Yes, nylon 66 contains hydrogen bonds. Nylon 66 is a polyamide, which means it is a polymer made up of repeating units linked by amide bonds. Amide bonds are formed by the reaction of a carboxylic acid and an amine, and they contain a hydrogen atom that is bonded to a nitrogen atom and an oxygen atom. These hydrogen atoms can form hydrogen bonds with other electronegative atoms, such as nitrogen and oxygen atoms, which are also present in the nylon 66 polymer chains. The presence of hydrogen bonds between the polymer chains helps to hold the chains together and give nylon 66 its strength and rigidity.