Influence of crystallinity on the fracture toughness of poly(lactic acid)/montmorillonite nanocomposites prepared by twin-screw extrusion

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dc.contributor	Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.contributor	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.contributor	Universitat Politècnica de Catalunya. ENGIBIO - Enginyeria i Biotecnologia
dc.contributor	Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia
dc.contributor.author	Gamez Pérez, José
dc.contributor.author	Nascimento, L.
dc.contributor.author	Bou Serra, Jordi
dc.contributor.author	Franco Urquiza, Edgar Adrian
dc.contributor.author	Santana Pérez, Orlando Onofre
dc.contributor.author	Carrasco Alonso, Félix Ángel
dc.contributor.author	Maspoch Rulduà, Mª Lluïsa
dc.date	2011-04-15
dc.identifier.citation	Gamez, J. [et al.]. Influence of crystallinity on the fracture toughness of poly(lactic acid)/montmorillonite nanocomposites prepared by twin-screw extrusion. "Journal of applied polymer science", 15 Abril 2011, vol. 120, núm. 2, p. 896-905.
dc.identifier.citation	0021-8995
dc.identifier.citation	10.1002/app.33191
dc.identifier.uri	http://hdl.handle.net/2117/11935
dc.language.iso	eng
dc.relation	http://onlinelibrary.wiley.com/doi/10.1002/app.33191/abstract
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
dc.subject	Montmorillonite
dc.subject	Polymers--Properties
dc.subject	Thermoplastics
dc.subject	Termoplàstics
dc.subject	Polímers -- Propietats
dc.subject	Biopolímers
dc.title	Influence of crystallinity on the fracture toughness of poly(lactic acid)/montmorillonite nanocomposites prepared by twin-screw extrusion
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	The aim of this work was to study the effect of crystallinity degree on the thermal, mechanical, and fracture properties of poly(lactic acid)/organomodified montmorillonite (PLA/OMMT) nanocomposites. Samples with two different compositions (0.5 and 2.5% weight OMMT in PLA) were prepared by melt mixing in a twin-screw extruder and injection molding. An annealing treatment was applied to increase the percentage of PLA crystallinity. The thermal behavior was analyzed by differential scanning calorimetry (DSC), and the mechanical properties were determined via tensile tests and the fracture behavior using the linear elastic fracture mechanics theory, using SENB specimens at low and high testing rates. Gel permeation chromatography (GPC) from granulates and injected specimens were also carried out, finding some polymer degradation during extrusion and injection processes. The results show a toughening effect of the nanocomposites on amorphous specimens but embrittlement on the annealed ones.
dc.description.abstract	Peer Reviewed

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