Effect of Influencing Factor of PAN Chain Entanglement on Rheological Behavior of PAN/DMSO Solution

doi:10.19491/j.issn.1001-9278.2020.04.001

Abstract

Abstract:

The rheological behaviors of polyacrylonitrile (PAN)/dimethyl sulfoxide (DMSO) solutions were measured with a rotary rheometer, and the relationships of apparent viscosity (η_α), storage modulus, loss modulus and loss tangent angle with the temperature, concentration and shearing conditions were investigated. The effect of PAN chain entanglement on the rheological behavior and molecular structure of PAN/DMSO solution were studied. The results indicated that pre?shear could effectively make the PAN chains disentangle to some extent and therefore resulted in a decrease of the η_α of PAN/DMSO solution. Moreover, the effect of shear on the η_α was reduced with increasing the temperature and decreasing the concentration. As a result, the rheological performance of PAN/DMSO solution was improved.

Key words: polyacrylonitrile, rheology, chain entanglement

CLC Number:

TQ 325.1

Yang XING, Chong WANG, Zhongyu FU, Shiyu LIU, Huixuan ZHANG. Effect of Influencing Factor of PAN Chain Entanglement on Rheological Behavior of PAN/DMSO Solution[J]. China Plastics, 2020, 34(4): 1-5.

Figures/Tables 6

Fig.2. Relationship between ηα and γ˙of PAN/DMSO solution with 20 % concentration at different temperatures after 4 cycles of shearing

Fig.3. Relationship between ηα and γ˙at different concentrations of PAN/DMSO solution at 55 °C after 4 cycles of shearing

Fig.4. LogG'?logG '' curves of different PAN/DMSO solution at different temperatures and the relationship between the slope of the curve and temperature

Fig.5. Relationship between storage modulus G' and shear frequency ω of 20 % PAN/DMSO solution with and without steady?state shearing at different temperatures

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