PLA/PA bio-blends: induced morphology by extrusion

The effect of processing conditions on the final morphology of Poly(Lactic Acid) (PLA) with bio-based Polyamide 10.10 (PA) 70/30 blends is analyzed in this paper. Two types of PLA were used: Commercial (neat PLA) and a rheologically modified PLA (PLAREx), with higher melt elasticity produced by reac...

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Detalles Bibliográficos
Autores: García Masabet, Violeta del Valle|||0000-0002-5362-2896, Santana Pérez, Orlando Onofre|||0000-0003-3040-6848, Cailloux, Jonathan|||0000-0003-3785-0829, Abt, Tobias Martin|||0000-0002-4351-8155, Sánchez Soto, Miguel|||0000-0002-0023-5059, Carrasco Alonso, Félix Ángel|||0000-0001-9477-2703, Maspoch Rulduà, M. Lluïsa|||0000-0002-4813-6412
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/175989
Acceso en línea:https://hdl.handle.net/2117/175989
https://dx.doi.org/10.3390/polym12010010
Access Level:acceso abierto
Palabra clave:Polymers
Biopolymers
PLA
BioPA10.10
PLA/PA Bio-blends
in situ MFCs
Polímers
Biopolímers
Àrees temàtiques de la UPC::Enginyeria química
Descripción
Sumario:The effect of processing conditions on the final morphology of Poly(Lactic Acid) (PLA) with bio-based Polyamide 10.10 (PA) 70/30 blends is analyzed in this paper. Two types of PLA were used: Commercial (neat PLA) and a rheologically modified PLA (PLAREx), with higher melt elasticity produced by reactive extrusion. To evaluate the ability of in situ micro-fibrillation (µf) of PA phase during blend compounding by twin-screw extrusion, two processing parameters were varied: (i) Screw speed rotation (rpm); and (ii) take-up velocity, to induce a hot stretching with different Draw Ratios (DR). The potential ability of PA-µf in both bio-blends was evaluated by the viscosity (p) and elasticity (k’) ratios determined from the rheological tests of pristine polymers. When PLAREx was used, the requirements for PA-µf was fulfilled in the shear rate range observed at the extrusion die. Scanning electron microscopy (SEM) observations revealed that, unlike neat PLA, PLAREx promoted PA-µf without hot stretching and the aspect ratio increased as DR increased. For neat PLA-based blends, PA-µf was promoted during the hot stretching stage. DMTA analysis revealed that the use of PLAREx PLAREx resulted in a better mechanical performance in the rubbery region (T > Tg PLA-phase) due to the PA-µf morphology obtained.

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