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Citation: CAI Jia-Li, BO Shu-Qin, QIN Wen, YAN Xiao-Hu, CHENG Rong-Shi. A Ubbelodhe Viscometer with Polytetrafluoroethylene Capillary[J]. Chinese Journal of Applied Chemistry, ;2001, 18(5): 377-379. shu

A Ubbelodhe Viscometer with Polytetrafluoroethylene Capillary

1.
a College of Chemistry and Chemical Engineering, Nanjing University, Nanjing;
2.
b Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
3.
c Institute of Polymer Science, South China University of Science and Technology, Guangzhou

Received Date: 8 February 2001
Available Online: 30 March 2001
Fund Project: 国家攀登计划"高分子凝聚态基本物理问题"(97056118) (97056118)

A modified Ubbelodhe viscometer with polytetrafluoroethylene capillary has been fabricated. The newly constructed viscometer was tested and compared with conventional glass viscometer by measuring the aqueous solution viscosity of a partially hydrolyzed polyacrylamide sample covering a considerable wide concentration range down to extremely dilute region. The interference from polymer adsorption onto the capillary inner wall surface on the viscosity measurements is completely avoided when the new modified viscosimeter is used instead of common glass viscometer. The experimental results indicate that the so called "polyelectrolyte effect" of solution viscosity is just only an apparent phenomenon due to polymer adsorption.
- modified Ubbelodhe viscometer,
- PTFE capillary,
- polymer solution,
- polyelectrolyte viscosity effect
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