Computer Study of Chromatographic Separation Process: A Monte Carlo Study of H-Shaped and Linear Homopolymers in Good Solvent

摘要

The partitioning, of linear (L) and H-shaped polymers between bulk solvent and narrow pores with inert and attractive Walls and the conformational behavior of chains in pores was studied by Monte Carlo simulations. The polymer chains were modeled as self-avoiding walks in a good solvent. The concentration profiles in the pores, partition coefficients KH and KD and various structural characteristics were calculated as, functions of pore size and interaction parameter epsilon, ranging from a to -0.26. K-H is, higher than K-L in pores with nonattractive walls, but the difference decreases with increasing vertical bar epsilon vertical bar. Both partition coefficients equal for epsilon* ca. -0.2, and later their sequence inverts. epsilon* depends only slightly on chain architecture and chain length. The results are important from the experimental point of view because they show that the improperly chosen experimental conditions Can deteriorate SEC analysis of branched samples.