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A polytetrafluoroethylene capillary viscometer

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Abstract.

A polytetrafluoroethylene(PTFE) capillary Ubbelohde viscometer was designed and constructed. The relative viscosities of aqueous solutions of a polyethylene oxide and a polyvinylpyrrolidone sample were carefully determined down to an extremely dilute concentration region. In comparison with the data obtained from the common glass capillary viscometer, slippage is believed to occur in the PTFE capillary due to its hydrophobic nature. While for the glass capillary viscometer, conventional viscous flow is operative and adsorption phenomena occur since both the solvent water and aqueous solution are wet and/or adsorbed onto the glass capillary surface due to the existence of hydroxyl groups on glass surface. The data were analyzed with a recently developed wall-effect theory and satisfactory results were obtained.

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Acknowledgements.

The authors thank the National Key Projects for Fundamental Research, "Macromolecular Condensed State", the State Science and Technology Commission of China, and the Natural Science Foundation of GuangDong Province of China, the State Key Laboratory of Polymer Physics and Chemistry of China, the National Natural Scientific Funds, and Specialized Research Fund for the Doctoral Program of Higher Education of China (2000028404) for funding .

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  1. Rongshi Cheng

    Present address: College of Material Science and Engineering, South China University of Technology, 510641, Guangzhou, P.R. China

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Nanjing University, 210093, Nanjing, P.R.China

    Jiali Cai & Rongshi Cheng

  2. State key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, 130022, Changchun, P.R. China

    Shuqin Bo

Authors
  1. Jiali Cai
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  2. Shuqin Bo
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  3. Rongshi Cheng
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Correspondence to Rongshi Cheng.

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Cai, J., Bo, S. & Cheng, R. A polytetrafluoroethylene capillary viscometer. Colloid Polym Sci 282, 182–187 (2003). https://doi.org/10.1007/s00396-003-0904-3

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  • DOI: https://doi.org/10.1007/s00396-003-0904-3

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