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Poli(uretan-siloksani) na bazi hiperrazgranatog poliestra kao umreživača - sinteza i karakterizacija

dc.creatorPergal, Marija
dc.creatorDžunuzović, Jasna
dc.creatorOstojić, Sanja
dc.creatorPergal, Miodrag M.
dc.creatorRadulović, Aleksandra
dc.creatorJovanovic, Slobodan
dc.date.accessioned2019-01-30T17:32:40Z
dc.date.available2019-01-30T17:32:40Z
dc.date.issued2012
dc.identifier.issn0352-5139
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/1108
dc.description.abstractA series of novel polyurethane crosslinked structures (PUs) was prepared from α,ω-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO), 4,4'-methylenediphenyl diisocyanate and Boltorn ® hyperbranched polyester of the third pseudo generation. The hydroxyfunctional hyperbranched aliphatic polyester with 26 end groups was used as a crosslinking agent. In order to improve the compatibility of all the reactants during the synthesis, the PU samples were prepared by two-stage, step-growth polymerization in solution. The content of the soft EO-PDMS-EO segments was varied in the range from 15 to 40 wt. %. The influence of the EO-PDMS-EO content on the swelling behavior, crosslink density, hardness, and the thermal and surface properties of the synthesized PUs was investigated. The structure of the synthesized polyurethanes was confirmed by the presence of specific bands in the Fourier transform infrared spectra. Swelling studies were performed to determine the crosslink density and polyurethane networks with lower EO-PDMS-EO contents had higher crosslink densities. The glass transition temperature of the synthesized PUs, determined by differential scanning calorimetry, slightly increased from 50 to 58°C on decreasing the EO-PDMS-EO content because of the higher crosslink density of the samples. Increasing the EO-PDMS-EO content led to better thermal stability, as was evidenced by the onset temperature of weight loss. The surface of the polyurethane networks became more hydrophobic with increasing EO-PDMS-EO content. The surface morphology of synthesized polyurethanes was analyzed by scanning electron microscopy.en
dc.description.abstractU ovom radu prikazana je sinteza, struktura i neka svojstva novih umreženih poliuretana pripremljenih polazeći od α,ω-dihidroksi-(etilenoksid-poli(dimetilsiloksan)-etilenoksid) pretpolimera (EO-PDMS-EO), 4,4'-metilendifenildiizocijanata i Boltorn® hiperrazgranatog poliestra treće pseudo-generacije. Hiperrazgranati hidroksi funkcionalni alifatski poliestar sa 26 krajnjih grupa služio je kao umrežavajući agens pri sintezi poliuretana. U cilju poboljšanja kompatibilnosti reaktanata tokom sinteze, poliuretani su sintetisani dvostepenom polimerizacijom u rastvoru. Sadržaj mekog EO-PDMS-EO segmenta variran je u opsegu od 15 do 40 mas. %. Ispitan je uticaj EO-PDMS-EO sadržaja na ponašanje pri bubrenju, gustinu umrežavanja, tvrdoću, termička i površinska svojstva sintetisanih poliuretana. Struktura sintetisanih poliuretana potvrđena je FTIR spektroskopijom. Ponašanje pri bubrenju je ispitivano kako bi se odredila gustina umrežavanja i pokazano je da poliuretanske mreže sa nižim EO-PDMS-EO sadržajem imaju veću gustinu umrežavanja. Rezultati diferencijalne skenirajuće kalorimetrije pokazali su povećanje temperature ostakljivanja poliuretana od 50 do 58°C sa smanjenjem EO-PDMS-EO sadržaja kao posledicu veće gustine umreženosti uzoraka. Sintetisani poliuretani sa većim sadržajem EO-PDMS-EO segmenata pokazuju bolju termičku stabilnost, što je potvrđeno porastom početne temperature degradacije, određene TG analizom. Hidrofobnost površine poliuretana je rasla sa povećanjem sadržaja EO-PDMS-EO u odgovarajućem uzorku. Površinska morfologija sintetisanih poliuretana je analizirana skenirajućom elektronskom mikroskopijom.sr
dc.publisherSerbian Chemical Society
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172062/RS//
dc.rightsopenAccess
dc.sourceJournal of the Serbian Chemical Society
dc.subjectpolyurethane networksen
dc.subjecthyperbranched polyesteren
dc.subjectpoly(dimethylsiloxane)en
dc.subjectcrosslink densityen
dc.subjectthermal propertiesen
dc.subjectsurface propertiesen
dc.titlePoly(urethane-siloxane)s based on hyperbranched polyester as crosslinking agent: Synthesis and characterizationen
dc.titlePoli(uretan-siloksani) na bazi hiperrazgranatog poliestra kao umreživača - sinteza i karakterizacijasr
dc.typearticle
dc.rights.licenseBY-NC-ND
dcterms.abstractЈовановиц, Слободан; Радуловиц, Aлександра; Пергал, Марија; Остојиц, Сања; Джунузовић, Јасна; Пергал, Миодраг М.; Поли(уретан-силоксани) на бази хиперразгранатог полиестра као умреживача - синтеза и карактеризација; Поли(уретан-силоксани) на бази хиперразгранатог полиестра као умреживача - синтеза и карактеризација;
dc.citation.volume77
dc.citation.issue7
dc.citation.spage919
dc.citation.epage935
dc.citation.other77(7): 919-935
dc.citation.rankM23
dc.identifier.doi10.2298/JSC111013006P
dc.identifier.rcubConv_2841
dc.identifier.fulltexthttp://cer.ihtm.bg.ac.rs//bitstream/id/7652/1106.pdf
dc.identifier.scopus2-s2.0-84864614157
dc.identifier.wos000308382800008
dc.type.versionpublishedVersion


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