English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/103087
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Tautomeric acetoacetate monomers as building units of functional copolymers

AuthorsGiussi, Juan M.; Blaszczyk-Lezak, Iwona; Sanz, Belén; Allegretti, Patricia E.; Mijangos, Carmen ; Cortizo, M. Susana
KeywordsThermal properties
Radical polymerization
Tautomeric equilibrium
NMR spectroscopy
Nanostructure
Styrenic acetylacetates copolymers
Issue Date2014
PublisherElsevier
CitationEuropean Polymer Journal 59: 84- 93 (2014)
AbstractAlthough synthetic polymers from tautomeric functional monomers have emerged as a new kind of materials due to potential applications their interest needs still to be revealed. In this work we have synthesized two series of tautomeric acetoacetate copolymers, with different composition, microstructure and properties. We have selected allyl acetoacetate (AAA) and 2-(acetoacetoxy)ethyl methacrylate (AEMA) monomers to copolymerize with styrene (St). The bulk copolymerization initiated with azobisisobutyronitrile was carried out at 60 °C for different monomer feed compositions and times. The products were characterized by 1H NMR, HSQC NMR and size exclusion chromatography. The calculated monomer reactivity ratio obtained for poly(St-co-AAA) and for poly(St-co-AEMA), show noteworthy differences in the copolymerization behavior; r1r2 take values near 1 and zero for poly(St-co-AAA) and poly(St-co-AEMA), respectively. The glass transition temperature (Tg) values for copolymers were determined by differential scanning calorimetry. Two Tg temperatures were found for poly(St-co-AAA) which were close to the Tg values of corresponding homopolymers. On the other hand, only one Tg values characterized the St-co-AEMA copolymers system. Thermal stability has been studied by thermo gravimetric analysis (TGA). The copolymers St-co-AAA and St-co-AEMA exhibited higher thermal stability than homopolymer AAA and AEMA, respectively. Due to the functional group present in both monomers, they exhibit tautomeric equilibrium; an interesting NMR study in solution allowed us to demonstrate that the displacement of equilibrium depends on composition, microstructure and solvents. In view of future applications as nanomatrices for tissue engineering, these tautomeric copolymers (St-co-AAA), were nanostructured in AAO nanocavities and its morphological and surface characteristics analyzed by SEM.
URIhttp://hdl.handle.net/10261/103087
DOI10.1016/j.eurpolymj.2014.07.009
Identifiersdoi: 10.1016/j.eurpolymj.2014.07.009
issn: 0014-3057
e-issn: 1873-1945
Appears in Collections:(ICTP) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.