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dc.contributor.authorVelázquez Infante, Julio Cesar
dc.contributor.authorGamez Pérez, José
dc.contributor.authorFranco Urquiza, Edgar Adrian
dc.contributor.authorSantana Pérez, Orlando Onofre
dc.contributor.authorCarrasco, F
dc.contributor.authorMaspoch Rulduà, Mª Lluïsa
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.identifier.citationVelázquez-Infante, J.C. [et al.]. Effect of the unidirectional drawing on the thermal and mechanical properties of PLA films with different L -isomer content. "Journal of applied polymer science", 15 Febrer 2013, vol. 127, núm. 4, p. 2661-2669.
dc.description.abstractThis work simulates the thermoforming process of two different L-isomer content PLA grades (95.6 and 98%), studying the influence on the induced morphology and the variation in the thermal and tensile properties. The thermoforming process was simulated with uniaxial tensile tests performed at different temperatures and strain rates, reporting the tensile behavior before, dur-ing, and after the test. The resulting structural changes were analyzed by wide-angle X-ray scattering and Fourier transformed infrared spectroscopy. Thermal characterization was carried out with differential scanning calorimetry and dynamomechanical thermal analy-sis. The results showed that, regardless the L-isomer content, drawing at 70 C produced a stable mesomorphic phase that showed greater tensile properties than the original films. This mesomorphic phase, indeed, could be reordered into a crystalline structure under mild annealing conditions (5 min/75C), if compared with those needed for similar amorphous PLA specimens (60 min/120C), thus providing a processing opportunity for obtaining thermally stable PLA products at temperatures above 100C.
dc.format.extent9 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials::Assaigs estructurals
dc.subject.othermesomorphic phase
dc.subject.otherpoly-lactic acid (PLA)
dc.subject.othertensile properties
dc.titleEffect of the unidirectional drawing on the thermal and mechanical properties of PLA films with different L -isomer content
dc.subject.lemacPolímers -- Proves
dc.subject.lemacBiopolímers -- Proves
dc.subject.lemacResistència estructural
dc.contributor.groupUniversitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorVelázquez-Infante, J.C.; Gámez-Pérez, J.; E Franco-Urquiza; Santana, O.; Carrasco, F.; Maspoch, M.
local.citation.publicationNameJournal of applied polymer science

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