what is hydrogen bonds in hair
Side Bonds of the Cortex. The middle layer of the hair, the cortex, is made up of millions of polypeptide chains cross-linked with each other by three different types of side bonds. The bonds that link up the polypeptide chains of the hair are hydrogen, salt and disulfide bonds.Hydrogen bonds account for one-third of the hair's strength. The hydrogen bond is a weak physical side bond that is easily broken by water or heat.Hydrogen bonds can be reformed by drying or cooling the hair. These bonds are very abundant in the hair. Salt bonds are also weak physical side bonds that can easily broken by weak alkaline or acid solutions and changes in pH.here are various elements found in the hair and they are used to make amino acids, keratin, melanin, and protein. The average compostion of normal hair is composed of 45.2 % carbon, 27.9% oxygen, 6.6% hydrogen, 15.1% nitrogen and 5.2a% sulphur. The keratin found in hair is called hard keratin.