Solid-state supercritical CO2 foaming of PCL and PCL-HA nano-composite: Effect of composition, thermal history and foaming process on foam pore structure

2011 ◽  
Vol 58 (1) ◽  
pp. 158-167 ◽  
Author(s):  
A. Salerno ◽  
E. Di Maio ◽  
S. Iannace ◽  
P.A. Netti
Keyword(s):  
Solid State ◽  
Pore Structure ◽  
Thermal History ◽  
Supercritical Co2 ◽  
Nano Composite ◽  
Composite Effect ◽  
Foaming Process

scholarly journals Influence of Thermoplastic PEG, GLY and Zein in PCL/TZ and HAp Bio Composite via Solid State Supercritical CO2 Foaming

2020 ◽  
Vol 17 (2) ◽  
pp. 177
Author(s):  
Istikamah Subuki ◽  
Suffiyana Akhbar ◽  
Farrah Khalidah Nor Wahid
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Solid State ◽  
Porous Structure ◽  
Supercritical Co2 ◽  
Saturation Pressure ◽  
Thermal Characterization ◽  
Foaming Process ◽  
Scanning Electron

This study is aimed to investigate the characteristics of the composite containing blended poly (ɛ-caprolactone) (PCL), hydroxyapatite (HA) and thermoplastic zein (TZ). Thermoplastic zein was developed by mixing zein with glycerol (GLY) and polyethylene glycol (PEG). The thermal characterization of mixed TZ and bio composite was characterized in order to investigate the characterization of PCL/TZ/HA composites. The bio composited was then moulded and produce porous structure via solid state supercritical carbon dioxide (scCO2) foaming process. The specimen was saturated with CO2 for 6 hours at 50˚C and saturation pressure of 20MPa at high depressurization rate. The morphology of porous specimen produced were characterized by scanning electron microscopy (SEM). The results indicated that after polymer saturation with CO2, high depressurization causes the formation of nucleated gas cells that give rise to pores within the foamed specimens. The blended bio composite with composition of PCL60/TZ20/HAp20 exhibit well interconnected porous structure compared to other bio composite prepared. The foaming effect produce foams with heterogeneous morphologies on bio composite material at relatively low temperature.

Polymeric nanoparticles from macroscopic crystalline monomers by facile solid-state polymerization in supercritical CO2

2009 ◽  
Vol 51 (2) ◽  
pp. 264-269 ◽  
Author(s):  
Hullathy Subban Ganapathy ◽  
Sung Yeol Park ◽  
Won-Ki Lee ◽  
Jong Myung Park ◽  
Kwon Taek Lim
Keyword(s):  
Solid State ◽  
Supercritical Co2 ◽  
Polymeric Nanoparticles ◽  
Solid State Polymerization

Influences of subcritical and supercritical CO2 treatment on the pore structure characteristics of marine and terrestrial shales

2018 ◽  
Vol 28 ◽  
pp. 152-167 ◽  
Author(s):  
Yi Pan ◽  
Dong Hui ◽  
Pingya Luo ◽  
Yan Zhang ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Supercritical Co2 ◽  
Structure Characteristics ◽  
Co2 Treatment

Development of Crystallization in PLA during Solid-State Foaming Process using Sub-Critical CO2

2012 ◽  
Vol 31 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Xiaoxi Wang ◽  
Vipin Kumar ◽  
Wei Li
Keyword(s):  
Solid State ◽  
Foaming Process

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.

scholarly journals Supercritical CO2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3294 ◽  
Author(s):  
Zhenjian Liu ◽  
Zhenyu Zhang ◽  
Xiaoqian Liu ◽  
Tengfei Wu ◽  
Xidong Du
Keyword(s):  
Coal Seam ◽  
Pore Structure ◽  
Adsorption Capacity ◽  
Surface Property ◽  
Supercritical Co2 ◽  
Co2 Adsorption ◽  
Low Pressure ◽  
Coal Seam Gas ◽  
Adsorption Sites ◽  
Co2 Adsorption Capacity

Carbon dioxide (CO2) has been used to replace coal seam gas for recovery enhancement and carbon sequestration. To better understand the alternations of coal seam in response to CO2 sequestration, the properties of four different coals before and after supercritical CO2 (ScCO2) exposure at 40 °C and 16 MPa were analyzed with Fourier Transform infrared spectroscopy (FTIR), low-pressure nitrogen, and CO2 adsorption methods. Further, high-pressure CO2 adsorption isotherms were performed at 40 °C using a gravimetric method. The results indicate that the density of functional groups and mineral matters on coal surface decreased after ScCO2 exposure, especially for low-rank coal. With ScCO2 exposure, only minimal changes in pore shape were observed for various rank coals. However, the micropore specific surface area (SSA) and pore volume increased while the values for mesopore decreased as determined by low-pressure N2 and CO2 adsorption. The combined effects of surface property and pore structure alterations lead to a higher CO2 adsorption capacity at lower pressures but lower CO2 adsorption capacity at higher pressures. Langmuir model fitting shows a decreasing trend in monolayer capacity after ScCO2 exposure, indicating an elimination of the adsorption sites. The results provide new insights for the long-term safety for the evaluation of CO2-enhanced coal seam gas recovery.

Supercritical CO2 deposition and foaming process for fabrication of biopolyester-ZnO bone scaffolds

2017 ◽  
Vol 135 (7) ◽  
pp. 45824 ◽  
Author(s):  
Jasna Ivanovic ◽  
Kurosch Rezwan ◽  
Stephen Kroll
Keyword(s):  
Supercritical Co2 ◽  
Bone Scaffolds ◽  
Foaming Process
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