Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends

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 gen...

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Autores principales:	Vito Gigante, Luca Bosi, Paola Parlanti, Mauro Gemmi, Laura Aliotta, Andrea Lazzeri
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	poly(lactic) acid (PLA) rubber toughening microscopy damage mechanisms dilatational bands Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/af1acd44f07f484388d04b090f3bb695
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spelling	oai:doaj.org-article:af1acd44f07f484388d04b090f3bb6952021-11-25T18:49:46ZAnalysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends10.3390/polym132240532073-4360https://doaj.org/article/af1acd44f07f484388d04b090f3bb6952021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/4053https://doaj.org/toc/2073-4360The 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.Vito GiganteLuca BosiPaola ParlantiMauro GemmiLaura AliottaAndrea LazzeriMDPI AGarticlepoly(lactic) acid (PLA)rubber tougheningmicroscopydamage mechanismsdilatational bandsOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 4053, p 4053 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	poly(lactic) acid (PLA) rubber toughening microscopy damage mechanisms dilatational bands Organic chemistry QD241-441
spellingShingle	poly(lactic) acid (PLA) rubber toughening microscopy damage mechanisms dilatational bands Organic chemistry QD241-441 Vito Gigante Luca Bosi Paola Parlanti Mauro Gemmi Laura Aliotta Andrea Lazzeri Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
description	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.
format	article
author	Vito Gigante Luca Bosi Paola Parlanti Mauro Gemmi Laura Aliotta Andrea Lazzeri
author_facet	Vito Gigante Luca Bosi Paola Parlanti Mauro Gemmi Laura Aliotta Andrea Lazzeri
author_sort	Vito Gigante
title	Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
title_short	Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
title_full	Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
title_fullStr	Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
title_full_unstemmed	Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends
title_sort	analysis of the damage mechanism around the crack tip for two rubber-toughened pla-based blends
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/af1acd44f07f484388d04b090f3bb695
work_keys_str_mv	AT vitogigante analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends AT lucabosi analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends AT paolaparlanti analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends AT maurogemmi analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends AT lauraaliotta analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends AT andrealazzeri analysisofthedamagemechanismaroundthecracktipfortworubbertoughenedplabasedblends
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Analysis of the Damage Mechanism around the Crack Tip for Two Rubber-Toughened PLA-Based Blends

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