The effect of alkali salt on solvent–polyacrylonitrile interaction

Padhye, M. R.; Karandikar, A. V.

doi:10.1002/app.1985.070300216

Cited by 12 publications

(14 citation statements)

References 6 publications

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“…In the solution phase, DMF breaks this self‐association by interacting with the nitrile groups through dipole–dipole interactions, resulting in the red shift. Our data (Table 3) did not show the frequency shift between PAN films and solutions, as reported by Padhye and Karandikar 26. However, some qualitative differences in the spectra were observed between the solvent‐free films and PAN–DMF solutions.…”

Section: Resultssupporting

confidence: 77%

“…Padhye and Karandikar26 also observed a new band at 2249 cm −1 in addition to a strong absorption band at 2230 cm −1 for nitrile group, in a DMF‐LiBr‐acrylonitrile system. They attributed this new band at 2249 cm −1 to the strong interaction of LiBr with the C≡N group of acrylonitrile.…”

Section: Resultsmentioning

confidence: 88%

“…Padhye and Karandikar26 performed an IR investigation of PAN films and of PAN solutions in neat DMF and DMF + LiBr. They reported the C≡N stretching frequency to occur at 2250 cm −1 for solvent‐free PAN films, whereas in PAN–DMF solutions, the C≡N stretching was observed at 2230 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

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Poly(acrylonitrile) ultrafiltration membranes. I. Polymer‐salt‐solvent interactions

Phadke

Musale

Kulkarni

et al. 2005

J Polym Sci B Polym Phys

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Fourier transform infrared spectroscopy was used to study the interactions among LiCl, ZnCl2, and AlCl3 with N,N‐dimethylformamide (DMF) and poly(acrylonitrile) (PAN). It was observed that all three salts complex with DMF as well as PAN. The strength of the cation interaction with the >CO oxygen of DMF was found to be higher than that with the CN group of PAN. The >CO stretching frequency of DMF with ZnCl2 was red shifted, indicating stronger complex formation compared with other two cations. With the addition of salt, the salt–DMF pseudo solvent was found to become a θ solvent for PAN compared with neat DMF. This change in PAN solvation power was primarily the result of DMF–salt complexation. As a result of the complexation, Mark‐Houwink constant a, was found to reduce from 0.75 (for pure DMF) to ∼0.6 for DMF–salt solvents, indicating decreased PAN chain expansion. Comparison of intrinsic viscosity [η] values indicated that addition of salts to PAN–DMF solutions resulted in: (i) decrease in the DMF solvation power, which causes less expanded polymer coils, and (ii) increased interpolymer chain entanglements via salt‐promoted chain association. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2061–2073, 2005

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 88%

See 1 more Smart Citation

Poly(acrylonitrile) ultrafiltration membranes. I. Polymer‐salt‐solvent interactions

Phadke

Musale

Kulkarni

et al. 2005

J Polym Sci B Polym Phys

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“…However, in the absence of water, nitrile groups will complex with sodium ion . Considering chemical properties of the nitrile group, this interaction can be attributed to the electron donating nature of the nitrile group …”

Section: Resultsmentioning

confidence: 99%

“…Besides the common solvents such as dimethylformamide (DMF), dimethylacetamide and dimethyl sulfoxide which are usually used as spinning solvents for PAN, ionic liquids (ILs) also have been proved to be effective solvents for PAN homo‐ and copolymers . A clear picture can be visualized from the literature concerning the interactions between acrylic polymers and the common solvents . However, the interactions between acrylic copolymers and IL solvents have not yet been clear.…”

Section: Introductionmentioning

confidence: 99%

Understanding the interactions in acrylic copolymer/1‐butyl‐3‐methylimidazolium chloride from solution rheology

Zhu

Chen

Wang

et al. 2012

Polymers for Advanced Techs

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The effects of the type and content of comonomers on the rheological properties of acrylic copolymers in 1‐butyl‐3‐methylimidazolium chloride ([BMIM]Cl) were explored. According to the de Gennes scaling law for solution, comparison of intrinsic viscosity and scaling analysis of the exponent in the specific viscosity‐ and relaxation time‐concentration power law indicated that solution of both polyacrylonitrile (PAN) homo‐polymer and copolymer poly(acrylonitrile‐co‐methyl acrylate) (poly(AN‐co‐MA)) in [BMIM]Cl behave in the same manner as neutral polymer in a θ‐solvent. However, [BMIM]Cl acts as a more good solvent for poly(acrylonitrile‐co‐acrylamide) (poly(AN‐co‐AM)). The dissolution and unique rheological behavior of such solutions have been attributed to the interactions between copolymer chains and [BMIM]Cl. The interactions between nitrile group (−C≡N) and 1‐butyl‐3‐methylimidazolium cation ([BMIM]+) should interrupt and break the dipolar‐dipolar interactions of PAN resulting in the subsequent dissolution of the polymer in [BMIM]Cl. Such interactions between −C≡N and [BMIM]+ ion are still dominated by the solvating ability of poly(AN‐co‐MA) in [BMIM]Cl, even though carbonyl group (C=O) in MA repeating unit could coordinate to cation of the ionic liquid. The salvation capacity of [BMIM]Cl for poly(AN‐co‐AM) can be evidently improved due to the extra hydrogen bond interactions between −NH2 group of AM and anion of [BMIM]Cl. Copyright © 2012 John Wiley & Sons, Ltd.

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Interaction between polyacrylonitrile and alkalis

Hou

Wang

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:Interactions between highly isotactic acrylonitrile homopolymers and alkalis in dimethyl sulfoxide solvent were examined. Coloration occurred as soon as polyacrylonitrile was added to a dimethyl sulfoxide/alkali mixture. The effects of alkali on highly isotactic polyacrylonitrile were greater than those on ordinary polyacrylonitrile. The intrinsic viscosity of polyacrylonitrile decreased quickly with the addition of sodium ethoxide and sodium hydroxide, and the effect of sodium ethoxide was more prominent than that of sodium hydroxide. As the concentration of sodium ethoxide and sodium hydroxide went beyond 0.01 mol/L, the intrinsic viscosity showed a trend of increasing. Within the first half-hour, there was a great drop in the intrinsic viscosity of highly isotactic polyacrylonitrile, and then the intrinsic viscosity appeared to increase. The intrinsic viscosity of highly isotactic polyacrylonitrile increased continuously with the addition of diethylamine along with time. The effects of alkalis on the tacticity of the polymers followed the order of the alkali strength. Diethylamine was more effective for moderating the stabilization exotherm of polyacrylonitrile than sodium ethoxide and sodium hydroxide.

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The effect of alkali salt on solvent–polyacrylonitrile interaction

Cited by 12 publications

References 6 publications

Poly(acrylonitrile) ultrafiltration membranes. I. Polymer‐salt‐solvent interactions

Poly(acrylonitrile) ultrafiltration membranes. I. Polymer‐salt‐solvent interactions

Understanding the interactions in acrylic copolymer/1‐butyl‐3‐methylimidazolium chloride from solution rheology

Interaction between polyacrylonitrile and alkalis

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