Influence of solvent and polymer sort on anomalous rheological behavior of polymer solution at high dilution |
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| Authors: | Qian Jin-wen Zhou Guo-hai Zheng Qiang Wu Ping-dong |
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| Institution: | (1) Department of Polymer Science and Engineering, Zhejiang University, 310027 Hangzhou, China;(2) Department of Chemical Engineering, Zhejiang University, 310027 Hangzhou, China |
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| 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.
Project (No.29774020) suppored by the Natural Science Foundation of China(NSFC). |
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| Keywords: | polyvinyl acetate (PVAc) polystyrene (PS) ethylene-vinyl acetate (EVA) copolymer rheology polymer solution viscosity |
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