期刊
POLYMERS
卷 13, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/polym13224053
关键词
poly(lactic) acid (PLA); rubber toughening; microscopy; damage mechanisms; dilatational bands
The study investigated the toughening mechanisms of poly(lactic acid; PLA) blended with two different elastomers, PBAT and POE-g-GMA, showing an improvement in PLA performance. PBAT appeared as spheres while POE-g-GMA had a dual sphere/fibre morphology. Damage was mainly generated by shear yielding deformation in the subcritical crack tip damaged zone.
The toughening mechanisms of poly(lactic acid; PLA) blended with two different elastomers, namely poly (butylene adipate-co-terephtalate; PBAT) and polyolefin elastomers with grafted glycidyl methacrylate (POE-g-GMA), at 10 and 20 wt.%, were investigated. Tensile and Charpy impact tests showed a general improvement in the performance of the PLA. The morphology of the dispersed phases showed that PBAT is in the form of spheres while POE-g-GMA has a dual sphere/fibre morphology. To correlate the micromechanical deformation mechanism with the macroscopical mechanical behaviour, the analysis of the subcritical crack tip damaged zone of double-notched specimens subjected to a four-point bending test (according to the single-edge double-notch four-point bend (SEDN-4PB) technique) was carried out using several microscopic techniques (SEM, polarized TOM and TEM). The damage was mainly generated by shear yielding deformation although voids associated with dilatational bands were observed.
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