Rheological and thermal properties of acrylonitrile-acrylamide copolymers: Influence of polymerization temperature

Wu, Xiao; Lü, Chunxiang; Wu, Gang-Ping; Zhang, Rui; Ling, Licheng

doi:10.1007/bf02875599

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The polymer molecular chain in the solution is stretched significantly, and it trends to recover the original random-coil conformation, which eventually leads to an additional resistance. The resistance produced by the polymer molecular chain is characterized by extensional viscosity [4] . The Hencky Strain Rate ε was calculated from the equation as follows: ε=2ln…”

Section: Resultsmentioning

confidence: 99%

Study on Spinnability of UHMW/PAN Dope in DMSO

Chen

2014

MSF

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The extensional rheological properties of the PAN/DMSO spinning solution using ultrahigh molecular weight (UHMW) PAN as additive were studied. The effects of the additive content on the extensional rheological curve, the extensional viscosity, as well as the spinnability of the PAN/DMSO spinning solution were investigated. The results revealed that the spinnability was related to such factors as solution concentration, additive content, temperature, apparent extensional viscosity and extensional strain rate. The effect of additive on the spinnability of the spinning solution turned out to be small when additive contents were set at a very low level. The spinnability of the spinning solution was optimized when the additive content was 0.5%wt, while the spinning solution adding 1%wt additive had a good spinnability only at a relatively higher temperature.

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Section: Resultsmentioning

confidence: 99%

Study on Spinnability of UHMW/PAN Dope in DMSO

Chen

2014

MSF

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“…The total monomer content was kept constant at 10g in all the experiments. The flask was placed in a thermostated water bath at 65 o C [15]. The reaction time was 2 hours.…”

Section: Methodsmentioning

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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“…Thus, additives of itaconic acid, acrylic acid, and meth acrylic acid promote a shift of the cyclization reaction onset toward lower temperatures than that for the AN homopolymer [2][3][4][5], while the presence of methy lacrylate units in the chain has the opposite effect [6,7]. If acrylamide is used as a comonomer, the temper ature range of the cyclization reaction is determined by its content, i.e., the copolymer composition [8,9]. Note that authors of papers describing the effect of the type of comonomer on the physicochemical and physicomechanical properties of PAN used samples extracted at limiting conversions.…”

Section: Introductionmentioning

confidence: 98%

“…Comonomers incorpo rated into the polymer chain destroy its regularity; change the degree of crystallinity of PAN, the rheolog CN ical characteristics of its solutions, and the tensile strength of fibers; promote widening and shifting of the temperature range of PAN cyclization and oxida tion; etc. The magnitude of these changes is deter mined by not only the chemical nature of a comono mer but also its content in the chain [2][3][4][5][6][7][8][9][10]. Thus, additives of itaconic acid, acrylic acid, and meth acrylic acid promote a shift of the cyclization reaction onset toward lower temperatures than that for the AN homopolymer [2][3][4][5], while the presence of methy lacrylate units in the chain has the opposite effect [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Specific features of the copolymerization of acrylonitrile and acrylamide in the presence of low-molecular-mass and polymeric trithiocarbonates and properties of the obtained copolymers

et al. 2014

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Regularities of the formation of acrylonitrile-acrylamide copolymers obtained from initial mono mer feeds containing 1-50 wt % acrylamide in DMSO solutions with the participation of low molecular mass and polymeric trithiocarbonates as reversible addition fragmentation chain transfer agents are studied for the first time. It is shown that the copolymerization in the presence of low molecular mass trithiocarbonates pro ceeds via a pseudo living mechanism. The synthesized copolymers prove to be inefficient as reversible addi tion fragmentation chain transfer agents, a result that leads to products with bimodal molecular mass distri butions. The rheological characteristics of solutions, as well as the thermal behavior of the copolymers obtained in the absence and in the presence of reversible addition fragmentation chain transfer agents, are studied. The effect of the synthesis conditions on the properties of the synthesized copolymers is discussed.

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Rheological and thermal properties of acrylonitrile-acrylamide copolymers: Influence of polymerization temperature

Cited by 9 publications

References 16 publications

Study on Spinnability of UHMW/PAN Dope in DMSO

Study on Spinnability of UHMW/PAN Dope in DMSO

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

Specific features of the copolymerization of acrylonitrile and acrylamide in the presence of low-molecular-mass and polymeric trithiocarbonates and properties of the obtained copolymers

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