Skip to Main content Skip to Navigation
Theses

Synthèse de polyesters et polycarbonates : polymérisation en milieu homogène en vue d'une utilisation en milieu hétérogène permettant le recyclage de l'initiateur de polymérisation

Abstract : Over the last sixty years, polyolefin-based plastics (for instance polystyrene, polyethylene, polypropylene) have considerably been developed, to become, with nearly 50 millions of tons produced in Europe in 2009 (250 millions of tons in the world), the most used materials today. Polyolefins are made from non renewable fossil resources (petrochemical origin), more and more rare and expensive. Moreover, these materials pose an environmental problem, mostly concerning their elimination after their use (waste storage, pollution…). As a consequence, biodegradable and biocompatible polymers may be a viable alternative to petrochemical-based plastics and are already used in domains such as packaging, biomedical tools or nanotechnologies. The advantages of these polymers are to limit the use of fossil energies, as they may derive from renewable resources (wheat, soybean, corn…). The life cycle of these products involves a restitution of the withdrawn resources via their biodegradation and the analyses of this life cycle show a lower impact on the different environmental factors (global warming, rain acidification, ground nitrification, ozone emission, etc…) and a lower use of energy end CO2 emission than those of the usually used materials. The low use of these materials, although in high increase, is partially due to their cost, which is five to ten times higher to the one of traditional plastics, and to their weaker thermal and mechanical resistances. Today, the problematic is to create unexpensive materials possessing improved physical properties. Aliphatic polyesters and polycarbonates (poly(lactic acid) (PLA), poly(s-caprolactone) (PCL), poly(trimethylene carbonate) (PTMC)) have received increasing attention over the last years. They can be obtained via different ways, but the method of choice to allow a controlled polymerization (controlled chain length and tacticity of the polymer) is the ring-opening polymerization (ROP). This PhD work has focused on the synthesis of well-defined group 13 complexes for their application as initiators for the controlled ROP of cyclic esters and carbonates.
Document type :
Theses
Complete list of metadatas

Cited literature [48 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00832499
Contributor : Abes Star :  Contact
Submitted on : Monday, June 10, 2013 - 6:02:10 PM
Last modification on : Friday, July 20, 2018 - 11:14:07 AM
Long-term archiving on: : Wednesday, September 11, 2013 - 4:15:37 AM

File

HILD_Frederic_2012_ED222.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00832499, version 1

Collections

Citation

Frédéric Hild. Synthèse de polyesters et polycarbonates : polymérisation en milieu homogène en vue d'une utilisation en milieu hétérogène permettant le recyclage de l'initiateur de polymérisation. Autre. Université de Strasbourg, 2012. Français. ⟨NNT : 2012STRAF037⟩. ⟨tel-00832499⟩

Share

Metrics

Record views

942

Files downloads

11190