Obervation of chemical shifts in a bulk crystalline polymer

Wilson, C. W.

doi:10.1002/pol.1962.1205616332

Cited by 13 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) There is 7% of backward added VDF monomers in the long sequence of VDF monomers, in the same manner as found for PVDF molecules. 3 ( 4) When the last monomer of the propagating Polymer J., Vol. 11, No.…”

Section: Comonomer Sequence Distributionsupporting

confidence: 66%

See 1 more Smart Citation

A Fluorine-19 NMR Study of the Microstructure of Vinylidene Fluoride–Trifluoroethylene Copolymers

Yagi

Tatemoto

1979

Polym J

136

View full text Add to dashboard Cite

ABSTRACT:Copolymers ofvinylidene fluoride (VDF) and trifluoroethylene (TRFE) covering the whole range of copolymer compositions were prepared by the bulk-polymerization method using a peroxide as initiator. The monomer reactivity ratios were r A (VDF)= 0. 7 and r8 (TRFE)=0.5. The microstructure of the copolymers was examined by high-resolution 19 F NMR. The normalized monomer-diad and -triad fractions as a function of polymer composition were obtained from NMR line-intensity relationships and numerical calculations using the comonomer-sequence distribution theory suggested by Ito and Yamashita. It was found that the VDF-TRFE copolymer has a statistically random configuration, and the head-to-tail structures ofVDF-TRFE or TRFE-VDF sequences are predominant.

show abstract

Section: Comonomer Sequence Distributionsupporting

confidence: 66%

“…Segment (2) contains one forward added TRFE monomer in the VDF(N) sequence. Segment (3) contains one backward added TRFE monomer in the VDF(N) sequence. The microstructure of segment (I) is the same as that of PVDF.…”

Section: Segment(!): Vd F(n)-vdf(n)-vd F(n) -Vdf(b)-vdf(n)-vdf(n)-vdfmentioning

confidence: 99%

A Fluorine-19 NMR Study of the Microstructure of Vinylidene Fluoride–Trifluoroethylene Copolymers

Yagi

Tatemoto

1979

Polym J

136

View full text Add to dashboard Cite

show abstract

“…163. NMR spectrum of a copolymer of tetrafluoroethylene with hexafluoropropylene (9 ± 1.5 mol.%) at 310°C [716]. to 1.3 A in comparison with 1.5 A for free water.…”

Section: Determination Of the Composition Of Two-phase Systemsmentioning

confidence: 97%

“…A chemical shift was also observed from the resonance of fluorine in the NMR spectrum of a crystalline copolymer of tetrafluoroethylene and hexafluoropropylene [716] and fluoro rubbers [11]. Two-Phase Systems.…”

Section: Manifestation Of a Chemical Shift In The Nmrmentioning

confidence: 99%

“…This problem has been discussed in detail in a monograph [96] and reviews [94,102,122]; conditions affecting the accuracy of the results have been examined [395,547,712], We will only examine one problem that is typical of polymer chemistry, namely, the determination of the composition of copolymers. Figure 163 gives the spectrum of a copolymer of tetrafluoroethylene with hexafluoropropylene [716], recorded at 310°C, i.e., somewhat higher than the melting point of the crystallites. The ratio of the areas of the signals from the CF 3 and CF 2 groups corresponds to a content of 9 ± 1.5 mol.% of hexafluoropropylene.…”

Section: Composition Of Copolymersmentioning

confidence: 99%

See 1 more Smart Citation

The NMR of Polymers

Slonim¹,

Lyubimov²

1995

View full text Add to dashboard Cite

Melt‐spinning process of a tetrafluoroethylene– hexafluoropropylene copolymer

Uno¹,

Miyata²,

Shirai³

2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

An industrial melt-spinning process of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) using an extruder was studied. The novel "spinneret," having both a large-diameter spinning nozzle and a high-temperature vessel, was used to solve the problem of filament breakage on the spinning line caused by high melting viscosity of FEP. The extruder, with its long feed zone, was newly designed to function with a geared pump. The strength of fibers increased with drawing of as-spun fiber. FEP fibers up to six denier were continuously produced through long-run production. According to this new process, FEP fibers can be supplied for textile or industrial application.

show abstract

Obervation of chemical shifts in a bulk crystalline polymer

Cited by 13 publications

References 1 publication

A Fluorine-19 NMR Study of the Microstructure of Vinylidene Fluoride–Trifluoroethylene Copolymers

A Fluorine-19 NMR Study of the Microstructure of Vinylidene Fluoride–Trifluoroethylene Copolymers

The NMR of Polymers

Melt‐spinning process of a tetrafluoroethylene– hexafluoropropylene copolymer

Contact Info

Product

Resources

About