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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

 2010 m. Nr. 1

Synthesis of amphiphilic diblock copolymer brushes by successive RAFT polymerization of lauryl methacrylate and PEO-containing macromonomer
Tatjana KRIVOROTOVA, Emilija UDRĖNAITĖ, Daniel GROMADZKI, Ričardas MAKUŠKA

Reversible addition-fragmentation chain transfer (RAFT) polymerization of lauryl methacrylate (LMA) in the presence of S-methoxycarbonyl phenylmethyl dithiobenzoate (MCPDB) as a RAFT chain transfer agent (CTA) and subsequent RAFT polymerization of poly(ethylene oxide) monomethyl ether methacrylate (PEO5MEMA or PEO45MEMA) was done with the aim to prepare amphiphilic diblock copolymer brushes of controlled structure. The molecular weight of PLMA and PLMA-b-PPEO5MEMA copolymers was evaluated by several methods including SEC calibrated using polystyrene standards, and end-group analysis by 1H NMR and UV-Vis. The kinetics of LMA polymerization was followed by 1H NMR spectroscopy by comparing the signals attributed to the monomer and corresponding monomeric units in PLMA. RAFT polymerization of LMA at the ratio [MCPDP] : [AIBN] = 4 demonstrated the “living” character enabling to synthesize PLMA with a low polydispersity (Mw / Mn = 1.08–1.19) and a relatively high molecular weight (Mn up to 60 000, degree of polymerization DP up to 260). Several diblock copolymers PLMA-b-PPEO5MEMA with various lengths of the blocks and a high molecular weight (Mn up to 300 000) were prepared and characterized. RAFT polymerization of PEO45MEMA from PLMA as a macro-CTA failed.

Keywords: RAFT, macromonomer, PEO, diblock copolymer, amphiphilic copolymer
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