PLA/PA in situ microfibrillated composite bioblends for customized additive manufacturing
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/180485
Correu electrònic de l'autorsergi.bafaluy-ojea2etu.univ-lorraine.fr
Realitzat a/ambUniversité de Lorraine
Tipus de documentProjecte Final de Màster Oficial
Data2019-02-20
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
This project, having taken place in the Centre Català del Plàstic, is focused on the production and
characterization of biobased blends of poly (lactic acid) (Ingeo 4032D) modified with a multi-epoxide
agent (Joncryl ADR 4400) and a partially biobased polyamide (Zytel RS LC3060 NC010). The main goal
of the project, being to obtain a blend with enhanced thermal and mechanical properties compared to
its pure components.
It consists on a previous study in a lab scale of the development of blends for a pilot plant production,
for that, the first step of the project consisted on the determination of the optimal content of multiepoxide agent and the analysis of the effect of using antioxidants. With this in mind, different grades
of PLAREx were produced by using an internal mixer with blending parameters similar to those of
extrusion processes and the ability of the materials to maintain a certain thermal stability to avoid
degradation of its thermomechanical properties during mixing at high temperatures (235 °C) was
analysed.
Next, once the appropriate grade of chain extender was defined, the thermal stability of the different
PLAREx/PA blends was evaluated by changing the composition from the 10 to the 50 wt.% of PA to
determine the optimal mixing time. To compare with, the raw materials and PLA/PA blends were also
processed under the same conditions.
Once specified the suitable mixing time, the final blends were produced, and plates were obtained
from them by compression moulding in a press. Following, these plates were morphologically,
thermally and mechanically characterised.
The morphological analysis showed a typical structure of immiscible polymer blends, with one phase
conforming the matrix (PLA) and the other dispersed into the matrix as droplets or fibrils depending
on its own composition (PA). An effect of the addition of a multi-epoxide agent on the morphology was
also noticed, reducing the size of the PA droplets and moving the composition at which phase inversion
takes place to higher PA contents.
In addition, the different thermal transitions and their evolution with the PA content showing the
typical behaviour of immiscible polymer blends as well. Interferences between both polymers were
observed in terms of the crystallisation processes taking place.
Finally, the tensile test results demonstrate a transition from a fragile to a ductile behaviour by
increasing the PA amount of the blend.
TitulacióMOBILITAT INCOMING
Fitxers | Descripció | Mida | Format | Visualitza |
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Memoria_TFM_Sergi_Bafaluy_Ojea.pdf | 6,049Mb | Visualitza/Obre |