The Preparation, Morphology and Electrical Properties of Polystyrene/Graphene Nanocomposite Foams Using Supercritical Carbon Dioxide

2013 ◽  
Vol 771 ◽  
pp. 51-54
Author(s):  
Ying Hu Li ◽  
Li Kuo Zhou ◽  
Chao Qun Li
Keyword(s):  
Carbon Dioxide ◽  
Electrical Properties ◽  
Supercritical Carbon Dioxide ◽  
Functional Materials ◽  
Nanocomposite Foams ◽  
Chemically Reduced Graphene Oxide ◽  
Graphene Nanocomposite ◽  
Higher Temperature ◽  
Foaming Temperature ◽  
Supercritical Carbon

In this work, polystyrene/ graphene nanocomposite foams were prepared using supercritical carbon dioxide. Chemically reduced graphene oxide were incorporated into PS using latex mixing. Subsequently, the nanocomposites were foamed with supercritical CO2, the foaming temperature is varied. The morphology and electrical properties of the foamed samples were discussed. It is suggested that foaming temperature has significant influence on the morphology of foams. For those samples foamed at higher temperature, foams have thin cell wall and low density even when the content of graphene is relatively high, while they possess good electrical conductivity, may be used as light weight functional materials.

Controlled foaming of polycarbonate/polymethyl methacrylate thin film with supercritical carbon dioxide

2016 ◽  
Vol 30 (12) ◽  
pp. 1713-1727 ◽  
Author(s):  
Yuanxiang Luo ◽  
Yajun Ding ◽  
Changchun Wang ◽  
Linghua Tan ◽  
Sanjiu Ying
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymethyl Methacrylate ◽  
Saturation Pressure ◽  
Saturation Temperature ◽  
Mean Diameter ◽  
The Mean ◽  
Foaming Temperature ◽  
Supercritical Carbon ◽  
Foaming Time

The polycarbonate (PC)/polymethyl methacrylate (PMMA) (10/90) blends with microcellular foams were prepared by the two-step process using supercritical carbon dioxide as physical foaming agent. The effects of saturation temperature, saturation pressure, foaming temperature, and foaming time on the cell morphology structure were investigated by scanning electron microscopy. The results indicated that the mean diameter of cells in foamed PC/PMMA films decreased with the increment of saturation temperature and saturation pressure but increased with the increment of the foaming time. Moreover, the mean diameter of cells decreased first, but then increased with the increment of the foaming temperature. The cell density ( Nc) increased with the increment of saturation temperature and saturation pressure but decreased with the increment of the foaming time. However, the Nc increased first but then decreased with the increment of the foaming temperature.

IMPROVEMENT ON CHARACTERISTICS OF FERROELECTRIC THIN FILMS USING SUPERCRITICAL CARBON DIOXIDE FLUID TREATMENT

2012 ◽  
Vol 06 ◽  
pp. 104-108
Author(s):  
CHIEN-MIN CHENG ◽  
MING-CHANG KUAN ◽  
KAI-HUNAG CHEN ◽  
JEN-HWAN TSAI
Keyword(s):  
Thin Films ◽  
Carbon Dioxide ◽  
Electrical Properties ◽  
Low Temperature ◽  
Supercritical Carbon Dioxide ◽  
Oxygen Vacancy ◽  
Current Density ◽  
Pure Water ◽  
Ferroelectric Thin Films ◽  
Supercritical Carbon

Electrical and physical properties of as-deposited Bi 3.9 La 0.1 Ti 2.9 V 0.1 O 12 (BLTV) ferroelectric thin films on SiO 2/ Si (100) substrates were improved by low temperature supercritical carbon dioxide fluid (SCF) process treatment. The as-deposited BLTV ferroelectric thin films were treated by SCF process which mixed with propyl alcohol and pure water. The memory windows increased in C-V curves, and the oxygen vacancy and defect in leakage current density curves were obtained after SCF process treatment. Finally, the improvement properties of as-deposited BLTV thin films after SCF process treatment were investigated by XPS, C-V, and J-E measurement. The mechanism concerning the dependence of electrical properties of the ferroelectric thin films on the SCF process was investigated and discussed.

Foaming of CNTs/PMMA Nanocomposite with Supercritical Carbon Dioxide

2012 ◽  
Vol 508 ◽  
pp. 61-64 ◽  
Author(s):  
Yuan Lu Xiong ◽  
Qiang Shen ◽  
Huan Yuan ◽  
Fei Chen ◽  
Guo Qiang Luo
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Cell Density ◽  
Cell Structure ◽  
Cell Distribution ◽  
Emi Shielding ◽  
Blowing Agent ◽  
Foaming Process ◽  
Nanocomposite Foams ◽  
Supercritical Carbon

The CNTs/PMMA Nanocomposite Foams Are a Kind of Novel Multifunctional Foams which Have a Potential Application for Lightweight Conductive and EMI Shielding Materials. In this Work, the CNTs/PMMA Nanocomposite Foams with Different CNTs Contents from 1wt.% to 10wt.% Were Prepared at a Temperature Range of 50-140 °C with Supercritical Carbon Dioxide as Blowing Agent. The Results Suggest that the Fully Heterogeneous Nucleation Is Achieved due to the Contribution of Well-Dispersed CNTs in PMMA. The CNTs/PMMA Nanocomposite Foams Exhibit a Uniform Cell Distribution, and the Cell Density Is Two Orders of Magnitude Higher than that of PMMA Foams. The Cell Size and Cell Density of CNTs/PMMA Nanocomposite Foams Could Be Controlled by Adjusting the Foaming Process and CNTs Contents. It Is Also Suggested that the Foaming Process Plays an Important Role on the Cell Structure Rather than that of CNTs Content when it Is Higher than 1wt.%.

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