Rheological Behaviors of Graphene Oxide/Polyacrylonitrile Spinning Solutions

Li, Feng Mei; Zheng, Ying; Wang, Biao

doi:10.4028/www.scientific.net/msf.898.2187

Cited by 4 publications

(11 citation statements)

References 24 publications

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“…That was because CN bonds could be transformed into CN bonds conjugated with CC bonds during oxidative stabilization, which formed the frame of crosslinking structure in the stabilized films. The peaks centered at 2940, 1380, and 1470 cm −1 corresponded to CH bonds . The intensities of these peaks were decreased after GO addition, because the hydrogen was wiped off as H 2 O during the dehydrogenation and oxidation reactions.…”

Section: Resultsmentioning

confidence: 99%

“…The electronegativity groups such as carboxylic groups on GO sheets could initiate the nucleophilic attack to nitrile group of PAN macromolecules during heat treatment . Thus, GO could take part in the cyclization reaction of PAN macromolecules . The second was the in situ oxygen diffusion effect.…”

Section: Resultsmentioning

confidence: 99%

“…The three samples had the similar variation trend. However, the shrinkage decreased with the increase of GO content before 280 °C, which was attributed to the constrained movement of PAN molecular chains by GO sheets at low temperature . In addition, the aforementioned initiation effect and in situ oxygen diffusion effect of GO during the heat treatment were also factors.…”

Section: Resultsmentioning

confidence: 99%

“…The viscosity average molecule weight was 4.8 × 10 4 g mol −1 . GO was prepared from purified natural graphite (Bay Carbon, SP‐1) by a modified Hummers method . Dimethyl sulfoxide (DMSO) was of analytical grade and purchased from Sinopharm Chemical Reagent (Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

“…As a graphene derivative, two‐dimensional graphene oxide (GO) contains abundant oxygen‐containing functional groups such as hydroxyl, carbonyl, carboxylic, and epoxy groups, which makes GO suitable for PAN modification . Recent studies showed that PAN can get great improvement in thermal stability, electrochemical, and mechanical properties after incorporation of GO nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

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Structure evolution mechanism of polyacrylonitrile films incorporated with graphene oxide during oxidative stabilization

Chen

et al. 2019

J of Applied Polymer Sci

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Oxidative stabilization is a key process for polyacrylonitrile (PAN)-based carbon materials. During this process, oxygen has a significant influence on the formation of cyclization structure and crosslinking structure of PAN matrix. Here, graphene oxide (GO) was used as filler in PAN matrix, the structure evolution of GO/PAN composite was studied during oxidative stabilization. Solubility measurement revealed that the crosslinking degree increased, while the cyclization degree of stabilized films decreased after GO incorporation. The effect of GO on the structure of PAN film was characterized by XRD, DSC, DMA, FTIR, and XPS. These results verified that GO could initiate the cyclization reaction of PAN at a lower temperature. The carboxylic groups on GO sheets might take part in the cyclization reactions during the heat treatment. Moreover, the oxygen-containing molecules released from GO decomposition during the heat treatment were beneficial to the formation of crosslinking structure. The possible mechanism of the structure evaluation was proposed in this article.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure evolution mechanism of polyacrylonitrile films incorporated with graphene oxide during oxidative stabilization

Chen

et al. 2019

J of Applied Polymer Sci

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Rheological behavior of PES/PVP/DMAc solution and PVP structural regulation for hollow fiber membrane

Zhang

Jiang

et al. 2022

J of Applied Polymer Sci

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Rheological study plays a significant role in hollow fiber membrane spinning process and membrane structure regulation. In this work, the rheological behaviors of polyethersulfone (PES) spinning solutions added the polyvinylpyrrolidone (grade of PVP‐K30, PVP‐K60, and PVP‐K90) were systematically investigated by rotational rheometry to understand how the PES membrane structure changes. Results show that PVP of variable molecular weights change the rheological properties of PES spinning solution, such as the viscosity (ηa), non‐Newtonian index (n), flow activation energy (Eη), structural viscosity index (∆η), storage modulus (G′), and loss modulus (G′′). The mixture with PVP‐K30 exhibits optimal spinnability but the finger‐like membrane structure is undesirable for the hemodialysis. The rheological behaviors of PES/PVP‐K60 and PES/PVP‐K90 reveal that increasing shear rate and temperature are effective ways to improve the spinnability of the mixture and the membrane structure is regulated. Meanwhile, the addition of PVP‐K60 or PVP‐K90 at their critical concentration to the PES solution can fabricate a hollow membrane with a sponge‐like structure. Combining spinnability and membrane structure, PVP‐K90 is a suitable additive for the hemodialysis membrane.

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Hydrogen bond producers in powerful protic ionic liquids for enhancing dissolution of natural cellulose

Chen,

Zhao,

Zhu

et al. 2024

SusMat

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The manipulation of hydrogen bonding within protic ionic liquids is conducive to conquering the robust hydrogen bonding interactions in cellulose for its effective dissolution, but it is a great challenge to establish the delicate balance of hydrogen bonding network between solvent and cellulose. Herein, we proposed the concept of “hydrogen bond producers” for urea molecules in 1,1,3,3‐tetramethylguanidinium methoxyacetate acid ([TMGH][MAA]) to enhance the dissolution of cellulose. The optimization of physicochemical properties for [TMGH][MAA] solvent as a function of urea concentration revealed a remarkable increase in cellulose solubility from 13% to 17% (w/w) by adding only 0.25 wt% urea, highlighting the efficiency of [TMGH][MAA] as a powerful solvent for the dissolution of cellulose. The experimental and simulation results verified that the significant improvement on dissolution of cellulose was attributed to the hydrogen bonding interaction of urea molecules with ion pairs and part of free ions, reducing the interference with the active ions bonded to cellulose. Furthermore, the considerable enhancement on comprehensive properties of regenerated cellulose films demonstrated the effectiveness of [TMGH][MAA]/urea solvent. The concept of “hydrogen bond producers” presented here opens a new avenue for significantly enhancing the dissolution of natural cellulose, promoting the sustainable development in large‐scale processing of cellulose.

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Rheological Behaviors of Graphene Oxide/Polyacrylonitrile Spinning Solutions

Cited by 4 publications

References 24 publications

Structure evolution mechanism of polyacrylonitrile films incorporated with graphene oxide during oxidative stabilization

Structure evolution mechanism of polyacrylonitrile films incorporated with graphene oxide during oxidative stabilization

Rheological behavior of PES/PVP/DMAc solution and PVP structural regulation for hollow fiber membrane

Hydrogen bond producers in powerful protic ionic liquids for enhancing dissolution of natural cellulose

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