Terylene is a/an _____.

The monomer of natural polymer rubber is ______.

The natural rubber has _____.

The following is used for making natural rubber hard:

In vulcanized rubber, the $\text{cis}-1$, $4-\text{polyisoprene}$ chains are attached through _____.

The monomers of Buna-$\mathrm{S}$ rubber are _____.

In Buna-$\mathrm{S}$, $\text{'}\mathrm{S}\text{'}$ stands for _____.

Buna$-\mathrm{N}$ synthetic rubber is a copolymer of _______.

Synthetic rubber is ______.