([NH(CH_2) NHCO(CH_2)_4 CO]_ n ) is a:-

$-$\left[\mathrm{NH}(\mathrm{CH})_2 \mathrm{NHCO}\left(\mathrm{CH}_2\right)_4 \mathrm{CO}\right] - is a copolymer because polymer because polymers whose repeating structural units are derived from two or more types of monomer units are called copolymers. Related Theory Thermosetting polymers are the cross-linked polymers and have heavily branched chains. They cannot be reshaped. Thermoplastics have the capability to soften on heating and hard on cooling.