Infinite Dilute Activity and Diffusion Coefficients in Polymers by Inverse Gas Chromatography

2006 ◽  
Vol 51 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Chuyi Zeng ◽  
Jiding Li ◽  
Ding Wang ◽  
Tianquan Chen ◽  
Changwei Zhao ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Diffusion Coefficients ◽  
Inverse Gas Chromatography ◽  
And Diffusion

scholarly journals Determination of Diffusion Coefficients of Selected Long Chain Hydrocarbons using Reversed- Flow Gas Chromatographic Technique

2011 ◽  
Vol 8 (4) ◽  
pp. 1916-1924 ◽  
Author(s):  
Khalisanni Khalid ◽  
Rashid Atta Khan ◽  
Sharifuddin Mohd Zain
Keyword(s):  
Gas Chromatography ◽  
Diffusion Coefficients ◽  
Elution Curve ◽  
Mathematical Expression ◽  
Chromatographic Technique ◽  
Reversed Flow ◽  
Future Studies ◽  
And Diffusion ◽  
Long Chain

The reversed-flow gas chromatography (RF-GC) technique was used to study the evaporation rate and estimating the diffusion coefficient of samples. The RF-GC system comprises of six-port valve, sampling and diffusion column, detector and modified commercial gas chromatography machine. Selected long chain of hydrocarbons (99.99% purity) was used as samples. The solute (stationary phase) were carried out by carrier gas (mobile phase) to the detector. The data obtained from the RF-GC analysis were analysed by deriving the elution curve of the sample peaks using mathematical expression to find the diffusion coefficients values of respective liquids. The values obtained were compared with theoretical values to ensure the accuracy of readings. The interesting findings of the research showed the theoretical values of equilibrium at liquid-gas interphase lead to profound an agreement with the experimental evidence, which contributes for the references of future studies.

Infinite dilution diffusion coefficients of organic solvents in nascent polyethylene particles by inverse gas chromatography measurements

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Xiaowei Yan ◽  
Jingdai Wang ◽  
Yibin Shan ◽  
Yongrong Yang ◽  
Chao He
Keyword(s):  
Gas Chromatography ◽  
Organic Solvents ◽  
Diffusion Coefficients ◽  
Infinite Dilution ◽  
Inverse Gas Chromatography ◽  
Particle Morphology ◽  
Spherical Particles ◽  
Reactor Outlet ◽  
Free Volume Theory ◽  
Polyethylene Particles

AbstractDiffusion coefficients of four organic solvents: dichloromethane, trichloromethane, tetrachloromethane and n-hexane in polyethylene particles at infinite dilution were determined by use of inverse gas chromatography (IGC). The polymer particles were used as supplied by the producer to pack the chromatographic columns. This allowed a direct measurement of the interested properties in a particle with the same morphology obtained at the reactor outlet. The particle morphology was investigated and classical mathematical model for chromatographic process was adopted based upon the analysis of particle microstructure. It was found that the limitation step for mass transfer was in the polymer matrix rather than in macropores, and when interpreted in terms of diffusion coefficients for spherical particles, the measured diffusion coefficients compared favourably with predicted values from literature relationships and free volume theory.

scholarly journals Phase equilibrium and diffusion of solvents in polybutadiene: A capillary-column inverse gas chromatography study

2002 ◽  
Vol 40 (10) ◽  
pp. 1046-1055 ◽  
Author(s):  
W. D. Cai ◽  
N. Ramesh ◽  
F. Tihminlioglu ◽  
R. P. Danner ◽  
J. L. Duda ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Phase Equilibrium ◽  
Inverse Gas Chromatography ◽  
Capillary Column ◽  
And Diffusion
Sign in / Sign up

Export Citation Format

Share Document