Bruno A.,National Graduate School of Chemistry, Montpellier
Macromolecules | Year: 2010
Controlled radical polymerizations (CRP) were pioneered in the late 1970s. Since then, tremendous investigations have been developed, especially from mid-1990s which generated much enthusiasm on CRP. However, the extraordinary scientific development of CRP contrasts with the limited number of commercially available products derived from these technologies. But, for fluoropolymers, the situation is different since iodine transfer polymerization of fluoroalkenes led to commercially available thermoplastic elastomers as soon as 1984. A browse or CRP of fluorinated monomers is presented and is classified into three families: (i) the CRP of fluorine-containing styrenic monomers mainly occur from nitroxide-mediated polymerization (NMP) or by atom radical transfer polymerization (ATRP); (ii) that of fluorinated (meth)acrylic monomers from NMP, ATRP, and in the presence of iniferters; and finally (iii) fluoroalkenes (which is a real challenge since these monomers are gaseous) can be (co)polymerized by iodine transfer polymerization or by processes that required either borinates or xanthates (MADIX). A peculiar interest lies in the CR copolymerization of fluoroalkenes with other comonomers (such as vinylidene fluoride, chlorotrifluoroethylene, 3,3,3-trifluoropropene, hexafluoropropylene, perfluoromethyl vinyl ether, or α-trifluoromethacrylic acid) in the presence of either xanthates, borinates, or iodo compounds. These technologies enable one to generate copolymers that exhibit well-defined architectures, such as telechelic, block, and graft copolymers. Merits and limitations of CRP of F-monomers are also reported. Finally, this Perspective is illustrated by several properties and applications of these fluorinated copolymers (such as surfactants, thermoplastic elastomers, fuel cell and ultrafiltration membranes, dielectrical polymers, optical storage devices, or polycondensates, the fluorinated segments of which bring softness and thermal stability). Hence, CRP can be regarded as a revolutionary method to produce precisely controlled, next-generation specialty fluorinated (co)polymers. © 2010 American Chemical Society. Source
French Atomic Energy Commission, French National Center for Scientific Research and National Graduate School of Chemistry, Montpellier | Date: 2011-02-02
The invention relates to a fluorocarbon polymer material comprising a backbone with the following unit: wherein: m is an integer comprised between 0 and 10, preferably between 0 and 3;
National Graduate School of Chemistry, Montpellier and Arkema | Date: 2012-11-30
The invention relates to a method of preparing a fluorinated copolymer, comprising a step of copolymerization of a fluorinated monomer (of the vinylidene fluoride type) with an -trifluoromethacrylic acid monomer or derivative of -trifluoromethacrylic acid, in the presence of a xanthate or trithiocarbonate compound. The invention also relates to copolymers obtained by this method as well as block copolymers comprising a copolymer block prepared according to this method.
French National Center for Scientific Research, National Graduate School of Chemistry, Montpellier and Montpellier University | Date: 2013-07-08
The invention concerns a mono- or polyfunctional polysilylated organosilane compound, and the method for preparing same.
French National Center for Scientific Research, University Sidi Mohammed Ben Abdellah and National Graduate School of Chemistry, Montpellier | Date: 2013-02-26
A method for the creation of a carbon-carbon (CC) bond or of a carbon-heteroatom (C-HE) bond includes reacting a compound carrying a leaving group with a nucleophilic compound carrying a carbon atom or a heteroatom (HE) capable of replacing the leaving group, thus creating a CC or C-HE bond, in which process the reaction is carried out in the presence of an effective amount of a catalytic system comprising at least one copper/butadienylphosphine complex.