillers provides an interface upon which CO2nucleates and leads to remarkably low average cell sizes while improving cell density (number of cells per unit volume). In this study, the effect of concentration, the extent of surface modification of silica nanofillers with CO2-philic chemical groups, and supercritical carbon dioxide process conditions on the foam morphology of poly(methyl methacrylate), PMMA, were systematically investigated to shed light on the relative importance of material and process parameters. The silica nanoparticles were chemically modified with tridecafluoro-1,1,2,2-tetrahydrooctyl triethoxysilane leading to three different surface chemistries. The silica concentration was varied from 0.85 to 3.2% (by weight). The supercritical CO2foaming was performed at four different temperatures (40, 65, 75, and 85°C) and between 8.97 and 17.93 MPa. By altering the surface chemistry of the silica nanofiller and manipulating the process conditions, the average cell diameter was decreased from9.62±5.22to1.06±0.32 μm, whereas, the cell density was increased from7.5±0.5×108to4.8±0.3×1011cells/cm3. Our findings indicate that surface modification of silica nanoparticles with CO2-philic surfactants has the strongest effect on foam morphology.

Benign reduction of carbon nanotube agglomerates using a supercritical carbon dioxide process

2014 ◽  
Vol 117 (3) ◽  
pp. 1003-1017 ◽  
Author(s):  
John P. Quigley ◽  
Kevin Herrington ◽  
Michael Bortner ◽  
Donald G. Baird
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotube ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon

Activation of Carbon Nanotube Emitters by Using Supercritical Carbon Dioxide Fluids with Propyl Alcohol

2006 ◽  
Vol 9 (4) ◽  
pp. G124 ◽  
Author(s):  
Po-Tsun Liu ◽  
C. T. Tsai ◽  
T. C. Chang ◽  
K. T. Kin ◽  
P. L. Chang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotube ◽  
Supercritical Carbon Dioxide ◽  
Propyl Alcohol ◽  
Supercritical Carbon

Gradient foaming of polycarbonate/carbon nanotube based nanocomposites with supercritical carbon dioxide and their EMI shielding performances

Polymer ◽  
2015 ◽  
Vol 59 ◽  
pp. 117-123 ◽  
Author(s):  
Laure Monnereau ◽  
Laetitia Urbanczyk ◽  
Jean-Michel Thomassin ◽  
Thomas Pardoen ◽  
Christian Bailly ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotube ◽  
Supercritical Carbon Dioxide ◽  
Emi Shielding ◽  
Supercritical Carbon
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