Effect of the unidirectional drawing on the thermal and mechanical properties of PLA films with different L-isomer content
| Autor: | M. Ll. Maspoch, Félix Carrasco, Orlando O. Santana, Edgar Franco-Urquiza, J. C. Velazquez-Infante, Jose Gamez-Perez |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
tensile properties
Materials science Polymers and Plastics Annealing (metallurgy) poly-lactic acid (PLA) Infrared spectroscopy Polymers--Testing Enginyeria dels materials::Materials plàstics i polímers [Àrees temàtiques de la UPC] General Chemistry Crystal structure Biopolímers -- Proves thermoforming Surfaces Coatings and Films Amorphous solid Resistència estructural Differential scanning calorimetry Enginyeria dels materials::Assaig de materials::Assaigs estructurals [Àrees temàtiques de la UPC] Biopolymers Polímers -- Proves Ultimate tensile strength Materials Chemistry Composite material mesomorphic phase Thermal analysis Thermoforming |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | This 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, during, 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 analysis. 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/75°C), if compared with those needed for similar amorphous PLA specimens (60 min/120°C), thus providing a processing opportunity for obtaining thermally stable PLA products at temperatures above 100°C. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 |
| Databáze: | OpenAIRE |
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