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Journal of Zhejiang University SCIENCE A 2001 Vol.2 No.3 P.265-270

http://doi.org/10.1631/jzus.2001.0265


INFLUENCE OF SOLVENT AND POLYMER SORT ON ANOMALOUS RHEOLOGICAL BEHAVIOR OF POLYMER SOLUTION AT HIGH DILUTION


Author(s):  QIAN Jin-wen, ZHOU Guo-hai, ZHENG Qiang, WU Ping-dong

Affiliation(s):  Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   qianjw@ipsm.zju.edu.cn

Key Words:  polyvinyl acetate (PVAc), polystyrene (PS), ethylene-vinyl acetate (EVA) copolymer, rheology, polymer solution, viscosity


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QIAN Jin-wen, ZHOU Guo-hai, ZHENG Qiang, WU Ping-dong. INFLUENCE OF SOLVENT AND POLYMER SORT ON ANOMALOUS RHEOLOGICAL BEHAVIOR OF POLYMER SOLUTION AT HIGH DILUTION[J]. Journal of Zhejiang University Science A, 2001, 2(3): 265-270.

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author="QIAN Jin-wen, ZHOU Guo-hai, ZHENG Qiang, WU Ping-dong",
journal="Journal of Zhejiang University Science A",
volume="2",
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pages="265-270",
year="2001",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2001.0265"
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%A ZHENG Qiang
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A1 - QIAN Jin-wen
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A1 - WU Ping-dong
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2001.0265


Abstract: 
The rheological behavior of polyvinyl acetate (PVAc) in N,N'-dimethylformamide (DMF), methyl ethyl ketone (MEK), 1,2-dichloroethane (DCE), tetrahydrofuran (THF) and toluene (TOL), polystyrene (PS) in DMF, MEK, DCE, THF and cyclohexane (CYH), and random ethylene-vinyl acetate (EVA) copolymer in DCE, TOL, CYH with and without surfactant of Span80 and in the DCE/CYH solvent mixtures with surfactant of Span80 was examined at high dilution. It was shown that the extent and type of the upsweep or downsweep (anomalous rheological behavior) of the reduced viscosity-concentration curves of these different polymers at high dilution are markedly dependent on the dielectric constant of the solvent and the polarity of the polymer used. The experimental results indicated that the anomalous rheological behavior of EVA copolymer, widely used as a flow improver, is related to its efficiency in reducing viscosity and depressing pour point of crude oil and waxy solvents.

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