Infinite Dilution Diffusion Coefficients of Chlorinated Methane in Poly(ethylene terephthalate) by Inverse Gas Chromatography

2014 ◽  
Vol 53 (50) ◽  
pp. 19533-19539 ◽  
Author(s):  
Yi Liu ◽  
Yue Shang ◽  
Guorong Shan
Keyword(s):  
Gas Chromatography ◽  
Diffusion Coefficients ◽  
Infinite Dilution ◽  
Inverse Gas Chromatography ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Chlorinated Methane

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.

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