Question

what is meant
by vulcanized rubber

Answer 1

Vulcanized rubber is a material that undergoes a chemical process known as vulcanization. This process involves mixing natural rubber with additives such as sulfur and other curatives. Vulcanization makes rubber much stronger, more flexible, and more resistant to heat and other environmental conditions. Vulcanized rubber makes both soft and hard objects, ranging from rubber bands to bowling balls. In fact, almost any rubber object consists of vulcanized rubber.

How Vulcanized Rubber is Made
It is necessary to use vulcanization to make commercial-grade rubber because natural rubber is not stable enough to produce goods with. In fact, natural rubber melts when warm, breaks apart when cold, and is very sticky. This is because natural rubber consists of independent polymer chains that allow the rubber to be deformed. Vulcanization creates bridges between these polymer chains, allowing the rubber to be deformed when stress is applied and to return to its original position when the stress is removed.

Answer 2

Heating the rubber in presence of sulphur is called vulcanisation of rubber it helps in increasing the strength of rubber.

In the picture that I have linked with my answer shows that sulphur bonds are formed between rubbers due to heating thus helping in increasing the strength of rubber.

Hope it is useful