Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2011 m. Nr. 4 Synthesis of anionic amphiphilic molecular brushes by conventional free-radical and raft terpolymerizations
Molecular bottle-brushes consisting of statistical terpolymers of poly(ethylene oxide) monomethyl ether methacrylate (PEOMEMA), lauryl methacrylate (LMA) and methacrylic acid (MAA) were synthesized by conventional free-radical and RAFT terpolymerizations. To perform RAFT terpolymerization, two chain transfer agents, S-(2-cyano-2-propyl)-S-dodecyltrithiocarbonate (CTA1) and 4-cyano-4-(dodecylsulfanylthiocarbonyl) sulfanyl pentanoic acid (CTA2), were used. It was determined that the relatively hydrophilic CTA2 controls PEOMEMA, LMA and MAA terpolymerization better than CTA1 does. Terpolymers synthesized in the presence of CTA1 were characterized by bimodal MWD and moderate polydispersity (up to Mw / Mn = 1.5), while terpolymers synthesized in the presence of CTA2 were monodisperse. RAFT terpolymerization of PEOMEMA, LMA and MAA enabled to synthesize brush terpolymers with low composition distribution and a more homogeneous distribution of PEO side chains along the mainchain.
Keywords: RAFT, molecular brush, macromonomer, terpolymerization, composition |
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