تخليق المخاط (PVA متشابك))

إنشاء سائل غير نيوتوني بتشابك كحول البولي فينيل

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

الهدف

إنشاء المخاط بتشابك كحول البولي فينيل (PVA) مع بورات الصوديوم، مما يوضح كيمياء البوليمر وسلوك السائل غير النيوتوني.

الخلفية

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.

تحذيرات السلامة

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

معدات الوقاية الشخصية المطلوبة

goggles

المواد

  • 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

المعدات

250 mL beaker Stirring rod Measuring cylinder

الإجراء

1

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

1 دقيقة
2

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

1 دقيقة
3

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

3 دقيقة
4

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

5 دقيقة Wash hands afterward
5

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

5 دقيقة
6

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

5 دقيقة

النتائج المتوقعة

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.

التنظيف

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 تخليق المخاط (PVA متشابك))?
إنشاء المخاط بتشابك كحول البولي فينيل (PVA) مع بورات الصوديوم، مما يوضح كيمياء البوليمر وسلوك السائل غير النيوتوني.
How difficult is تخليق المخاط (PVA متشابك))?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for تخليق المخاط (PVA متشابك))?
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 تخليق المخاط (PVA متشابك))?
The main materials required are: Polyvinyl alcohol (PVA) solution, Sodium borate (borax), Food coloring.
What results should I expect from تخليق المخاط (PVA متشابك))?
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.