Constant rotational rheological behaviors of the PAN/DMSO/nonsolvent systems

Du, Wenfeng; Chen, Huifang; Xu, Yurun; Pan, Ding

doi:10.1002/app.30568

Cited by 3 publications

(2 citation statements)

References 18 publications

(15 reference statements)

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“…30,31 The apparent viscosity of blending polymer solutions decreases with the increase of temperature at the fixed shear rates, which is due to the increased energy to promote molecule motion with the rising of temperature. 32 Moreover, the viscosity keeps constant with the shear rate increase when the temperature is reach up to 60 C, exhibiting the trend close to the Newtonian fluids. The viscosity of PAN/DMSO/Si blending polymer solutions as a function of shear rates at the temperature of 60 C was showed in Figure 1(f).…”

Section: Steady-state Flow Behaviorsmentioning

confidence: 57%

“…The phenomenon can be explained by the orientation and the destruction of entangled networks of the molecules chains of PAN in the direction of flow 30,31 . The apparent viscosity of blending polymer solutions decreases with the increase of temperature at the fixed shear rates, which is due to the increased energy to promote molecule motion with the rising of temperature 32 . Moreover, the viscosity keeps constant with the shear rate increase when the temperature is reach up to 60°C, exhibiting the trend close to the Newtonian fluids.…”

Section: Resultsmentioning

confidence: 99%

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Influence of surfactants on rheological behaviors of polyacrylonitrile/dimethyl sulfoxide/silicon blending polymer solutions

Yuan

Guo

Ren

et al. 2021

J of Applied Polymer Sci

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KH550, KH560, CTAB, and F127 were adopted to modify silicon (Si) to improve the dispersity and stability of Si in the polyacrylonitrile/dimethyl sulfoxide (PAN/DMSO) polymer solutions. The influence of surfactants on rheological behaviors of PAN/DMSO/Si blending polymer solutions was investigated by an advanced solution and melt rotation rheometer. The homogeneity and stability were also studied. The results showed that the surfactants could change the viscosity dependence of blending polymer solutions on shear rate, temperature and storage time by increase the steric hindrance of Si. Among the four solutions, PAN/DMSO/Si blending polymer solution with F127 exhibited the lowest viscosity, activation energy and the smallest structural viscosity index and exhibited the trend close to the Newtonian fluids. Moreover, PAN/DMSO/Si blending polymer solution with F127 exhibited the best dispersity and stability, indicating its best physical properties and machinability.

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Section: Steady-state Flow Behaviorsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Influence of surfactants on rheological behaviors of polyacrylonitrile/dimethyl sulfoxide/silicon blending polymer solutions

Yuan

Guo

Ren

et al. 2021

J of Applied Polymer Sci

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Structure of PAN precursor in thermal‐induced gel spinning

Chen

et al. 2011

J of Applied Polymer Sci

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The thermal-induced gel spinning of polyacrylonitrile/dimethyl sulfoxide/water solutions were performed. The structure and performance of the PAN precursor fibers were characterized by mechanical properties testing, swelling capacity testing, scanning electron microscopy, and X-ray diffraction. The effects of the water content, polymer concentration, coagulation bath temperature, and draw ratio on the cross-sectional morphology, structure, and tensile properties are reported. The results show that 2% water content is optimal due to dispersed small pores found in the fibers' cross section. With the coagulating bath temperature decreased, the large pores in fibers also decreased. Large pores almost disappeared up to À9C. The mechanical properties of the PAN fibers increased with the enhancement of PAN concentration, while the decrease of the coagulating bath temperature or water content would induce the improvement of the fibers' mechanical properties.

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The effect of liquid crystalline graphene oxide compared with non-liquid crystalline graphene oxide on the rheological properties of polyacrylonitrile solution

Liu

2021

High Temperature Materials and Processes

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In this article, polyacrylonitrile (PAN) and two kinds of graphene oxide (GO) with different structural properties are blended in dimethyl sulfoxide (DMSO) according to a certain ratio to prepare stable-spinning solution. One kind of GO is purchased, and we call it GO1. The other is a kind of self-made GO with liquid crystal property in solution, which is called GO2. The effects of two kinds of GO on the rheological properties of PAN/GO spinning solution (15 wt%) were studied. The results show that the viscous activation energy of the liquid crystal GO2/PAN blend solution is significantly higher than that of the nonliquid crystal GO1/PAN blend solution. Moreover, the liquid crystal system is more obviously affected by temperature. The structural viscosity index of the liquid crystalline GO2/PAN solution is obviously lower than that of the GO1/PAN solution. It indicates that the existence of liquid crystallinity is beneficial to the spinning of the solution. In the low-frequency region, the addition of GO1 makes the solution more elastic, and the addition of GO2 makes the solution more viscous.

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Constant rotational rheological behaviors of the PAN/DMSO/nonsolvent systems

Cited by 3 publications

References 18 publications

Influence of surfactants on rheological behaviors of polyacrylonitrile/dimethyl sulfoxide/silicon blending polymer solutions

Influence of surfactants on rheological behaviors of polyacrylonitrile/dimethyl sulfoxide/silicon blending polymer solutions

Structure of PAN precursor in thermal‐induced gel spinning

The effect of liquid crystalline graphene oxide compared with non-liquid crystalline graphene oxide on the rheological properties of polyacrylonitrile solution

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