ENB331 Lecture Notes - Addition Reaction, Oligomer, Epoxy
Document Summary
Polymers are a high molecular weight molecules consisting of repeating subunits which are bound to each other. It is a substance which is built of such molecules in which one or more kinds of atoms or groups of atoms are repeatedly linked together. Less repeating subunits and lower mw than a polymer. Ionic bonds result from the electrostatic attraction of +ve and ve ions. Atoms are held together by sharing of electrons. This type of bonding typically occurs between atoms of non-metals. Covalent bonds are indicated by a line in a structural formulae. Each monomer has at least two functional groups and can, at any instant, form links with chains or other monomers. This process leads to the simultaneous growth of many short chains. Long chains only achieved when all the monomer is consumed. Two different monomers (a-a and b-b) or one monomer with two different end groups (a-b) condense with loss of small molecule (water).
