スライムの合成(架橋PVA)
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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
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
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
手順
Pour 50 mL of PVA solution (or white school glue) into the beaker.
Add 2-3 drops of food coloring if desired and stir.
Slowly add the borax solution to the PVA while stirring continuously.
Continue stirring as the mixture thickens into slime. Knead with hands once it forms.
Test the non-Newtonian properties: roll into a ball, let it flow slowly, pull sharply to see it snap.
Experiment with the ratio of borax to PVA to change slime consistency.
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.
詳細
- カテゴリ
- Organic Synthesis
- 難易度
- Beginner (Middle School)
- 所要時間
- 20 分
- 推定費用
- $5.00
- ステップ数
- 6
- 材料
- 3