The industrial adhesive cure whenever the small resin molecules will join together in order to form extremely large molecules which are called the polymers. One of the very simple polymers is known as polyethylene. The basic building block of the polymer is known as mer. A radical is a species which has an unpaid electron and is also very reactive since it will seek the source of the electrons. The radical will merge the ethylene mer in order to start a chain reaction which continues until there are very large polymer molecules. This as well as other forms of polymerization processes are considered the basis during the formulation of polymers. This particular process is known as curing when it comes to adhesives.
There are criteria which should be met so that the molecule will possess a permanent net dipole moment. The first criterion is an unequal sharing of the elections that are within the molecule such that the intramolecular bonds have a positive end as well as a partial negative end. The second criterion is that there should be geometry such that the sum of the vector of the individual dipole moments will not equal zero.
Electronegativity refers to the ability of an atom that is found within a molecule in order to attract electrons. This is a concept which is proposed by Linus Pauling. He established a table of electronegativities. In the table created by Pauling, fluorine is the element with the most electronegative element which is given the value of 4.0. The main difference in the electronegativity between the two atoms in the molecule, the larger will be the dipole moment in the bond. Since the bond between the two atoms have unequal electronegativities which has a partial negative as well as partial positive end, it is referred as the polar bond. If ever the geometry of the molecule is such that the vector sum does not equal to zero, the molecule is deemed to be polar. The electronegativities for oxygen and carbon are 3.5 and 2.5 respectively which follows that the carbon-oxygen bond is called a polar bond. A carbon dioxide is composed of two carbon-oxygen bond. Its geometry on the other hand is such that the vector sum of the dipole moments will equal to zero.