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Vatrootporni kompoziti na bazi fosfatnih estara kraft lignina i poliesterske smole - ekološki prihvatljiv materijal za sisteme termičke zaštite raketnih goriva

dc.creatorRusmirović, Jelena
dc.creatorLukić, Vesna
dc.creatorKovačević, Tihomir
dc.creatorBogosavljević, Marica
dc.creatorBrzić, Saša
dc.creatorMarinković, Aleksandar
dc.creatorStevanović, Tatjana
dc.date.accessioned2021-03-10T14:09:37Z
dc.date.available2021-03-10T14:09:37Z
dc.date.issued2019
dc.identifier.issn1820-0206
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/4293
dc.description.abstractPresented study was aimed to investigate the influence of surface functionalization of the industrial kraft lignin (KL) on mechanical and thermal properties of high-performance and fireproof composites based on unsaturated polyester (UPe) resin. In order to improve flame retardant properties, surface of the KL was modified by phosphorylation method in two-step process. First, direct grafting of phosphorus chloride on KL phenolic hydroxyl groups was performed and phosphoric acid ester of KL was formed. In the second step, phosphor ester of KL was recovered by precipitation in cooled isopropyl alcohol and the final obtained product, phosphorylated industrial kraft lignin with methyl terminal groups (KLP) was obtained. KLP mass contents in UPe based composites varied from 0.5 wt.% to 5.0 wt.%. Structural characterization was done via Fourier Transform-Infrared Spectroscopy (FT-IR). The effects of KLP surface functionalization and KLP mass contents on the UPe tensile properties were studied. Tensile strength (σ), elongation (ε) and Young's modulus of elasticity (E) and Shore A (Sh A) hardness of the UPe/KLP composites were analyzed in relation to the structure of KLP modification. Tensile testing results showed an increase in σ of 31 % for UPe/KL sample with 1.0 wt.% KL particles compared to the bare UPe matrix. The origin and cause of fracture that occurred during uniaxial tensile testing were analyzed using stereo microscopy. The obtained composites were tested on fire retardant properties in accordance with the standard test method UL-94V, and composites with 5.0 wt.% loaded KLP achieved V-1 category.en
dc.description.abstractU radu su prikazani rezultati ispitivanja mogućnosti primene fosfatnih estara kraft lignina kao usporivača gorivosti u polimernim kompozitnim materijalima baziranim na nezasićenim poliestеrskim smolama. Sinteza fosfatnih estara lignina (funkcionalizacija lignina) izvršena je direktnim graftovanjem fosforoksihlorida na slobodne polifenolne grupe iz lignina, i potom hidrolizom hloridnih grupa izopropil alkoholom. Maseni sadržaj čistog i funkcionalizovanog lignina u poliestеrskim smolama variran je od 0,5 mas. % do 5,0 mas. %. Strukturna karakterizacija funkcionalizovanog kraft lignina i kompozita izvršena je primenom FT-IR spektroskopije. Proučavan je uticaj funkcionalizacije i masenog udela kraft lignina na tvrdoću, zatezna i termička svojstva nezasićenih poliestеrskih smola. Rezultati ispitivanja jednoosnog istezanja pokazali su da je povećanje zatezne čvrstoće od 31 % postignuto ugradnjom 1,0 % nefunkcionalizovanih čestica kraft lignina. Mehanizam nastajanja loma prilikom jednoosnog istezanja analiziran je primeneom stereomikroskopije. Termička svojstva kompozita analizirana su prema standardnoj metodi UL-94 na osnovu koje je kompozit sa 5,0 mas. % funkcionalizovanog lignina svrstan u najvišu kategoriju termootpornih materijala, V-1, a da su zatezna svojstva i tvrdoća po Šoru (eng. Shore A) ostala zadovoljavajuća.sr
dc.publisherMilitary Technical Institute, Belgrade
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScientific Technical Review
dc.subjectignin modificationen
dc.subjectfireproof lignin compositesen
dc.subjecttensile testingen
dc.subjectflame retardancyen
dc.subjectfunkcionalizacija ligninasr
dc.subjecttermootporni kompoziti na bazi ligninasr
dc.subjectjednosono istezanjesr
dc.subjectinhibitori gorivostisr
dc.titleFireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systemsen
dc.titleVatrootporni kompoziti na bazi fosfatnih estara kraft lignina i poliesterske smole - ekološki prihvatljiv materijal za sisteme termičke zaštite raketnih gorivasr
dc.typearticle
dc.rights.licenseBY
dc.citation.epage22
dc.citation.issue1
dc.citation.other69(1): 16-22
dc.citation.rankM51
dc.citation.spage16
dc.citation.volume69
dc.identifier.doi10.5937/str1901016R
dc.identifier.fulltexthttp://TechnoRep.tmf.bg.ac.rs/bitstream/id/10044/1820-02061901016R.pdf
dc.type.versionpublishedVersion


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