Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/52352
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
Internet: http://pubs.acs.org/doi/full/10.1021/ma0497254
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

Files in This Item:
marc.xml9.8 kBXMLView/Open

MARC21 XML metadata

Show full item record
Export via OAI-PMH Interface in XML Formats
Export to Other Non-XML Formats

WEB OF SCIENCETM
Citations 1

61
checked on Jun 2, 2020

Page view(s)

172
checked on Jan 7, 2020

Download(s)

10
checked on Jan 7, 2020

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.