The aspect of phospholipids that is most important to the formation of bilayers are the amphipathic molecules
Amphipathic molecules are chemical compounds which consist of both polar and nonpolar parts.
The presence of these two parts provides the compound with both hydrophilic (water-loving) and lipophilic (fat-loving) properties.
These two regions are covalently bonded and have different affinity for the solvent in the same molecule.
This means that, one region has great affinity for polar solvents such as water while the other region has great affinity for non polar solvents such as hydrocarbons.
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