Effect of the unidirectional drawing on the thermal and mechanical properties of PLA films with different L-isomer content
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http://dx.doi.org/10.1002/app.37546 |
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Título
Effect of the unidirectional drawing on the thermal and mechanical properties of PLA films with different L-isomer contentAutoría
Fecha de publicación
2013-02Editor
Wiley Periodicals, Inc.ISSN
0021-8995Cita bibliográfica
VELAZQUEZ‐INFANTE, Julio Cesar, 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, 2013, 127.4: 2661-2669.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://onlinelibrary.wiley.com/doi/10.1002/app.37546/abstractPalabras clave / Materias
Resumen
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 ... [+]
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 [-]
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Journal of Applied Polymer Science, 2013Derechos de acceso
© 2012 Wiley Periodicals, Inc.
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