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Reokinetičko izučavanje umrežavanja α,ω-dihidroksi oligo(alkilen maleata) triizocijanatima

dc.creatorDunjić, Branko
dc.creatorĐonlagić, Jasna
dc.creatorVukašinović, Slavko
dc.creatorSepulchre, M.O.
dc.creatorSepulchre, M.O.
dc.creatorSpassky, Nicolas
dc.date.accessioned2021-03-10T10:09:44Z
dc.date.available2021-03-10T10:09:44Z
dc.date.issued2003
dc.identifier.issn0352-5139
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/575
dc.description.abstractThe crosslinking reaction of three series of α,ω-dihydroxy oligo(alkylene maleate)s with a trifunctional isocyanate was followed by dynamic mechanical analysis and FTIR spectroscopy. The evaluation of rheological parameters such as storage G’ and loss modulus G", was recorded. A typical G’versus time curve has a characteristic "S" shape, indicating autoacceleration of the crosslinking reaction. The whole curing process starting from G’equal G", or the beginning of gelation is described by a second - order phenomenological rheokinetic equation which takes into account the autoacceleration effect, the latter being a consequence of the superposition of both the chemical reaction and phase segregation. It appears that the crosslinking reaction rate depends on the concentration of the functional groups, i.e., on the molecular weight of the polyester prepolymer and on the length of the aliphatic sequence in the repeating unit or the segmental mobility. The crosslinking rate decreases in the order: poly(octamethylene maleate) gt poly(hexamethylene maleate) gt poly(butylene maleate).en
dc.description.abstractKinetika reakcije umrežavanja je izučavana pomoću dinamičke mehaničke analize i FTIR spektroskopije na tri serije α,ω-dihidroksi-oligo(alkilen-maleata) i trifunkcionalnog izocijanata. Reakcija umrežavanja polimera praćena je preko promene reoloških parametara kao što su modul sačuvane energije G’ i modul izgubljene energije G". Kriva zavisnosti G’ od vremena ima karakterističan "S" oblik, što ukazuje na samoubrzavanje pri reakciji umrežavanja. Ceo proces umrežavanja od početka želiranja, odnosno, od trenutka kada je G’ jednako G", je opisan fenomenološkom reokinetičkom jednačinom drugog reda koja uzima u obzir efekat samoubrzavanja, kao posledicu superpozicije hemijske reakcije i morfoloških promena. Pokazano je da brzina reakcije umrežavanja zavisi kako od koncentracije funkcionalnih grupa, tj. od molarne mase poliestarskog pretpolimera, tako i od dužine alifatične sekvence u osnovnom motivu ili segmentalne pokretljivosti. Brzina reakcije umrežavanja opada u nizu poli(oktametilen–maleat) gt poli(heksametilen–maleat) gt poli(butilen–maleat).sr
dc.publisherSerbian Chemical Society, Belgrade
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceJournal of the Serbian Chemical Society
dc.subjecthydroxyl terminated polymaleatesen
dc.subjectpolyurethaneen
dc.subjectrheokinetic analysisen
dc.titleRheokinetic study of crosslinking of α,ω-dihydroxy oligo(alkylene maleate)s with a trisisocyanateen
dc.titleReokinetičko izučavanje umrežavanja α,ω-dihidroksi oligo(alkilen maleata) triizocijanatimasr
dc.typearticle
dc.rights.licenseBY-NC-ND
dc.citation.epage162
dc.citation.issue3
dc.citation.other68(3): 147-162
dc.citation.rankM23
dc.citation.spage147
dc.citation.volume68
dc.identifier.rcubconv_518
dc.identifier.scopus2-s2.0-0038719636
dc.identifier.wos000181865100001
dc.type.versionpublishedVersion


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