Compression, supramolecular organization and free radical polymerization of ethylene gas

At low pressure, ethylene gas consists of single translating and rotating molecules and behaves as an ideal gas. With decrease of free volume by compression, various rotating supramolecular particles are formed, which require less space for the movement: molecular pairs, bimolecules and oligomolecules. The appearance of a new kind of particles is manifested as a phase transition of the second or third order. An ideal gas consists of single translating and rotating molecules. α phase consists of rotating single molecules and rotating molecular pairs and it exists when the volume V is reduced to Vc Sc. (Sc is critical entropy). γ phase and liquid ethylene consist of bimolecules and oligomolecules and they exist when Spolyethylene structure and density enable practical design of polyethylene with desired characteristics. Finally, it is mentioned that we expanded the model of ethylene to other gases and liquids as well as to other polymerization cases, including liquid monomers and olefins polymerization by Ziegler-Natta, metallocene and Phillips catalysts.

کلیدواژه ها:

Ethylene gas compression ، ethylene supramolecular organization ، ethylene supercritical phase state ، ethylene free radical polymerization ، low density polyethylene ، polyethylene structure