Investigation into the rheological properties of PES/NMP/nonsolvent membrane‐forming systems

Wiley - Tập 82 Số 2 - Trang 283-291 - 2001
Zhansheng Li1, Chengzhang Jiang1
1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

Tóm tắt

AbstractFrom the perspective of a polymer solution, the rheological properties of the popular polyethersulfone (PES)/N‐methyl‐2‐pyrrolidone (NMP)/nonsolvent (NS) membrane‐forming system were investigated thoroughly with a controlled stress rheometer (HAAKE RS75, Germany). The scope of the study included measurements of the controlled‐stress flow curve, creep recovery, and dynamic oscillation. H2O, 1‐butanol, ethylene glycol, and diethylene glycol were used as NS additives. The effects of the polymer concentration and the quality of the solvent mixture, as characterized by the approaching ratio, on the rheological behavior of the dopes were studied. Up to 38 wt % PES and extremely adjacent to the phase separation (i.e., the approaching ratio of the dope was 0.95), the viscous property dominated all the dopes, which behaved as Newtonian fluids. Moreover, all the membrane‐forming dopes investigated were in the crossover regime in the semidilute region, in which the chains were overlapping but unentangled. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 283–291, 2001

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Wiley

Tập 82 Số 2

283-291

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