Backbone chain
Encyclopedia
In polymer science, the backbone chain or main chain of a polymer
Polymer
A polymer is a large molecule composed of repeating structural units. These subunits are typically connected by covalent chemical bonds...

 is the series of covalently bonded atom
Atom
The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons...

s that together create the continuous chain of the molecule
Molecule
A molecule is an electrically neutral group of at least two atoms held together by covalent chemical bonds. Molecules are distinguished from ions by their electrical charge...

.
The backbone contains an amino group, a carboxylic acid group, and a central carbon. However, the backbone does not contain a R-group.
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