Untitled

The syntheses of poly(vinylidene fluoride)-b-poly(styrene) (PVDF-b-PS) block copolymers, from the iodine transfer polymerization (ITP) of styrene, in the presence of PVDF-I, are presented. In a first step, considering that the radical polymerization of vinylidene fluoride can lead to two different isomeric oligomers, bearing either -CH 2 I or -CF 2 I end groups, the kinetics of ITP of styrene in the presence of two chain transfer agents, C 6 F 13 -CH 2 CF 2 -I and HCF 2 -CF 2 CH 2 -I, were achieved as model reactions. The characterization of sampled aliquots by 19 F NMR spectroscopy could monitor the average degree of polymerization in number (DP n ) vs styrene conversion (R Styrene ). ITPs of styrene with both these chain transfer agents showed two opposite behaviors, also confirmed by MALDI-TOF spectroscopy and SEC chromatography. (i) on the one hand, in the presence of C 6 F 13 -CH 2 CF 2 -I, the controlled character of ITP of styrene was evidenced (a linear dependence of DP n vs R Styrene was observed), theoretical DP n values were close to those of the targeted ones, with low polydispersity indexes (PDI ) 1.5) and the transfer constant value was assessed (C Tr = 1); (ii) on the other hand, using HCF 2 -CF 2 CH 2 -I as the chain transfer agent, ITP of styrene did not occur since only a direct initiation for the polymerization of styrene was noted, with DP n value higher than the targeted one and a broad polydispersity distribution (PDI > 2). In a second part, PVDF-b-PS block copolymers were synthesized via a two step-procedure, ITP of VDF in the presence of C 6 F 13 I as the chain transfer agent leading to C 6 F 13 (VDF) n -I oligomers and, subsequently, ITP of styrene using those latter oligomers as macromolecular chain transfer agents. These block copolymers were characterized by 19 F and 1 H NMR and MALDI-TOF spectroscopies, and by SEC chromatography. Their morphological and thermal properties were also studied by atomic force microscopy (AFM) and by differential scanning calorimetry (DSC), respectively.

show abstract

“…Other synthesis of fluorinated block copolymers have been reported and Table summarizes different strategies. ,,,,− …”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)-b-poly(styrene) Block Copolymers by Iodine Transfer Polymerization (ITP): Synthesis, Characterization, and Kinetics of ITP

et al. 2006

View full text Add to dashboard Cite

show abstract

Random and block styrenic copolymers bearing both ammonium and fluorinated side‐groups

Valade

Boschet

Améduri

2011

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

1H,1H,2H,2H‐Perfluorooctyloxymethylstyrene (FS) was prepared and copolymerized with chloromethylstyrene (CMS). Conventional radical copolymerization of both these aromatic monomers led to poly(CMS‐co‐FS) random copolymers for which CMS was shown to be more reactive than the fluorinated comonomer. Their controlled radical copolymerization based on degenerative transfer, namely iodine transfer polymerization (ITP), led to various poly(CMS)‐b‐poly(FS) block copolymers. Molecular weights of poly(CMS‐co‐FS) copolymers reached 33,000 g mol−1 while those of poly(CMS)‐b‐ poly(FS) block copolymers were 22,000 g mol−1. Their composition ranged from 18 to 61 mol.% in FS. These copolymers were modified via a cationization step, aiming at replacing the chlorine atom in CMS unit by a trimethylammonium group, leading to the formation of cationic sites. The resulting functionalized copolymers exhibited different solubilities. If both copolymerization techniques led to water‐insoluble copolymers, the block architecture enabled incorporating lower FS proportion, resulting in more cationic sites. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

show abstract

Untitled

Cited by 2 publications

References 0 publications

Poly(vinylidene fluoride)-b-poly(styrene) Block Copolymers by Iodine Transfer Polymerization (ITP): Synthesis, Characterization, and Kinetics of ITP

Poly(vinylidene fluoride)-b-poly(styrene) Block Copolymers by Iodine Transfer Polymerization (ITP): Synthesis, Characterization, and Kinetics of ITP

Random and block styrenic copolymers bearing both ammonium and fluorinated side‐groups

Contact Info

Product

Resources

About