Synthesis of Tri- and multiblock polymers with asymmetric poly(ethylene oxide) end blocks

Athanasios Touris, Sangwoo Lee, Marc A. Hillmyer, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report the anionic synthesis of poly(ethylene oxide-b-isoprene-b- ethylene oxide) (OIO') triblock copolymers and poly(ethylene oxide-b-styrene-b-butadiene-b-ethylene oxide) (OSBO') tetrablock terpolymers with asymmetrically sized poly(ethylene oxide) (PEO) end blocks using triisopropylsilyloxy-1-propyllithium (TIPSOPrLi) as a protected initiator and diphenylmethyl potassium (DPMK) as the base activator for EO polymerization. All final products and precursors were characterized by size exclusion chromatography (SEC) and nuclear magnetic resonance (NMR) techniques confirming monomodal and narrow molecular weight distributions and controlled molar masses. The growth of independently controlled PEO blocks was additionally demonstrated by the characterization of residual PEO blocks obtained from the ozonolysis of OIO'. (Figure presented)

Original languageEnglish (US)
Pages (from-to)768-771
Number of pages4
JournalACS Macro Letters
Volume1
Issue number6
DOIs
StatePublished - Dec 1 2012

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