Tổng Hợp Slime (PVA Khâu Mạch)
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Tạo chất lỏng phi Newton bằng cách khâu mạch polyvinyl ancol
Mục tiêu
Tạo slime bằng cách khâu mạch polyvinyl ancol (PVA) với natri borat, minh họa hóa học polyme và tính chất chất lỏng phi Newton.
Bối cảnh
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.
Cảnh báo an toàn
- Borax is an irritant — avoid eye contact
- Wash hands after handling slime
- Do not eat the slime
PPE cần thiết
Vật liệu
-
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
Thiết bị
Quy trình
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.
Kết quả dự kiến
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.
Dọn dẹp
Slime can be disposed of in the trash. Wash hands with soap and water. Rinse beaker with warm water.
Chi tiết
- Danh mục
- Organic Synthesis
- Độ khó
- Beginner (Middle School)
- Thời gian
- 20 phút
- Chi phí ước tính
- $5,00
- Số bước
- 6
- Vật liệu
- 3