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dc.contributor.authorKeridou, Ina
dc.contributor.authorFranco García, María Lourdes
dc.contributor.authorValle Mendoza, Luis Javier del
dc.contributor.authorMartínez, Juan Carlos
dc.contributor.authorFunk, Lutz
dc.contributor.authorTuron Dols, Pau
dc.contributor.authorPuiggalí Bellalta, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2021-11-17T08:47:30Z
dc.date.issued2021-01
dc.identifier.citationKeridou, I. [et al.]. Hydrolytic and enzymatic degradation of biobased poly(4-hydroxybutyrate) films. Selective etching of spherulites. "Polymer degradation and stability", 2021, vol. 183, p. 109451:1-109451:11.
dc.identifier.issn0141-3910
dc.identifier.urihttp://hdl.handle.net/2117/356575
dc.description.abstractHydrolytic degradation of poly(4-hydroxybutyrate) (P4HB) films has been studied considering media of different pH values (i.e., 3, 7 and 10) and temperatures (i.e., 37 and 55 °C). Enzymatic degradation has also been evaluated at physiological conditions using two different lipases: Pseudomonas cepacia and Rhizopus oryzae. Different bulk and surface erosion mechanisms with random chain scissions and successive removal of monomer units have been supported through weight loss measurements, molecular weight determinations by GPC and NMR spectroscopy and changes on thermal properties by DSC. Thermal annealing during exposure to different media and even degradation influenced on the melting temperature and crystallinity of samples, as well as on the lamellar geometrical parameters as evaluated by SAXS. Enzymatic degradation was ideal to selectively eliminate the amorphous regions and highlight the spherulitic morphology. Presence of ringed textures were therefore evident in bright field optical micrographs in addition to SEM images, namely observations under polarized light was not necessary to distinguish the presence of banded spherulites. Rhizopus oryzae was revealed to be the most suitable enzyme to crop out the P4HB spherulites that form part of the initial smooth surfaces of solvent casting films. After determining the appropriate activity and exposure time, the presence of rings constituted by cooperative C-shaped edge-on lamellae and flat-on lamellae was highlighted.
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.lcshPolymers--Biodegradation
dc.subject.lcshEnzymatic analysis
dc.subject.otherPoly(4-hydroxybutyrate)
dc.subject.otherBiodegradable polymers
dc.subject.otherHydrolytic degradation
dc.subject.otherEnzymatic degradation
dc.subject.otherFilms
dc.subject.otherThermal properties
dc.subject.otherMicrostructure
dc.titleHydrolytic and enzymatic degradation of biobased poly(4-hydroxybutyrate) films. Selective etching of spherulites
dc.typeArticle
dc.subject.lemacPolímers--Biodegradació
dc.subject.lemacAnàlisi enzimàtica
dc.contributor.groupUniversitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables
dc.identifier.doi10.1016/j.polymdegradstab.2020.109451
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0141391020303803
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac30546500
dc.description.versionPostprint (author's final draft)
dc.date.lift2023-01
local.citation.authorKeridou, I.; Franco, L.; del Valle, LJ.; Martínez, J.; Funk, L.; Turon, P.; Puiggali, J.
local.citation.publicationNamePolymer degradation and stability
local.citation.volume183
local.citation.startingPage109451:1
local.citation.endingPage109451:11


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Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain