Effect of the Processing-Induced Morphology on the Mechanical Properties of Biodegradable Extruded Films Based on Poly(lactic acid) (PLA) Blends

被引:0
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作者
Mathilde Siccardi
Xoan Xosé Garcia-Fonte
Antoine Simon
Valeria Pettarin
María José Abad
Celina Bernal
机构
[1] Universidad de Buenos Aires,Grupo de Propiedades Mecánicas y Fractura, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN
[2] Facultad de Ingeniería,UBA
[3] Universidad de Buenos Aires,CONICET)
[4] Facultad de Ingeniería,Grupo de Polímeros, Universidad de A Coruña, Centro de Investigaciones Tecnológicas
[5] Escuela Universitaria Politécnica,Grupo de Ciencia e Ingeniería de Polímeros
[6] INTEMA (UNMdP-CONICET),undefined
来源
Journal of Polymers and the Environment | 2019年 / 27卷
关键词
Biodegradable polymers; Poly(lactic acid); Polymer blends; Mechanical properties; Processing-induced morphology;
D O I
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中图分类号
学科分类号
摘要
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.
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页码:2325 / 2333
页数:8
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