Fracture behavior of quenched poly(lactic acid)
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Otros documentos de la autoría: Gamez-Perez, Jose; Velázquez Infante, Julio César; Franco Urquiza, Edgar A.; Pagès, Pere; Carrasco, Félix; Santana Pérez, Orlando Onofre; Maspoch, Maria Lluïsa
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Título
Fracture behavior of quenched poly(lactic acid)Autoría
Fecha de publicación
2011Editor
BME-PTISSN
1788-618XCita bibliográfica
eXPRESS Polymer Letters, 2011, vol.5, no. 1Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.expresspolymlett.com/letolt.php?file=EPL-0001765&mi=cPalabras clave / Materias
Resumen
The effect of a quenching treatment applied on heated cast sheet extruded films of two poly(lactic acid) (PLA)
commercial grades, with different optical purities, was studied. The thermal and mechanical properties ... [+]
The effect of a quenching treatment applied on heated cast sheet extruded films of two poly(lactic acid) (PLA)
commercial grades, with different optical purities, was studied. The thermal and mechanical properties of the films, as well
as their fracture behavior, were assessed by differential scanning calorimetry (DSC), tensile tests, and the essential work of
fracture (EWF) approach. The heating-quenching treatment causes a de-aging effect with an increase in the free volume of
polymer chains evidenced by a decrease in the glass transition temperature (Tg) and a decrease in the tensile stiffness and
yield stress. As a result, there is an abrupt increase in ductility, finding a dramatic change in the fracture behavior, from brittle
to ductile. The use of digital image correlation (DIC) of the strain field analysis during fracture testing has allowed relating
the decrease on the yield stress promoted by quenching with the crack propagation kinetics. The use of the EWF method
to characterize the fracture toughness of PLA has allowed to measure this enhancement on toughness, finding that the specific
essential work of fracture (We) and the plastic term (βWp) parameters increased 120% and 1200%, respectively, after
the quenching process. [-]
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