Rheological behavior of poly(acrylonitrile) concentrated solutions: effect of Sb2O3 nanoparticles on shear and extensional flow

Akhlaghi, Omid; Menceloǵlu, Yusuf́ Z.; Akbulut, Özge

doi:10.1007/s00396-016-3907-6

Cited by 9 publications

(4 citation statements)

References 44 publications

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“…Moreover, the CNTs, a rigid one-dimension material, is easily oriented at higher shear rate, which facilitate disentanglement of PAN macromolecular chains. So, the amino-CNT/PAN concentrated solutions show earlier shear thinning behavior as compared to the control PAN concentrated solutions [29,37]. These behaviors are in agreement with the previous reports that the polymer filled with CNTs have similar shear thinning at relatively low shear rates [38].…”

Section: Resultssupporting

confidence: 89%

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

et al. 2018

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Abstract:The rheological behavior of amino-functionalized multi-walled carbon nanotubes (amino-CNTs)/polyacrylonitrile (PAN) concentrated solutions in the dimethyl sulphoxide solvent and the effects of the amino-CNTs on the PAN precursor fibers by wet-spinning method were investigated. The amino-CNT/PAN concentrated solutions prepared by in situ solution polymerization with homogeneous dispersion of amino-CNTs have higher complex viscosity, storage modulus and loss modulus as compared to the control PAN concentrated solutions containing 22% PAN polymer by mass. The composite fibers with amino-CNTs of 1 wt % have lower degree of crystallization, crystal size and crystal region orientation compared to the control PAN precursor fibers. However, the amino-CNT/PAN composite fibers with diameter of about 10.5 µm exhibit higher mechanical properties than the control PAN precursor fibers with diameter of about 8.0 µm. Differential scanning calorimetry analysis demonstrated that the cyclization reaction in composite fibers have broad exothermic temperature range and low exothermic rate. These results indicate that the addition of amino-CNTs into PAN precursor fibers is beneficial to controlling the process of thermal stabilization and obtaining the higher performance of composite fibers.

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Section: Resultssupporting

confidence: 89%

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

et al. 2018

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“… a The bending force coefficient of the solution is difficult to measure; instead, we applied the bending force coefficient from our previous work (ref ( 15 )). b Cited from ref ( 23 ). c Quoted from ref ( 24 ) which reported the friction coefficient of a PAN mat as an approximation owing to a rare report of a single PAN fiber.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

Formation Mechanism of Fibrous Web in the Solution Blowing Process

et al. 2022

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Solution blowing (SB) is a widely reported technology that can be used to fabricate fibers at the micro- and nanoscale. To reveal the fibrous web formation mechanism in SB, we improved our previous melt blowing (MB) model to predict fibrous web structures. Then, we fabricated two samples and simulated the same number of virtual samples in the computer to verify the model. Thereafter, we measured the structural parameters including the fiber diameter, fiber orientation, basis weight, and pore size. Our model provides a good prediction of the fiber orientation and basis weight. However, the predicted fiber diameter was slightly smaller than the measured diameter. The experimental pore size distribution was also different from that in the simulated results. The model provides a virtual fabrication process to reveal a fibrous web formation mechanism and finds a similar distribution of these structural parameters between SB and MB.

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“…It shows that finally the nanofillers networks were formed after the addition of a certain amount of MWCNTs to conduct electricity. [ 84,85 ] The decrease in NBR domain size with the increase in MWCNTs content (not shown here) was in favor of the formation of efficient networks, however, the migration of a fraction of MWCNTs nanoparticles into the dispersed phase was against the development of the network to conduct electricity and therefore postponed the creation of the electrical path to higher nanofillers content.…”

Section: Resultsmentioning

confidence: 81%

Effect of multi‐walled carbon nanotubes on rheological behavior and electrical conductivity of poly(ethylene‐co‐vinyl acetate)/acrylonitrile‐butadiene rubber/multi‐walled carbon nanotubes nanocomposites

Razavi‐Nouri

Salavati

2022

Polymer Composites

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In this work, the effect of multi‐walled carbon nanotubes (MWCNTs) on electrical conductivity and rheological behavior of poly(ethylene‐co‐vinyl acetate) (EVA)/acrylonitrile‐butadiene rubber (NBR) blends containing 0 to 7 wt% MWCNTs are investigated. The theoretical calculations according to the interfacial free energy of the components revealed that the nanofillers had a tendency to locate in NBR domains. However, the rheological, electrical, and morphological studies indicated that the majority of the MWCNTs remained in the EVA phase. Shear creep measurements of the molten materials showed that the creep stability improved steadily with the increase in MWCNTs content. The creep behaviors of the materials, except EVA, were analogous to the Burgers model prediction and all four parameters of the model increased in value with the increase in the nanofillers content in comparison with those of the unfilled blend. The rheological studies indicated that the damping factor (tanδ) for the materials containing small amounts of the nanofillers reached a maximum and subsequently decreased with rising temperature. However, for the materials having 1 wt% MWCNTs and higher, the tanδ values were smaller at the highest temperature (200°C) than those of the lowest temperature (100°C) investigated in this work. The electrical percolation threshold was also found to take place at about 2.80 wt% MWCNTs loading.

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Rheological behavior of poly(acrylonitrile) concentrated solutions: effect of Sb2O3 nanoparticles on shear and extensional flow

Cited by 9 publications

References 44 publications

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

Formation Mechanism of Fibrous Web in the Solution Blowing Process

Effect of multi‐walled carbon nanotubes on rheological behavior and electrical conductivity of poly(ethylene‐co‐vinyl acetate)/acrylonitrile‐butadiene rubber/multi‐walled carbon nanotubes nanocomposites

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