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Surface interactions in a shear field
Author(s) -
Dietsche Laura J.,
Denn Morton M.,
Bell Alexis T.
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410521
Subject(s) - adsorption , attenuated total reflection , fourier transform infrared spectroscopy , fourier transform , shear rate , shear stress , volumetric flow rate , infrared , shear (geology) , surface (topology) , field (mathematics) , chemical physics , materials science , flow (mathematics) , chemistry , mechanics , chemical engineering , composite material , optics , geometry , physics , engineering , mathematics , quantum mechanics , viscosity , pure mathematics
The dynamics of chain exchange between flowing bulk melt and the channel wall were studied for oligomeric polyolefins using attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FTIR). The dynamics are dominated by a surprisingly slow first‐order process which depends on flow rate and materials of construction of the channel wall. The picture which seems to emerge is an entropically‐driven flow‐rate‐ (or stress‐) dependent adsorption equilibrium which retards the exchange between the surface and bulk.