Stability of acrylonitrile–acrylamide copolymer solutions

Hou, Chen; Wang, Chengguo; Liang, Ying; Cai, Hua‐Su

doi:10.1002/app.13569

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…9 -11 But, several key physical properties of P(AN-IA) copolymers, such as void volume, fineness, tenacity, and degree of orientation, are still not satisfying because the drawn-ratio of P(AN-IA) fibers can not reach high enough. 11 There are reports 12,13 on ammonium itaconate (AIA) acting as the comonomers, but the effects of AIA on the thermal and physical properties of the final PAN precursor fibers are not discussed.…”

Section: Introductionmentioning

confidence: 99%

Modification of polyacrylonitrile precursors for carbon fiber via copolymerization of acrylonitrile with ammonium itaconate

Liu

Wang

2006

J of Applied Polymer Sci

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Ammonium-modified polyacrylonitrile was prepared by free-radical solution copolymerization of acrylonitrile (AN) with ammonium itaconate (AIA), and then it was spun into precursor fibers in this study. Effects of AIA and itaconic acid on the characteristics of the copolymers and precursor fibers were studied in contrast. It has been found that the ammonium modification could obviously increase the hydrophilicity of the copolymer. And in the spinning processes, modified copolymer can withstand higher total draw-ratio of 12.6 folds, while unmodified copolymer only 8.5 folds. The void volume, fineness, tenacity, and elongation at-break of the ammonium-modified precursors are all improved and enhanced. WAXD test manifested that the modified precursors had higher degree of orientation. DSC test showed that the thermal properties of the modified and unmodified precursor fibers were almost the same.

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Section: Introductionmentioning

confidence: 99%

Modification of polyacrylonitrile precursors for carbon fiber via copolymerization of acrylonitrile with ammonium itaconate

Liu

Wang

2006

J of Applied Polymer Sci

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“…Among various polymerization methods, free-radical solvent-water suspension copolymerization method was used to synthesize high molecular, fewer molecular defects of PAN and AN-based copolymers [9,10]. Some researchers have been using free-radical solvent-water suspension polymerization to synthesis AN-AM copolymers [11], but few people studied electrospinning using the copolymer and heat-treatment of the nanofibers made of it.…”

Section: Introductionmentioning

confidence: 99%

Pre-Oxidation Nanofibers from Acrylonitrile-Acrylamide Copolymers Synthesized by Solvent-Water Polymerization

Sun¹,

Wang²,

Wang³

et al. 2011

AMR

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Solvent-water suspension free-radical polymerization method was used to synthesize acrylonitrile(AN)-acrylamide(AM) copolymers in this paper. The copolymerization was carried out with azobisisobutyronitrile (AIBN) as an initiator and dimethysulfoxide (DMSO)/ water solution as solvents at a constant monomer ratio (AN:AM(wt)=85:15). The ratio(wt) AN:AM=100:0 was also be used for a comparison. The structure and properties of the copolymers was studied by fourier transform infrared (FT-IR), X-ray diffraction (XRD) and thermogravimetry(TG). The nanofibers were obtained by electrospinning AN-AM copolymer solution with N,N-Dimethyl acetamide(DMAc) as a solvent. Then, the fibers were pre-oxidized in relaxation state and in air by using an oven. The structure of pre-oxidized nanofibers was investigated by scanning electron microscopy (SEM) and FT-IR. The results showed that the ratio of dimethysulfoxide (DMSO)/water 50/50(v) was optimum for the copolymer properties and nanofiber spinnability as a carbon nanofiber precursor. The copolymer fibers only needed lower preoxidation temperature and shorter preoxidation time to reach the same degree of cyclization due to the introduction of AM.

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Effect of deaeration processing on the behavior of an acrylonitrile–acrylamide copolymer and carbon fiber precursors

Wang

Jiang

2007

J of Applied Polymer Sci

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The effect of the deaeration process on the behavior of acrylonitrile-acrylamide copolymer solutions was demonstrated experimentally in detail. The corresponding mechanical properties and morphology of the resultant precursors were also been examined. It was found that the viscosity of the copolymer solutions at rest increased continuously with the deaeration time prolonged at every fixed temperature stage, but it considerably increased when the deaeration temperature decreased. The changes in the viscosity of the solutions at 808C were less prominent than those of the solutions at 208C in the beginning stage; beyond 60 min, the changes became remarkable. In concentrated copolymer solutions, the dimethyl sulfoxide composition weight percentage decreased with an increase in the deaeration temperature; the increasing temperature reduced the solvent power continuously at a high deaeration temperature, so more solid-elastic gels were formed in the solutions with an increase in time. At the same degree of vacuum, when the temperature varied from 20 to 808C and, in particular, the deaeration temperature was beyond 608C, the products from the copolymer seemed to have slightly narrower molecular weight distributions. With the deaeration temperature increasing, the tensile strength, elongation at break, and bulk density of the resultant precursors increased, but their fineness and coefficient of variation decreased. The morphology of the precursors was more compact and more round beyond 608C than below 608C.

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Stability of acrylonitrile–acrylamide copolymer solutions

Cited by 5 publications

References 7 publications

Modification of polyacrylonitrile precursors for carbon fiber via copolymerization of acrylonitrile with ammonium itaconate

Modification of polyacrylonitrile precursors for carbon fiber via copolymerization of acrylonitrile with ammonium itaconate

Pre-Oxidation Nanofibers from Acrylonitrile-Acrylamide Copolymers Synthesized by Solvent-Water Polymerization

Effect of deaeration processing on the behavior of an acrylonitrile–acrylamide copolymer and carbon fiber precursors

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