dc.creator | Stoiljković, Dragoslav | |
dc.creator | Jovanović, Slobodan | |
dc.date.accessioned | 2022-04-28T13:42:13Z | |
dc.date.available | 2022-04-28T13:42:13Z | |
dc.date.issued | 2019 | |
dc.identifier.issn | 2322-2212 | |
dc.identifier.uri | http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5088 | |
dc.description.abstract | 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
<V<2Vc
. (Vc
is critical volume). β phase consists of molecular pairs
and bimolecules and it exists when V<Vc
and S>Sc
. (Sc
is critical entropy). γ phase and liquid ethylene consist
of bimolecules and oligomolecules and they exist when S<Sc
. The main goal of this article is to publish how
we developed that model and what were thermodynamical, physical and chemical evidences which confirmed
its validity. Instead of the classical theory of radical polymerization, we applied Kargin and Kabanov theory of
polymerization of organized monomer to interpret high pressure free radical polymerization of ethylene. The
arrangement of monomer molecules in individual supramolecular particles and the supramolecular organization
of whole system have decisive effects on the mechanism and kinetics of polymerization and on the formation
of polymer structure and properties, i.e. molecular mass and its distribution, branching, density, etc. There is
isentropic rule: the same structures and properties are obtained for polyethylene if the entropy of ethylene under
polymerization conditions is the same, regardless the differences in other polymerization conditions, i.e. reactor
type, pressure, temperature and method of initiation. Mathematical models of the effect of ethylene entropy on
polyethylene 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. | sr |
dc.language.iso | en | sr |
dc.publisher | Iran Polymer and Petrochemical Institute | sr |
dc.rights | openAccess | sr |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-sa/4.0/ | |
dc.source | Polyolefins Journal | sr |
dc.subject | Ethylene gas compression | sr |
dc.subject | ethylene supramolecular organization | sr |
dc.subject | ethylene supercritical phase state | sr |
dc.subject | ethylene free radical polymerization | sr |
dc.subject | low density polyethylene | sr |
dc.subject | polyethylene structure | sr |
dc.title | Compression, supramolecular organization and free radical polymerization of ethylene gas | sr |
dc.type | article | sr |
dc.rights.license | BY-NC-SA | sr |
dc.citation.epage | 41 | |
dc.citation.issue | 1 | |
dc.citation.spage | 23 | |
dc.citation.volume | 6 | |
dc.identifier.doi | 10.22063/POJ.2018.2252.1117 | |
dc.identifier.fulltext | http://TechnoRep.tmf.bg.ac.rs/bitstream/id/8295/Compression,_supramolecular_organization_pub_2019.pdf | |
dc.identifier.scopus | 2-s2.0-85063005016 | |
dc.type.version | publishedVersion | sr |