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Butyllithium-initiated anionic synthesis of well-defined poly(styrene-block-ethylene oxide) block copolymers with potassium salt additives

✍ Scribed by Roderic P. Quirk; Jungahn Kim; Charles Kausch; Moonseok Chun

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 569 KB
Volume: 39
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199601)39:1<3::aid-pi436>3.0.co;2-o

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✦ Synopsis

Poly(styrene-block-ethylene oxide) (PS-PEO) diblock copolymers have been synthesized with predictable block molecular weights and narrow molecular weight distributions. sec-Butyllithium-initiated polymerization of styrene was effected in benzene solution followed by w-end-group functionalization with ethylene oxide to form the corresponding polymeric lithium alkoxide (PSOLi). Block copolymerization of ethylene oxide initiated by the unreactive PSOLi was promoted by addition of dimethylsulfoxide and either potassium t-butoxide, potassium t-amyloxide or potassium 2,6-di-t-butylphenoxide. Although the PS-PEO block copolymer product contained some poly(ethy1ene oxide) homopolymer, the poly(ethy1ene oxide) block M, was in good agreement with the calculated value and the molecular weight distribution of the final block was generally narrow (Mw/Mn 5 1.1). The amount of PEO homopolymer was minimized using potassium 2,6-di-t-butylphenoxide rather than potassium t-alkoxides.

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