Synthetic rubber - class-VIII

The formation of vulcanised rubber-

Vulcanisation of rubber-

Vulcanization is a chemical process for converting natural rubber into a more durable material by adding sulphur or other equivalent curatives. This process creates cross-links between polymer chains.

Vulcanization is a process in which the strength, stability, and elasticity of rubber are increased by subjecting it to heat, in the presence of sulphur. As a result, cross-linking occurs between the chains of rubber molecules and sulphur atoms.

Vulcanisation of Rubber - Natural rubber  becomes soft at high temperature (>$335$ K) and brittle at low temperature (<$283$ K) and shows high water absorption capacity.
The process of  vulcanisation includes heating of raw rubber with sulphur and an appropriate additive at temperature range between $373$ K  to $415$ K. Sulphur foms crosslinks at reactive sites of double bonds and thus, rubber gets stiffened.

Neoprene resembles natural rubber. 

Chloroprene is the monomer of neoprene, a synthetic rubber formed by the free radical polymerisation of choloroprene.

Charles Goodyear invented vulcanization process in $1839$.
Vulcanisation is a process involving heating of rubber with sulphur is called vulcanisation.

Vulcanization is the process of heating rubber with sulphur to improve its mechanical properties, such as tensile strength, elasticity, and resistance to abrasion.

Vulcanised rubber is used in making automobile tyres and foot wear. Heating of rubber with sulphur is called as vulcanisation. It makes the rubber hard and more flexible.

$5$% of sulphar is used in order to extent the stiffness of valcanised rubber.

Vulcanised rubber contains sulphur bridges between polymer chains, and phenol-formaldehyde resins (like Bakelite) are thermosetting polymers with a highly cross-linked structure. Both are examples of cross-linked polymers.

Vulcanization is a chemical process by which the physical properties of natural or synthetic rubber are improved. In its simplest form, vulcanization is brought about by heating rubber with sulfur.

The material used for the vulcanisation of rubber is sulphur.

Synthetic fibres generally maintain their structural integrity and strength better in dry conditions. Moisture can often weaken the intermolecular forces or cause swelling in certain synthetic materials.

Vulcanised rubber is highly elastic, so weakest intermolecular forces present in it.

Nitrile rubber, Buna-N, and GRN are all names for the same copolymer of butadiene and acrylonitrile. This material is known for its excellent resistance to oil, fuel, and other chemicals.

Acetaldehyde is primarily used as an intermediate in the manufacture of a range of chemicals, perfumes, aniline dyes, plastic and synthetic rubber, etc.

Neoprene, Buna-N, and Buna-S are all types of synthetic rubbers. Polyethylene is a plastic (thermoplastic polymer), not a synthetic rubber.