A5059026770- Polymer Foaming and Composites
- Phase Equilibria and Thermodynamics
- Carbon dioxide utilization in catalysis
- Injection Molding Process and Properties
- Polymer composites and self-healing
- Enhanced Oil Recovery Techniques
Laboratoire de Chimie des Polymères Organiques
2020-2024
Université de Bordeaux
2022-2024
Centre National de la Recherche Scientifique
2022-2024
Institut Polytechnique de Bordeaux
2022-2023
Catalyse
2020-2022
Organic polymers can be made porous via continuous or discontinuous expansion processes in scCO2. The resulting foams properties are controlled by the interplay of three groups parameters: (i) Chemical, (ii) physico-chemical, and (iii) technological/process that explained this paper. advantages drawbacks (extrusion, injection foaming) (batch foaming scCO2, will discussed article; especially for micro nano cellular polymers. Indeed, a challenge is to reduce both specific mass (e.g., ρ <...
Abstract A strategy of CO 2 ‐assisted extrusion foaming PMMA‐based materials was established to minimize both foam density and porosities dimension. First a highly ‐philic block copolymer (MAM: PMMA‐PBA‐PMMA) added in PMMA order improve saturation before foaming. Then the extruding conditions were optimized maximize uptake prevent coalescence. The temperature reduction led an increase pressure barrel, favorable cell size reduction. With combination material formulation strategy, very...
Abstract This work addresses the structural quantification of multiphase materials, here nanostructured polymer solid precursors and their micro/nano sized foamed counterparts. It is based on a strategy contrast/edge enhancement, locally adaptive to image data in digital images materials. The method allows binarize straightforwardly structures (the phases) TEM SEM after edge identification, choice, virtual reconstruction. A detailed insight brought into one‐step batch supercritical CO 2...
The two-step batch foaming process of solid-state assisted by supercritical CO2 is a versatile technique for the polymers. In this work, it was an out-of-autoclave technology: either using lasers or ultrasound (US). Laser-aided only tested in preliminary experiments; most work involved US. Foaming carried out on bulk thick samples (PMMA). effect cellular morphology function temperature. Thanks to US, cell size slightly decreased, density increased, and interestingly, thermal conductivity...
Multiphase materials composed of several phases with smooth interphases or sharp interfaces are ubiquitous in polymer science. This study addresses the challenge to identify and segment automatically right electronic digital images for a sound analysis structuration at micro-/nanoscale. The selected strategy is primarily enhance contrast between transmission electron microscopy/scanning microscopy straightforward subsequent segmentation phases, i.e., by simple threshold gray-level intensity...
One-step solid-state batch scCO2 foaming is used with the target of achieving acrylic polymer micro or nanofoams. Foaming triggered by a pressure drop, choosing broad range average drop rates (PDR) (from 0.3 to 30 MPa.s-1). This study principally addresses combined beneficial effects block copolymer addition and high PDR. Numerous subtle kinetic parameters actually interplay compete in production foams. In particular, material effective temperature, glass transition temperature plasticized...