Polymères porteurs d’hétéro-atomes


 

Fluoropolymers

 

At IAM, fluorinated telomers or polymers can be synthesized by key methodologies such as the telomerization and the conventional and controlled radical (co)polymerization (RDRP) of fluorinated monomers. The team possesses a specific equipment to handle toxic and/or corrosive gases with sometimes unknown reactivity, including high pressure autoclaves, and has in stock most of commercially available key monomers (vinylidene fluoride, VDF, chlorotrifluoroethylene, CTFE, hexafluoropropylene, HFP, perfluoromethyl vinylther, PMVE and, more recently, trifluoroethylene, TrFE, and 2,3,3,3-tetrafluoropropene, 1234yf and ze).

Both basic aspects (assessments of the chain transfert constants in telomerization and degenerative transfer reactions, as well as reactivity ratios in radical copolymerizations) and applied researches are currently developed in IAM. All these tools and reactants are used to develop high value added-materials. Specific projects are carried out within national and international, academic and industrial collaborations. More specifically, the team has been involved in various actions dealing with the synthesis of fluorinated surfactants (especially alternatives to perfluorooctanoic acid, PFOA, and perfluorooctane sulfonic acid, PFOS, that are bioaccumulable, toxic, and persistent), high performance fluoroelastomers (collaboration with DuPont, USA), fluoropolymer/nanofillers nanocomposites, and materials for Energy (mainly fuel cell membranes-alkaline, protonic and quasi anhydrous-, but also solvents and polymer electrolytes for Lithium ion batteries, electroactive-such as ferro- and piezoelectrics- and photovoltaic films).

 

Phosphonated polymers

For 30 years, the IAM team worked on the development of phosphorus-containing polymers by various strategies of synthesis, the chemical post-modification of polymers, the conventional radical polymerization and finally the controlled radical polymerization. These various synthetic approaches were used to develop complex polymer structures, depending on the intended application. In addition, these approaches require the synthesis of novel phosphorus-containing monomers to be use in different applications such as membranes for fuel cells, coatings for protection against corrosion, flame retardants, complexing agents and vectoring active principles. Through these applications, the IAM team turns to the association of phosphorus and bio-based resources. Through these projects, the team diversifies the synthetic routes and turns to greener methods to obtain new phosphorus biobased polymers. Specific projects are carried out within national and international, academic and industrial collaborations such as DGA, AirBus, Protex, Solvay, CEA…
For metal coatings for anti-corrosion through collaboration with the CIRIMAT, the IAM team has evolved phosphorus containing photopolymerizable polymers (acrylate type) to new generations of polymer coatings from bio-based resources such as oils, cardanol or chitosan bearing phosphonic acid functions. These coatings have better resistance to steel corrosion promoting migration of phosphonic acid functions to the metal.


 

Properties of Fluorinated and Phosphonated Polymers

 

Scientific Features and Challenges

 

Control of the structure of polymers containing F and/or P :

  • Specific Position of such hetero-atoms in the polymer chain
  • Obtaining of complex structures (block, graft, alternated copolymers, dendrimers, …)
 

Improvement of the physico-chimical properties of polymers based on F and/or P :

  • Increase of molar masses
  • Chemical or Physical Crosslinking
 

National / International situation

 

Institut Charles Gerhardt Montpellier - Direction

UMR 5253 - CNRS/UM/ENSCM
  • Université de Montpellier
  • Place Eugène Bataillon
  • CC 1700 - Bâtiment 17 -1er étage
  • Tel: +33 (0)4 67 14 93 50
  • Email: direction@icgm.fr
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