Why are rubber called elastomers?
They change their shape on applying force and regain their original shape on removal of the applied force. Hence, rubbers are called elastomers.
Can enzyme be called a polymer?
Yes, these are made up of proteins which are polymers of amino acids.
Can nucleic acid, protein and starch be considered as step growth polymers?
Yes, nucleic acid, protein and starch can be considered as step growth polymers as during their polymerisation reaction, they lead to removal of water molecule or any neutral molecule also. Thus, these are the examples of condensation polymers or step growth polymerisation.
How is the following resin intermediate prepared and which polymers is formed by this monomer unit?
Reaction between melamine and formaldehyde can be shown as
Melamine-formaldehyde polymer is formed by this monomer unit.
To have practical applications why are cross links quetioined in rubber?
Cross links in rubber required for increasing the elasticity of rubber.