Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR

2008 ◽  
Vol 19 (1) ◽  
pp. 110-114 ◽  
Author(s):  
Xiao Wei Yan ◽  
Xiao Hong Ren ◽  
Siegfried Stapf ◽  
Jing Dai Wang ◽  
Yong Rong Yang
Keyword(s):  
Organic Solvents ◽  
Diffusion Coefficients ◽  
High Density Polyethylene ◽  
High Density ◽  
Self Diffusion ◽  
Polyethylene Particles ◽  
Pfg Nmr

PFG-NMR Measurements of the Self-Diffusion Coefficients of Water in Equilibrium Poly(HEMA-co-THFMA) Hydrogels

2002 ◽  
Vol 3 (3) ◽  
pp. 554-559 ◽  
Author(s):  
Phuong Y. Ghi ◽  
David J. T. Hill ◽  
Andrew K. Whittaker
Keyword(s):  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Pfg Nmr

Measurements of self-diffusion coefficients of monensin in chloroform solution by PFG-NMR

1997 ◽  
Vol 93 (18) ◽  
pp. 3347-3350 ◽  
Author(s):  
Kunihiro Adachi ◽  
Makoto Natsuisaka ◽  
Akihiko Tanioka
Keyword(s):  
Diffusion Coefficients ◽  
Chloroform Solution ◽  
Self Diffusion ◽  
Pfg Nmr

PFG-NMR measurement of self-diffusion coefficients of long-chain α-olefins and their mixtures in semi-crystalline polyethylene

2016 ◽  
Vol 133 (43) ◽  
Author(s):  
Jingyuan Sun ◽  
Meijuan Chen ◽  
Haotong Wang ◽  
Binbo Jiang ◽  
Carlos Mattea ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Self Diffusion ◽  
Pfg Nmr ◽  
Long Chain ◽  
Crystalline Polyethylene

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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