Effect of the Processing-Induced Morphology on the Mechanical Properties of Biodegradable Extruded Films Based on Poly(lactic acid) (PLA) Blends
- 37 Downloads
Biodegradable films based on poly(lactic acid) blends were obtained by cast extrusion. Their tensile and fracture behavior was investigated and the effect of the processing conditions through the extrusion rolling speed on this behavior was analyzed. In uniaxial tensile tests, all films presented completely ductile behavior exhibiting a defined yield point, strain softening after this point and a plateau before fracture. Fracture behavior was determined through quasi-static fracture tests on deeply double edge notched tensile specimens. The film obtained at the lowest rolling speed exhibited completely ductile behavior hence, the Essential Work of Fracture methodology was applied to characterize its fracture. The film processed at intermediate rolling speed, on the other hand, presented ductile fracture or ductile instability depending on the ligament length and the film obtained with the highest rolling speed exhibited a transition regime fracture. In order to compare the fracture behavior of the different films, the J-integral at maximum load Jmax was adopted. Differences in the films fracture behavior were correlated to the processing-induced morphology.
KeywordsBiodegradable polymers Poly(lactic acid) Polymer blends Mechanical properties Processing-induced morphology
The authors want to thank the National Research Council of Argentina (CONICET) and the University of Buenos Aires (UBACyT 20020130200282BA) for financial support of this investigation.
Compliance with Ethical Standards
Conflict of interest
The authors confirm that this article content has no conflict of interest.
- 15.Todo M, Arakawa K, Tsuji H, Takenoshita Y (2004) In: Conference 2004, SEM X international congress & exposition on experimental & applied mechanics, Costa Mesa, CAGoogle Scholar
- 21.Technical data sheet Bio-Flex F 6510. https://fkur.com/wp-content/uploads/2017/01/TD_BIO-FLEX_F_6510_EN.pdf
- 22.Technical data sheet Bio-Flex F 2110. https://fkur.com/wp-content/uploads/2016/10/TD_BIO-FLEX_F_2110_en.pdf
- 29.Cotterell C, Reddel JK (1997) Int J Fract 13:267Google Scholar
- 39.Struik LGE (1978) Physical aging in amorphous polymers and other materials. Elsevier, AmsterdamGoogle Scholar
- 46.Todo M, Takayama T (2011) In: Pignatello R (ed) Biomaterials—physics and chemistry. InTech, Rijeka, p 375Google Scholar