史莱姆合成（交联PVA）

通过交联聚乙烯醇制备非牛顿流体

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

目标

用硼酸钠交联聚乙烯醇（PVA）制备史莱姆，演示高分子化学和非牛顿流体行为。

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.

安全警告

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

所需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

设备

250 mL beaker Stirring rod Measuring cylinder

步骤

1

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

1 分钟
2

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

1 分钟
3

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

3 分钟
4

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

5 分钟 Wash hands afterward
5

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

5 分钟
6

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

5 分钟

预期结果

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.

清理

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

详情

类别
Organic Synthesis
难度
Beginner (Middle School)
时长
20 分钟
预估费用
$5.00
步骤数
6
材料
3

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Frequently Asked Questions

What is the objective of 史莱姆合成（交联PVA）?
用硼酸钠交联聚乙烯醇（PVA）制备史莱姆，演示高分子化学和非牛顿流体行为。
How difficult is 史莱姆合成（交联PVA）?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 史莱姆合成（交联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 史莱姆合成（交联PVA）?
The main materials required are: Polyvinyl alcohol (PVA) solution, Sodium borate (borax), Food coloring.
What results should I expect from 史莱姆合成（交联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.