Schleimsynthese (vernetztes PVA)

Herstellung einer nicht-newtonschen Flüssigkeit durch Vernetzung von Polyvinylalkohol

Organic Synthesis Beginner (Middle School) 20 Min. ~$5,00

Ziel

Schleim durch Vernetzung von Polyvinylalkohol (PVA) mit Natriumborat herstellen und dabei Polymerchemie sowie nicht-newtonsche Flüssigkeiten demonstrieren.

Hintergrund

When sodium borate (borax) is added to polyvinyl alcohol, borate ions form cross-links between PVA polymer chains, creating a viscoelastic material known as slime. The product exhibits non-Newtonian behavior: it flows slowly under gravity but breaks when pulled sharply.

Sicherheitswarnungen

  • Borax is an irritant — avoid eye contact
  • Wash hands after handling slime
  • Do not eat the slime

Erforderliche PSA

goggles

Materialien

  • Polyvinyl alcohol (PVA) solution (50 mL)
    4% solution or white school glue
  • Sodium borate (borax) (5 g)
    Dissolved in 50 mL water
  • Food coloring (2-3 drops)
    Optional

Ausrüstung

250 mL beaker Stirring rod Measuring cylinder

Durchführung

1

Pour 50 mL of PVA solution (or white school glue) into the beaker.

1 Min.
2

Add 2-3 drops of food coloring if desired and stir.

1 Min.
3

Slowly add the borax solution to the PVA while stirring continuously.

3 Min.
4

Continue stirring as the mixture thickens into slime. Knead with hands once it forms.

5 Min. Wash hands afterward
5

Test the non-Newtonian properties: roll into a ball, let it flow slowly, pull sharply to see it snap.

5 Min.
6

Experiment with the ratio of borax to PVA to change slime consistency.

5 Min.

Erwartete Ergebnisse

A stretchy, squishy slime that flows slowly under gravity but breaks when pulled quickly. More borax makes stiffer slime; less makes it more fluid. The cross-linking is reversible — slime will slowly become more liquid over days.

Aufräumen

Slime can be disposed of in the trash. Wash hands with soap and water. Rinse beaker with warm water.

Details

Kategorie
Organic Synthesis
Schwierigkeit
Beginner (Middle School)
Dauer
20 Min.
Geschätzte Kosten
$5,00
Schritte
6
Materialien
3

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Frequently Asked Questions

What is the objective of Schleimsynthese (vernetztes PVA)?
Schleim durch Vernetzung von Polyvinylalkohol (PVA) mit Natriumborat herstellen und dabei Polymerchemie sowie nicht-newtonsche Flüssigkeiten demonstrieren.
How difficult is Schleimsynthese (vernetztes PVA)?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Schleimsynthese (vernetztes PVA)?
Key safety precautions include: Borax is an irritant — avoid eye contact; Wash hands after handling slime; Do not eat the slime.
What materials are needed for Schleimsynthese (vernetztes PVA)?
The main materials required are: Polyvinyl alcohol (PVA) solution, Sodium borate (borax), Food coloring.
What results should I expect from Schleimsynthese (vernetztes PVA)?
A stretchy, squishy slime that flows slowly under gravity but breaks when pulled quickly. More borax makes stiffer slime; less makes it more fluid. The cross-linking is reversible — slime will slowly become more liquid over days.