Near-monodisperse diblock, triblock, and multiarm star-block copolymers of polystyrene (PS) and poly(4- tert -butylstyrene) (P t BS) were synthesized using anionic polymerization techniques. Selective sulfonation of PS blocks by using the complex of sulfur trioxide (SO 3 ) and triethyl phosphate (TEP) in 1,2-dichloroethane (DCE), followed by neutralization with sodium methoxide, was performed to yield the corresponding well-defined neutral/ionic block copolymers of sodium poly(styrenesulfonate) (NaPSS) and P t BS. A number of techniques including matrix-assisted laser desorption ionization time-of-flight mass spectroscopy (MALDI/TOF/MS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance spectroscopy (NMR) were employed to characterize these materials.
No takes yet. Share an insight, caveat, or question.
Yang et al. (2002) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: