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Type of publication: Straipsnis Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or / and Scopus (S1)
Field of Science: Chemija / Chemistry (N003)
Author(s): Masci, Giancarlo;Bontempo, Debora;Tiso, Nicola;Diociaiuti, Marco;Mannina, Luisa;Capitani, Donatella;Crescenzi, Vittorio
Title: Atom transfer radical polymerization of potassium 3-sulfopropyl methacrylate:  direct synthesis of amphiphilic block copolymers with methyl methacrylate
Is part of: Macromolecules. Washington, DC : ACS Publications, 2004, vol. 37, iss. 12
Extent: p. 4464-4473
Date: 2004
Keywords: Potassium;Copolymers;Polymerization
Abstract: The synthesis of potassium 3-sulfopropyl methacrylate (SPMA) homopolymers and amphiphilic block copolymers with methyl methacrylate (MMA) by ATRP in water/DMF mixed solvent at 20 °C using a Cu/bipyridine catalyst and halogen exchange is described. SPMA homopolymerization in pure water was poorly controlled even when 200% of Cu(II)Cl2 with respect to Cu(I)Cl was added, leading to a relatively high polydispersity (1.38). In water:DMF 50:50 (v/v), addition of at least 60% of Cu(II)Cl2 with respect to Cu(I)Cl allowed to obtain a good control of the polymerization. Linear kinetic plots up to very high conversion were observed and the final polydispersities were relatively low (1.15−1.25). Good self-blocking efficiencies were demonstrated by chain extension experiments even when the first block conversion before the addition of the second feed was very high (>90%). Amphiphilic block copolymers with MMA (number-average degree of polymerization Xn,SPMA = 50, Xn,MMA = 25) were directly prepared in water:DMF 40:60 (v/v) without using protecting group chemistry or post-polymerization derivatization. The first-order kinetic plot for MMA polymerization was linear up to 96% conversion. Two block copolymers with the same composition, p(SPMA50-b-MMA25)1pot and p(SPMA50-b-MMA25)2pot, were prepared with “one-pot” and “two-pot” procedures. p(SPMA50-b-MMA25)2pot prepared using a purified pSPMA macroinitiator for MMA polymerization gave well-defined core−shell spherical micelles with an average hydrodynamic radius of about 14 nm determined by dynamic light scattering (DLS) measurements. p(SPMA50-b-MMA25)1pot prepared using the sequential monomer addition gave large micellar clusters (more than 100 nm) in addition to simple but smaller micelles. A tentative explanation to the presence of the larger aggregates was given
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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