High resolution nuclear magnetic resonance of fluoro polymers.  2.  Fluorine-19 spectra and chain structure of poly(vinylidene fluoride)

Ferguson, Raymond C.; Brame, E. G.

doi:10.1021/j100474a010

Cited by 40 publications

(17 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As expected, the head‐to‐tail VDF units (i.e., produced from normal VDF propagation) of the VDF block are represented by a group of signals in the −91 to −95 ppm range, while the signals centered at −113 and −116 ppm are assigned to the reversed VDF units (i.e., head‐to‐head VDF chaining). These attributions are in good agreement with those already described by various authors for low40 or high molecular weight PVDF,41–48 or for telomers of VDF with perfluoroalkyl iodides,9,13,35,36 α , ω ‐diiodoperfluoroalkanes,37 methanol,2,3 polyhalogenomethanes9–14 or diethyl hydrogen phosphonate 7,8…”

Section: Resultssupporting

confidence: 91%

Synthesis and copolymerization of vinylidene fluoride (VDF) with Trifluorovinyl Monomers, 11

Améduri¹,

Boutevin²,

Kostov³

2002

Macromol. Chem. Phys.

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 91%

Synthesis and copolymerization of vinylidene fluoride (VDF) with Trifluorovinyl Monomers, 11

Améduri¹,

Boutevin²,

Kostov³

2002

Macromol. Chem. Phys.

View full text Add to dashboard Cite

“…-sequences, respectively for the low molecular weight (Figure 1) 58 . These sequences correspond to the reverse VDF addition (i.e., head-to-head addition) [59][60][61][62] . Moreover, the presence of -SF 5 monomer is confirmed by an The compositions of monomeric -CF 2 -CF(SF 5 ), VDF and HFP units in the terpolymers were assessed by 19 F NMR (e.g., Figure 1) from equations 4, 5 and 6, respectively:…”

Section: Characterizations Of the Poly(vdf-ter-hfp-ter-sf 5 M) Terpolmentioning

confidence: 99%

Radical Terpolymerization of 1,1,2-Trifluoro-2-pentafluorosulfanylethylene and Pentafluorosulfanylethylene in the Presence of Vinylidene Fluoride and Hexafluoropropylene by Iodine Transfer Polymerization

et al. 2008

View full text Add to dashboard Cite

Iodine transfer terpolymerization of two monomers bearing an SF 5 group, i.e. 1,1,2-trifluoro-2-pentafluorosulfanylethylene (F 2 C=CFSF 5) and pentafluorosulfanylethylene (H 2 C=CHSF 5), with 1,1-difluoroethylene (or vinylidene fluoride, VDF) and hexafluoropropylene (HFP) is presented. These pentafluorosulfanyl monomers present a peculiar reactivity. They do not homopolymerize by conventional radical polymerization, but they co-and terpolymerize with the above fluorinated olefins. The resulting fluorinated terpolymers were characterized by 19 F and 1 H NMR spectroscopies which enabled the assessment of the molar percentages of the three comonomers. Size exclusion chromatography and NMR characterizations were also used to assess the molecular weights, M n , ranging between 260 and 8 400 g/mol. Interestingly, both these pentafluorosulfanyl monomers exhibit different behaviors in that radical terpolymerization in the presence of C 6 F 13 I as a degenerative chain transfer agent. Thus, CF 2 CFSF 5 can be terpolymerized with VDF and HFP with a good control of molecular weight leading fluoropolymers bearing SF 5 groups with low polydispersity index (PDI). Unexpectedly, only two iodide functionalities of the terpolymers namely two end-groups (-CH 2 CF 2 I and-CF 2 CH 2 I) were observed and their proportions were influenced by the number of VDF units. Indeed,-CH 2 CF 2 I functionality decreased when the number of VDFs per chain increased. In contrast to 1,1,2-trifluoro-2-pentafluorosulfanyl ethylene, H 2 C=CHSF 5 could not be terpolymerized by ITP but led to C 6 F 13-[(CH 2 CF 2)-(CH 2 CH(SF 5)] n-I alternating cooligomers of low molecular weight in poor yields (10-20%). The formation of by-product (C 6 F 13 CH=CHSF 5 monoadduct obtained by dehydrofluorination) was also observed, which corresponds to the elimination of HI from the 1:1 adduct. In the last part, the thermal properties were discussed. The presence of SF 5 group decreases the Tg of fluoropolymers whereas the thermal stabilities depended on the molecular weights.

show abstract

“…Epitaxial crystallisation of a copolymer of vinylidene fluoride and vinyl fluoride (molar ratio 95/5) has been investigated. 5 ' The crystallisation was carried out from a 0.1% solution in nitrobenzene at 90-105 °C onto the 001 planes of NaCl and KC1 crystals. Lamellar crystals with a rod-like morphology are formed in both cases (according to electron microscope data).…”

Section: A' A" A' A' A" A" A'mentioning

confidence: 99%

The structure and properties of block poly(vinylidene fluoride) and systems based on it

1996

View full text Add to dashboard Cite

High resolution nuclear magnetic resonance of fluoro polymers. 2. Fluorine-19 spectra and chain structure of poly(vinylidene fluoride)

Abstract: Publication costs assisted by E.

Cited by 40 publications

References 6 publications

Synthesis and copolymerization of vinylidene fluoride (VDF) with Trifluorovinyl Monomers, 11

Synthesis and copolymerization of vinylidene fluoride (VDF) with Trifluorovinyl Monomers, 11

Radical Terpolymerization of 1,1,2-Trifluoro-2-pentafluorosulfanylethylene and Pentafluorosulfanylethylene in the Presence of Vinylidene Fluoride and Hexafluoropropylene by Iodine Transfer Polymerization

The structure and properties of block poly(vinylidene fluoride) and systems based on it

Contact Info

Product

Resources

About