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

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Title:	Influence of crystallinity on the fracture toughness of poly(lactic acid)/montmorillonite nanocomposites prepared by twin-screw extrusion
Author:	Gamez Pérez, José; Nascimento, L.; Bou Serra, Jordi; Franco Urquiza, Edgar Adrian; Santana Pérez, Orlando Onofre; Carrasco Alonso, Félix Ángel; Maspoch Rulduà, Mª Lluïsa
Other authors:	Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. ENGIBIO - Enginyeria i Biotecnologia; Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia
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.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers -Montmorillonite -Polymers--Properties -Thermoplastics -Termoplàstics -Polímers -- Propietats -Biopolímers
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Document type:	Article - Published version Article
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