スライムの合成(架橋PVA)

ポリビニルアルコールを架橋して非ニュートン流体を作る

Organic Synthesis Beginner (Middle School) 20 分 ~$5.00

目的

ポリビニルアルコール(PVA)をホウ酸ナトリウムで架橋してスライムを作り、高分子化学と非ニュートン流体の挙動を実証する。

背景

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.

安全上の警告

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

必要なPPE

goggles

材料

  • 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

器具

250 mL beaker Stirring rod Measuring cylinder

手順

1

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

1 分
2

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

1 分
3

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

3 分
4

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

5 分 Wash hands afterward
5

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

5 分
6

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

5 分

予想される結果

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.

後片付け

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

Frequently Asked Questions

What is the objective of スライムの合成(架橋PVA)?
ポリビニルアルコール(PVA)をホウ酸ナトリウムで架橋してスライムを作り、高分子化学と非ニュートン流体の挙動を実証する。
How difficult is スライムの合成(架橋PVA)?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for スライムの合成(架橋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 スライムの合成(架橋PVA)?
The main materials required are: Polyvinyl alcohol (PVA) solution, Sodium borate (borax), Food coloring.
What results should I expect from スライムの合成(架橋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.