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.
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