Question

Rubber band on stretching breaks down. Why?

Answer 1

Answer:

rubber band has a property of stretching , if the force is more than stretching nature it is developed a permanent stress damage , applying more force cause tear the rubber band

Answer 2

Explanation:

When molecules form crystals they give off heat hence the reason the rubber band gets hot when stretched. When you let go of the rubber band the polymer molecules break out of the crystals. Whenever molecules break out of crystals they absorb heat hence the reason the rubber band now goes cold.

Cross-linking

There is something else that makes rubber stretchy and that is called cross-linking. Most rubber objects are made of some kind of cross-linked rubber. Cross-linking is a way of chemically joining all the polymer chains of a piece of rubber into one giant molecule. Take a look at the picture below and you can see the difference between a polymer that is cross-linked and one that isn’t.