Acid/base characterization of sepiolite by inverse gas chromatography

1991 ◽  
Vol 31 (7-8) ◽  
pp. 357-361 ◽  
Author(s):  
E. Morales ◽  
M. V. Dabrio ◽  
C. R. Herrero ◽  
J. L. Acosta
Keyword(s):  
Gas Chromatography ◽  
Inverse Gas Chromatography ◽  
Acid Base

scholarly journals Surface Thermo-Dynamic Characterization of Poly (Vinylidene Chloride-Co-Acrylonitrile) (P(VDC-co-AN)) Using Inverse-Gas Chromatography and Investigation of Visual Traits Using Computer Vision Image Processing Algorithms

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1631
Author(s):  
Vijay Kakani ◽  
Hakil Kim ◽  
Praveen Kumar Basivi ◽  
Visweswara Rao Pasupuleti
Keyword(s):  
Image Processing ◽  
Gas Chromatography ◽  
Inverse Gas Chromatography ◽  
Average Particle ◽  
Dynamic Characterization ◽  
Acid Base ◽  
Vinylidene Chloride ◽  
Surface Character ◽  
Particle Area

The Inverse Gas Chromatography (IGC) technique has been employed for the surface thermo-dynamic characterization of the polymer Poly(vinylidene chloride-co-acrylonitrile) (P(VDC-co-AN)) in its pure form. IGC attributes, such as London dispersive surface energy, Gibbs free energy, and Guttman Lewis acid-base parameters were analyzed for the polymer (P(VDC-co-AN)). The London dispersive surface free energy ( γ S L ) was calculated using the Schultz and Dorris–Gray method. The maximum surface energy value of (P(VDC-co-AN )) is found to be 29.93 mJ·m − 2 and 24.15 mJ·m − 2 in both methods respectively. In our analysis, it is observed that the γ S L values decline linearly with an increase in temperature. The Guttman–Lewis acid-base parameter K a , K b values were estimated to be 0.13 and 0.49. Additionally, the surface character S value and the correlation coefficient were estimated to be 3.77 and 0.98 respectively. After the thermo-dynamic surface characterization, the (P(VDC-co-AN)) polymer overall surface character is found to be basic. The substantial results revealed that the (P(VDC-co-AN)) polymer surface contains more basic sites than acidic sites and, hence, can closely associate in acidic media. Additionally, visual traits of the polymer (P(VDC-co-AN)) were investigated by employing Computer Vision and Image Processing (CVIP) techniques on Scanning Electron Microscopy (SEM) images captured at resolutions ×50, ×200 and ×500. Several visual traits, such as intricate patterns, surface morphology, texture/roughness, particle area distribution ( D A ), directionality ( D P ), mean average particle area ( μ a v g ) and mean average particle standard deviation ( σ a v g ), were investigated on the polymer’s purest form. This collective study facilitates the researches to explore the pure form of the polymer Poly(vinylidene chloride-co-acrylonitrile) (P(VDC-co-AN )) in both chemical and visual perspective.

Characterization of dispersive and acid-base properties of crosslinked polymers by inverse gas chromatography

Polymer ◽  
1993 ◽  
Vol 34 (14) ◽  
pp. 3109-3111 ◽  
Author(s):  
A. Voelkel ◽  
E. Andrzejewska ◽  
R. Maga ◽  
M. Andrzejewski
Keyword(s):  
Gas Chromatography ◽  
Inverse Gas Chromatography ◽  
Acid Base ◽  
Crosslinked Polymers ◽  
Base Properties
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