On the universal behavior of some organic compounds under compression

Abstract
Such materials as polyethylene, polypropylene, polyisobutylene have about the same initial density and the same elemental composition (CH₂), only the structures of the initial molecules differ. As the conducted analysis shows, the behaviors of polyethylene and polypropylene under compression are similar and described with one and the same equation of state (with the same parameters). The correlation behavior of compressibility of hydrocarbon and fluorocarbon compounds of CF₂ type is shown. This may be because of identical electron configuration of oxygen-like carbon ion in these compounds.