Covalent bonds are the strongest chemical bonds and are formed by sharing electrons between atoms. In polymers, covalent bonds are the main type of bond that holds the individual monomers together to form the polymer chain.
Hydrogen bonds are weaker chemical bonds that are formed between electronegative atoms and hydrogen atoms. In polymers, hydrogen bonds can occur between the electronegative atoms (usually oxygen or nitrogen) and the hydrogen atoms of the neighboring monomer units. Hydrogen bonds help to stabilize the polymer chain by forming additional bonds between the monomers and can also affect the physical properties of the polymer.
