Carbon dioxide as reagent for the carbonatation of epoxidized polymers and copolymers : from batch process to reactive extrusion
- Authors
- Publication Date
- Dec 12, 2023
- Source
- HAL-Descartes
- Keywords
- Language
- English
- License
- Unknown
- External links
Abstract
The aim of this project is to develop polymer materials harnessing reactive extrusion with modular functionalities by implementing sustainable chemistry based on the use of carbon dioxide as a carbon source.The core of the study is to introduce cyclic carbonate functions from CO2, via carbonatation reactions, on industrial polymers to modify their physico-chemical characteristics such as polarity, crystallinity, and reactivity without limiting their recyclability. The project's challenge is to apply such chemical modifications to polyolefins in a single-step reactive extrusion process by treating the reactive system under high carbon dioxide pressure.During this thesis, three axes of research were explored. The first is the carbonatation of industrial polymers containing epoxy pendant groups using CO2 as reagent and ammonium salts as organocatalysts. The transposition of this modification from a batch process to reactive extrusion was particularly studied. The second axe is the oxidative carbonatation of unsaturated polyolefins in two steps in a batch reactor using peracids and CO2 as reagents, and ammonium salts as organocatalysts. Finally, the last axis is the valorization of these carbonated polymers as intermediates for the synthesis of isocyanate-free polyurethanes and as compatibilizing agents for polyethylene/polycarbonate blends.
