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Fages, Jacques
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Topics
Publications (19/19 displayed)
- 2023Foaming of PLA biocomposites by supercritical CO2 assisted extrusion process
- 2023Foaming of PLA biocomposites by supercritical CO2 assisted extrusion process
- 2021PLA-based biocomposites foaming by supercritical CO2 assisted batch process
- 2021PLA-based biocomposites foaming by supercritical CO2 assisted batch process
- 2021Blending and foaming thermoplastic starch with poly (lactic acid) by CO 2 ‐aided hot melt extrusioncitations
- 2021Foaming of PLA-based Biocomposites by Supercritical CO2 Assisted Batch Process : Effect of Processing and Cellulose Fibres on Foam Microstructure
- 2021Foaming of PLA-based Biocomposites by Supercritical CO2 Assisted Batch Process : Effect of Processing and Cellulose Fibres on Foam Microstructure
- 2017Modelling Nucleation and Cell Size During the Continuous Process of Extrusion Assisted by Supercritical CO 2
- 2016Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO 2 assisted extrusioncitations
- 2012Use of supercritical CO2-aided and conventional melt extrusion for enhancing the dissolution rate of an active pharmaceutical ingredientcitations
- 2011On-line rheological measurement of a binary mixture polymer/sc-CO2 in an extruder
- 2011New challenges in polymer foaming: A review of extrusion processes assisted by supercritical carbon dioxidecitations
- 2010Biosourced polymer foam production using a (SC CO2) -assisted extrusion process
- 2008A new supercritical co-injection process to coat microparticlescitations
- 2008Application of the Markov chain theory for modelling residence time distribution in a single screw extruder
- 2007Microencapsulation by a solvent-free supercritical fluid process : use of density, calorimetric, and size analysis to quantify and qualify the coatingcitations
- 2004A new test for cleaning efficiency assessment of cleaners for hard surfacescitations
- 2004Supercritical carbon dioxide : an efficient tool for the production of ultra-fine particles for the food and pharmaceutical industries
- 2002Extraction and precipitation particle coating using supercritical CO2citations
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document
Foaming of PLA biocomposites by supercritical CO2 assisted extrusion process
Abstract
In many industrial fields, the development of porous and lightweight polymer composite structures is of great interest. These structures may have several advantages compared to a massive solid of similar chemical nature, such as better mechanical properties, cushioning, insulation or sound and heat absorption. Three different methods are developed for the foaming of materials: batch, injection and extrusion foaming. These techniques employ highly toxic and harmful substances such as azodicarbonamide as blowing agents, which has increased the use of supercritical fluids as blowing agents, sc-CO2 being the most employed. In addition, petroleum-based thermoplastics are widely used as polymer matrices, but, due to the shortage of fossil resources and the rise of environmental concerns, biopolymers (bio-based and/or bio-degradable, polymers) are more and more used. In this context, the foaming of biopolymers using supercritical CO2 as a blowing agent has become a subject of interest. For this work, polylactic acid (PLA) is employed as the polymer matrix. PLA’s interesting properties have made it the most studied biopolymer, and consequently generated a great amount of interest in different industrial fields. The foaming of PLA biocomposites has been investigated before [1-2], but the effect of fillers on the cellular morphology remains a misunderstood and poorly studied subject. This work aims to explain the effects of size and aspect ratio of a filler as well as its content on the characteristics of PLA foams obtained by supercritical CO2-assisted extrusion process. Short (S) and long (L) cellulose fibres with aspect ratios (lenght/diameter) of 1.5 and 5-7 respectively, have been used as fillers. Fibres were compounded with the polymer through hot melt extrusion at different volume fractions (4 and 12 vol.%) (mass fractions 5 and 15 wt.% respectively). During the extrusion foaming process, two different volumetric flow rates of CO2 were studied (2.5 and 3 mL min-1), and the effect of die temperature was evaluated as well. Techniques as gas pycnometry, scanning electron microscopy (SEM) and modulated differential scanning calorimetry (MDSC) have been used to identify the characteristics of the produced foams.