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Tytuł pozycji:

Cellulose acetate graft copolymers with nano-structured architectures: Synthesis and characterization

Tytuł :
Cellulose acetate graft copolymers with nano-structured architectures: Synthesis and characterization
Autorzy :
Billy, M.
Da Costa, A. Ranzani
Lochon, Pierre
Clement, R.
Dresch, M.
Etienne, S.
Hiver, Jean-Marie
David, Laurent
Jonquières, Anne
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Temat :
Copolymer morphology
FIBERS
Grafting
METHACRYLATE
[CHIM.POLY]Chemical Sciences/Polymers
Controlled free radical polymerization
TRANSFER RADICAL POLYMERIZATION
[CHIM.MATE]Chemical Sciences/Material chemistry
Atom transfer radical polymerization
DIACETATE
SURFACES
LIGHT-SCATTERING
POLYMERS
ATRP
ETHYL CELLULOSE
Źródło :
European Polymer Journal, Elsevier, 2010, pp.944-957. ⟨10.1016/j.eurpolymj.2010.01.021⟩
Wydawca :
Elsevier, 2010.
Rok publikacji :
2010
Kolekcja :
INRIA_a_CCSD_electronic_archive_server
Hyper_Article_en_Ligne
Język :
English
ISSN :
1873-1945
0014-3057
DOI :
10.1016/j.eurpolymj.2010.01.021
Numer akcesji :
edsair.dedup.wf.001..a1d8bd0fcecdb5702a141daea642e784
International audience; Cellulose acetate is a very good film-forming polymer with major applications in cigarette filters, photographic films, cosmetics and pharmaceutics formulations and membrane separation processes. Nevertheless, its rigidity and relative hydrophobic character can be limiting drawbacks for some applications. In this work, new cellulose acetate materials with highly flexible and hydrophilic grafts were obtained with different hydrophilic/hydrophobic balances. Cellulose acetate was grafted with methyl diethylene glycol methacrylate (MDEGMA) from brominated macroinitiators by atom transfer radical polymerization (ATRP) in two steps. The first step consisted of introducing ATRP initiator groups on cellulose acetate by reacting hydroxyl side groups with 2-bromoisobutyryl bromide. A preliminary study was then carried out to determine the experimental conditions for the controlled ATRP of MDEGMA homopolymerization in a solvent (cyclopentanone) compatible with cellulose acetate grafting. In these conditions, the MDEGMA homopolymerization followed Hanns Fischer's kinetics model accounting for the radical persistent effect. The ATRP grafting was then investigated for two cellulose acetate macroinitiators differing in the number of their ATRP initiator groups. Two families of graft copolymers with nano-structured architectures were obtained. The first family corresponded to copolymers with a high number of short grafts. The copolymers of the second family had almost the same graft weight fractions but a small number of long grafts. The morphology of the graft copolymers was then investigated by synchrotron X-ray scattering. The most informative results showed that the phase segregation depended upon the number and length of the poly(MDEGMA) grafts. The copolymer with 44 wt.% of long grafts showed a segregated morphology of nano-domains with sharp interfaces and a radius of gyration of 11.5 nm (from Guinier's law). These cellulose acetate copolymers eventually led to strong films with potential applications in membrane separations.

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