A. Mochizuki et al., Polyether-segmented nylon hemodialysis membrane. VII. Studies on surface structures of various poly(ethylene oxide)-segmented nylon membranes, J APPL POLY, 77(3), 2000, pp. 517-528
The relationships of the surface morphologies to the surface chemical compo
sitions in poly(ethylene oxide)-segmented nylon (PEO-Ny) membranes prepared
by the phase-inversion method were studied using scanning electron microsc
opy (SEM), electron spectroscopy for chemical analysis (ESCA), and static s
econdary ion mass spectrometry (SSIMS). The PEG-Ny's used were high semicry
stalline PEO-segmented polyiminosebacoyliminohexamethylene (PEO-Ny610), low
semicrystalline PEO-segmented poly(iminosebacoylimino-m-xylylene) (PEO-NyM
10), and amorphous PEO-segmented poly(iminoisophthaloyliminomethylene-1,3-c
yclohexylenemethylene) (PEO-NyBI). SEM observation showed that the surfaces
of the PEO-Ny610 and PEO-NyM10 membranes were composed of crystalline sphe
rulite and that the PEO-NyBI membrane surface had a nodular structure. ESCA
analysis exhibited the enrichment of the PEO segment at the surfaces of th
e PEO-Ny610 and PEO-NyM10 membranes. On the other hand, the enrichment of t
he Ny segment was observed in the case of the PEO-NyBI membrane. SSIMS anal
ysis revealed that the outermost surfaces of the PEO-Ny membranes except th
e PEO-NyBI membrane were almost covered with the PEO segment. (C) 2000 John
Wiley & Sons, Inc.