Polymer cross-linking and viscosity

Polymer cross-linking and viscosity - Polymer Cross-Linking...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Polymer Cross-Linking and Viscosity by Megan Lawless Lab Instructor: Mr. Hoch November 9, 2007
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Results and Discussion: The purpose of this experiment was to devise and perform a procedure that could determine the effect of cross-linking on the viscosity of a polymer solution. Poly(vinyl alcohol) was cross-linked using borate ions. 50 mL of tap water was heated until it began to boil, and then was allowed to cool to 90°. 2.011 grams of poly(vinyl alcohol) was slowly added to the hot water with stirring. Once all of the PVA was added, the solution appeared to be slightly viscous and had a fairly clear color. 10 drops of 0.1% methyl red indicator was added to the PVA, making the solution faintly yellow. At this point the first measure of viscosity was made (Table 1). The measurement was made by pouring 25 mL of the PVA solution into a graduated cylinder and timing how long it took for a marble to reach the bottom of the cylinder. 3.0 mL of a borate ion solution was added, and a second viscosity measurement was made. The borate ion solution was formed by adding borax to
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern