What are polymeric backbone in silicone and phoazenes?

Polymeric backbones in silicones and phthalonitriles are fundamental components that define their structural and functional properties. In silicones, the backbone consists of alternating silicon and oxygen atoms (Si-O), which confer flexibility and thermal stability. In contrast, phthalonitriles feature a backbone formed by aromatic rings linked by nitrile groups (–C≡N), providing rigidity and high thermal resistance. These distinct backbones influence the physical properties and applications of each polymer type.