Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 1 of 1
Full-Text Articles in Engineering
Characterization Of The Block Microstructure In Block Copolymer Ionomers Using Small Angle X-Ray Scattering, S. Mani, Robert Weiss, C. E. Williams, S. F. Hahn
Characterization Of The Block Microstructure In Block Copolymer Ionomers Using Small Angle X-Ray Scattering, S. Mani, Robert Weiss, C. E. Williams, S. F. Hahn
Robert Weiss
The block microstructure of a series of diblock copolymer ionomers was investigated using synchrotron small-angle x-ray scattering (SAXS). The base materials used were poly[styrene-b-(ethylene/propylene)] (SEP) diblock copolymers with a constant total molecular weight of ca. 50 kg/mol, but three different compositions : 20.3 wt%, 35.6 wt% and 50.4 wt% polystyrene (PS). The polystyrene microphase structures for these unmodified diblock copolymers were cylindrical, lamellar and lamellar, respectively. Ionomers were synthesized from the block copolymers by lightly sulfonating the PS blocks, followed by neutralization to the sodium and zinc salts. The introduction of ionic species into the PS blocks perturbed the block …