Rights accessRestricted access - publisher's policy
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 (!wp) parameters increased 120% and 1200%, respectively, after
the quenching process.
CitationGamez, J. [et al.]. Fracture behavior of quenched poly(lactic acid). "Express polymer letters", Gener 2011, vol. 5, núm. 1, p. 82-91.
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder. If you wish to make any use of the work not provided for in the law, please contact: firstname.lastname@example.org