Mostra el registre d'ítem simple

dc.contributor.authorAlemán Llansó, Carlos
dc.contributor.authorBertran Cànovas, Òscar
dc.contributor.authorHouk, K.N.
dc.contributor.authorPadias, Anne Buyle
dc.contributor.authorHall, H.K.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física Aplicada
dc.date.accessioned2013-01-31T11:42:00Z
dc.date.created2012-03-01
dc.date.issued2012-03-01
dc.identifier.citationAleman, C. [et al.]. Thermodynamic and stereochemical aspects of the polymerizability of glycolide and lactide. "Theoretical chemistry accounts", 01 Març 2012, vol. 131, núm. 3, p. 1881-1891.
dc.identifier.issn1432-881X
dc.identifier.urihttp://hdl.handle.net/2117/17539
dc.description.abstractThe ring-opening polymerizations of the dilactones glycolide and the S,S- and S,R-stereoisomers of lactide were studied using quantum mechanical methods. The ring strain and the conformational distribution of these cyclic monomers and of the polymers were calculated, and the effect of the medium on the polymerization was predicted, for both bulk and solution. The polymerizability of the three monomers in the gas phase, that is, nonpolar medium, is much greater than that of d-valerolactone or 1,4-dioxan-2-one. This difference vanishes in the polar medium chloroform, which is attributed to the fact that, while all of these monomers possess polar cis-lactone bonds, the three dilactones possess small dipole moments. The data are combined to give polymerization enthalpy and free energy values. The four stereoregular lactide polymers did not differ significantly in energy. Accordingly, the ability to synthesize any one of these rests on catalyst specificity (‘‘polymer chain-end control’’). Although introduction of sterically demanding methyl groups into glycolide is expected to favor coiled conformations and decrease polymerizability, this was not found to be the case. Good agreement of calculated values with experimental data from the literature was achieved.
dc.format.extent11 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshPolymerization
dc.subject.lcshPolyesters
dc.titleThermodynamic and stereochemical aspects of the polymerizability of glycolide and lactide
dc.typeArticle
dc.subject.lemacPolimerització
dc.subject.lemacPolièsters
dc.contributor.groupUniversitat Politècnica de Catalunya. IMEM - Innovació, Modelització i Enginyeria en (BIO) Materials
dc.identifier.doi10.1007/s00214-012-1133-y
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://link.springer.com/article/10.1007/s00214-012-1133-y
dc.rights.accessRestricted access - publisher's policy
drac.iddocument11234993
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
upcommons.citation.authorAleman, C.; Bertran, O.; Houk, K.; Padias, AB; Hall, H.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameTheoretical chemistry accounts
upcommons.citation.volume131
upcommons.citation.number3
upcommons.citation.startingPage1881
upcommons.citation.endingPage1891


Fitxers d'aquest items

Imatge en miniatura

Aquest ítem apareix a les col·leccions següents

Mostra el registre d'ítem simple

Llevat que s'hi indiqui el contrari, els continguts d'aquesta obra estan subjectes a la llicència de Creative Commons: Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya