ERIC Number: EJ1062360
Record Type: Journal
Publication Date: 2015-May
Abstractor: As Provided
Reference Count: 21
The Rheological Properties of Poly(Vinyl Alcohol) Gels from Rotational Viscometry
Hurst, Glenn A.; Bella, Malika; Salzmann, Christoph G.
Journal of Chemical Education, v92 n5 p940-945 May 2015
A laboratory experiment was developed to follow the gelation of a polyvinyl alcohol (PVA) solution upon addition of borax by using rotational viscometry. The rheological properties of the gel were examined, measuring the dependence of viscosity and shear stress on the shear rate. Time-dependent studies were also conducted in which the viscosity of the PVA gel was evaluated as a function of time for different shear rates. A range of qualitative tests were subsequently conducted to demonstrate the phenomena of die swelling, spinability and the Weissenberg effect. Overall, this laboratory experiment has been successfully conducted by over 200 students.
Descriptors: Chemistry, College Science, Science Instruction, Science Experiments, Science Laboratories, Science Activities, Time, Undergraduate Students, Advanced Courses, Laboratory Experiments
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: firstname.lastname@example.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A