[en] A well-defined series of nine poly(l-lactide)-b-(2-dimethylaminoethyl methacrylate) (PLLA-b-PDMAEMA) linear diblock copolymers with low polydispersity were prepared by ring-opening polymerization of LLA using 4-isopropylbenzyl alcohol and tin octoate as the initiating system, conversion of the OH-terminated PLLA into Br-terminated macroinitiators (5, 13, and 19 kg/mol), followed by atom transfer radical polymerization of DMAEMA (to obtain one-half, equal, and twice the molecular weight of each PLLA block). Compositional analysis and molecular weight characterization were done using NMR, SEC–LS, TGA, polarimetry, and PDMAEMA quaternization/precipitation to test for residual PLLA homopolymer. DSC investigations indicate that low molecular weight amorphous PLLA or PDMAEMA blocks (less than or equal to ca. 5000 g/mol) are miscible in the second block. Compared to the parent PLLA homopolymers, PLLA crystallization in the block copolymers is significantly retarded, whereas the degree of crystallinity is only mildly affected and melting points are reduced only for the low molecular weight miscible blocks.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Kryuchkov, Maksym A.; University of Montreal, Canada > Department of Chemistry > Centre de recherche sur les mat!eriaux auto-assembl!es (CRMAA/CSACS)
Detrembleur, Christophe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Prud'homme, Robert E.; University of Montreal, Canada > Department of Chemistry > Centre de recherche sur les mat!eriaux auto-assembl!es (CRMAA/CSACS)
Bazuin, C. Géraldine; University of Montreal, Canada > Department of Chemistry > Centre de recherche sur les mat!eriaux auto-assembl!es (CRMAA/CSACS)
Language :
English
Title :
Synthesis and thermal properties of linear amphiphilic diblock copolymers of L-lactide and 2-dimethylaminoethyl methacrylate
Publication date :
12 July 2011
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
American Chemical Society, Washington, United States - District of Columbia
F.R.S.-FNRS - Fonds de la Recherche Scientifique BELSPO - Politique scientifique fédérale MRIF - Gouvernement du Québec. Ministère des Relations internationales et de la Francophonie FRQNT - Fonds de Recherche du Québec - Nature et Technologies NSERC - Natural Sciences and Engineering Research Council MDEI - Ministère de l'Économie et de l'Innovation - Québec
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