In Situ Natural Abundance 17O and 25Mg NMR Investigation of Aqueous Mg(OH)2 Dissolution in the Presence of Supercritical CO2

2016 ◽  
Vol 50 (22) ◽  
pp. 12373-12384 ◽  
Author(s):  
Mary Y. Hu ◽  
Xuchu Deng ◽  
K. Sahan Thanthiriwatte ◽  
Virgil E. Jackson ◽  
Chuan Wan ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Natural Abundance

scholarly journals High Performance Attapulgite/Polypyrrole Nanocomposite Reinforced Polystyrene (PS) Foam Based on Supercritical CO2 Foaming

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 985 ◽  
Author(s):  
Yidong Liu ◽  
Lingfeng Jian ◽  
Tianhua Xiao ◽  
Rongtao Liu ◽  
Shun Yi ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
High Performance ◽  
In Situ Polymerization ◽  
Compression Modulus ◽  
Blowing Agents ◽  
Foaming Process ◽  
Potential Applications ◽  
Polymerization Method ◽  
Low Solubility

CO2 has been regarded as one of the most promising blowing agents for polystyrene (PS) foam due to its non-flammability, low price, nontoxicity, and eco-friendliness. However, the low solubility and fast diffusivity of CO2 in PS hinder its potential applications. In this study, an attapulgite (ATP)/polypyrrole (PPy) nanocomposite was developed using the in situ polymerization method to generate the hierarchical cell texture for the PS foam based on the supercritical CO2 foaming. The results demonstrated that the nanocomposite could act as an efficient CO2 capturer enabling the random release of it during the foaming process. In contrast to the pure PS foam, the ATP/PPy nanocomposite reinforced PS foam is endowed with high cell density (up to 1.9 × 106) and similar thermal conductivity as the neat PS foam, as well as high compression modulus. Therefore, the in situ polymerized ATP/PPy nanocomposite makes supercritical CO2 foaming desired candidate to replace the widely used fluorocarbons and chlorofluorocarbons as PS blowing agents.

Dispersion Polymerization of Methyl Methacrylate in Supercritical CO2: A Preliminary Evaluation of In Situ Incorporation of Copaiba Oil

2020 ◽  
Vol 59 (20) ◽  
pp. 9398-9407
Author(s):  
T. M. M. Santos ◽  
B. B. Chaves ◽  
J. S. Cerqueira ◽  
M. M. Canario ◽  
D. Bresolin ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Supercritical Co2 ◽  
Dispersion Polymerization ◽  
Preliminary Evaluation ◽  
Copaiba Oil
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