Characterization and adsorptive properties of poly(1-vinylimidazole)/silica nanocomposites synthesized in supercritical carbon dioxide

e-Polymers ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 245-254 ◽  
Author(s):  
Wei Wang ◽  
Liqin Cao ◽  
Jide Wang ◽  
Jie Zhao ◽  
Xiujuan Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Metal Ion ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
One Pot ◽  
Nanocomposite Particles ◽  
Silica Nanocomposite ◽  
Supercritical Carbon

AbstractPoly(1-vinylimidazole) (PVIm)/silica nanocomposite particles were prepared via free radical polymerization of VIm in the presence of unmodified silica and crosslinker N,N′-methylenebisacrylamide without any surfactant by a one-pot route in supercritical carbon dioxide. The strong acid-base interaction between the hydroxyl groups (acidic) of silica surfaces and the imidazole groups (basic) of 1-VIm was strong enough to promote the formation of long-stable PVIm/silica nanocomposite particles. Transmission electron microscopy and scanning electron microscopy results showed that the silica nanoparticles were encapsulated into the polymer and with a specific pore structure. Fourier transform infrared spectroscopy results suggested the strong interaction between PVIm and silica. The nanocomposites were shown to possess higher thermal stability than PVIm. A maximum surface area of 60.76 m2/g was obtained via standard nitrogen adsorption analysis. The property of the composite materials in terms of heavy metal ion removal was investigated. The maximum adsorption capacity of Cr (VI) is 331.5 mg/g in the experimental range.

scholarly journals Impregnation of poly(L-lactide-ran-δ-valerolactone) with essential bark oil using supercritical carbon dioxide

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chikara Tsutsumi ◽  
Souta Manabe ◽  
Susumu Nakayama ◽  
Yuushou Nakayama ◽  
Takeshi Shiono
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Azeotropic Distillation ◽  
Proteinase K ◽  
High Yield ◽  
Feed Ratio ◽  
One Pot ◽  
Molecular Weights ◽  
Hydrolysis Process ◽  
Supercritical Carbon

Abstract This work studied the incorporation of essential bark oil from Thujopsis dolabrata var. hondae, which is known to repel various insects, in poly(L-lactide-ran-δ-valerolactone) [poly(L-LA-ran-VL)] using supercritical carbon dioxide (scCO2). The poly(L-LA-ran-VL) was synthesized by first purifying the monomers by azeotropic distillation with benzene, followed by polymerization with Sn(oct)2 using the same equipment, representing an efficient one-pot process. The copolymerization of L-LA with VL using this technique at a feed ratio of 90/10 mol/mol gave poly(L-LA-ran-VL) (91/9) with a molecular weight of 6.48 × 104 g/mol and a high yield of 74.9%. Products with molecular weights over 5.0 × 104 g/mol were obtained at L-LA feed proportions of 70 to 90%. Impregnation trials were conducted between 40 and 120 °C at 14 MPa for 3 h. The oil content of a 73/27 specimen was found to increase significantly during processing at 100 or 120 °C. During enzymatic degradation with proteinase K, the 91/9 specimen showed the fastest degradation rate. Although the 71/29 sample was slowly hydrolyzed in a phosphate buffer at pH 7.0, the release of oil vapor from this material was slightly higher than that from the 91/9 specimen, and the vapor release rate continuously increased throughout the hydrolysis process.

One-Pot Procedure to Synthesize High Surface Area Alumina Nanofibers Using Supercritical Carbon Dioxide

Langmuir ◽  
2010 ◽  
Vol 26 (4) ◽  
pp. 2707-2713 ◽  
Author(s):  
Muhammad B. I. Chowdhury ◽  
Rouhong Sui ◽  
Rahima A. Lucky ◽  
Paul A. Charpentier
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
One Pot ◽  
Alumina Nanofibers ◽  
Supercritical Carbon

Synthesis of Macroporous PMMA/Silica Nanocomposite Monoliths in Supercritical Carbon Dioxide

2005 ◽  
Vol 26 (17) ◽  
pp. 1406-1411 ◽  
Author(s):  
Baohua Yue ◽  
Jun Yang ◽  
Chien-Yueh Huang ◽  
Rajesh Dave ◽  
Robert Pfeffer
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Silica Nanocomposite ◽  
Supercritical Carbon

scholarly journals Water/oil repellent property of polyester fabrics after supercritical carbon dioxide finishing

2015 ◽  
Vol 19 (4) ◽  
pp. 1273-1277 ◽  
Author(s):  
Yan-Yan Xu ◽  
Lai-Jiu Zheng ◽  
Fang Ye ◽  
Yong-Fang Qian ◽  
Jun Yan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Air Permeability ◽  
Infrared Spectrometry ◽  
Fourier Transform Infrared Spectrometry ◽  
Polyester Fabrics ◽  
Oil Repellent ◽  
Scanning Electron ◽  
Supercritical Carbon

The strong permeability and driving force of supercritical carbon dioxide renders it an ideal medium for fabrics finishing. This paper is to use supercritical carbon dioxide medium with a solution of organic fluorine to fabricate water/oil repellent polyester fabrics. A series of characterization methods including Fourier transform infrared spectrometry, energy dispersive spectrometry, and scanning electron microscopy were carried out to evaluate the fabrics finishing. Fourier transform infrared spectrometry showed that the transmittance peak appeared at 1202.4 and 1147.4 cm-1, indicating the presence of -CF2- group on the surface of polyester fabrics. The results of energy dispersive spectrometer and scanning electron microscopy showed that the fluorine was evenly distributed on the fibers surface. In addition, a series of physical properties were detected, including contact angel, air permeability, breaking strength, and wearing resistance. The average water and hexadecane contact angles were 147.58? and 143.78?, respectively. Compared with the initial fabrics, the treated one has little change in air permeability, while its strength increased greatly. The treated fabrics gained good water/oil repellent properties while keeping good air permeability and improving mechanical property.

Hydrogenation of Phenol in Supercritical Carbon Dioxide Catalyzed by Palladium Supported on Al-MCM-41: A Facile Route for One-Pot Cyclohexanone Formation

2009 ◽  
Vol 351 (11-12) ◽  
pp. 1912-1924 ◽  
Author(s):  
M. Chatterjee ◽  
H. Kawanami ◽  
M. Sato ◽  
A. Chatterjee ◽  
T. Yokoyama ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
One Pot ◽  
Facile Route ◽  
Mcm 41 ◽  
Supercritical Carbon
Sign in / Sign up

Export Citation Format

Share Document