High speed separation of ultra-high molecular weight polymers by hyperlayer field-flow fractionation

摘要

A process for high speed separation of ultra-high molecular weight polymers using a hyperlayer field-flow fractionation technique comprising forcing a carrier fluid containing a small sample of the high molecular weight polymer through a thin flow channel possessing an accumulation wall, applying a primary externally controlled driving force transversely across the thin dimension of the channel, adjusting the flowrate of the fluid and the field strength of the primary externally controlled force in relationship to the channel thickness such that at least over part of the molecular weight range the entropic force F.sub.e and the primary driving force F.sub.1 are related by the inequality |F.sub.e . vertline. |F.sub.1 | at the accumulation wall of the channel.