Title:
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PLA/PA bio-blends: induced morphology by extrusion
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Author:
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García Masabet, Violeta del Valle; Santana Pérez, Orlando Onofre; Cailloux, Jonathan; Abt, Tobias Martin; Sánchez Soto, Miguel; Carrasco Alonso, Félix Ángel; Maspoch Rulduà, Mª Lluïsa
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Other authors:
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Universitat Politècnica de Catalunya. Doctorat en Ciència i Enginyeria dels Materials; Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials; Universitat Politècnica de Catalunya. e-PLASCOM - Plàstics i Compòsits Ecològics |
Abstract:
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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. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria química -Polymers -Biopolymers -PLA -BioPA10.10 -PLA/PA Bio-blends -in situ MFCs -Polímers -Biopolímers |
Rights:
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Document type:
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Article - Published version Article |
Published by:
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Multidisciplinary Digital Publishing Institute (MDPI)
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