| Abstract
| - Near-monodisperse diblock, triblock, and multiarm star-block copolymers of polystyrene(PS) and poly(4-tert-butylstyrene) (PtBS) were synthesized using anionic polymerization techniques.Selective sulfonation of PS blocks by using the complex of sulfur trioxide (SO3) and triethyl phosphate(TEP) in 1,2-dichloroethane (DCE), followed by neutralization with sodium methoxide, was performed toyield the corresponding well-defined neutral/ionic block copolymers of sodium poly(styrenesulfonate)(NaPSS) and PtBS. A number of techniques including matrix-assisted laser desorption ionization time-of-flight mass spectroscopy (MALDI/TOF/MS), Fourier transform infrared spectroscopy (FT-IR), andnuclear magnetic resonance spectroscopy (NMR) were employed to characterize these materials.
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