TY  - CONF
AU  - Bajić, Danica M.
AU  - Fidanovski, Bojana
AU  - Radisavljević, Igor
AU  - Bogosavljević, Marica
AU  - Totovski, Ljubica
AU  - Stojanović, Dušica B.
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6933
AB  - As one of transition metal dichalogenides, tungsten disulphide (WS2) is well known for its solid
lubricating behavior, but besides this feature, it exhibits extraordinary thermal stability and mechanical
resistance. The outstanding mechanical strength of WS2 is most pronounced when it comes in form of
multi-layer hollow nanoparticles and nanotubes: inorganic fullerene-like nanoparticles and inorganic
nanotubes, denoted as IF-WS2 and INT-WS2, respectively. These structures have extraordinary shock resistance
properties, pressure and heat resistance, that can be exploited for a variety of applications. They have been
studied as reinforcing fillers of various polymers, but they might be also added as reinforcement of matrix in
more complex composites, like CFRPs. Our research aimed to examine their reinforcing effect on laminated
composites based on aramid fabric and poly(vinyl butyral), PVB, intended for demanding applications: in
personal protection equipment, ballistic protection, sports equipment, automotive, nautical and aircraft
engineering. WS2 nanostructures have been incorporated in PVB by temporary dissolving in ethanol, by
ultrasonication and intensive mechanical mixing. After impregnation of aramid fabrics ethanol would
evaporate, and layers of aramid with thermoplastic binder PVB would be integrated by hot pressing. SEM
analysis confirms the uniform distribution of WS2 nanostructures in the prepared composite material. DSC
analysis reveals the effect of WS2 addition on thermal resistance of the new material, while PVB/aramid
mechanical resistance was examined using DMA, impact test and tensile test. IF- WS2 has imported higher
thermal resistance and ductility improvement, while INT-WS2 has significantly improved tensile and impact
strength of the composite.
C3  - Abstract Book / 3 rd Edition of Materials Science and Nanoscience Webinar, V-Mat2021, September 17-18, 2021
T1  - WS2 nanostructures as thermo-mechanical reinforcement of composite materials for advanced applications
SP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6933
ER  - 

@conference{
author = "Bajić, Danica M. and Fidanovski, Bojana and Radisavljević, Igor and Bogosavljević, Marica and Totovski, Ljubica and Stojanović, Dušica B.",
year = "2021",
abstract = "As one of transition metal dichalogenides, tungsten disulphide (WS2) is well known for its solid
lubricating behavior, but besides this feature, it exhibits extraordinary thermal stability and mechanical
resistance. The outstanding mechanical strength of WS2 is most pronounced when it comes in form of
multi-layer hollow nanoparticles and nanotubes: inorganic fullerene-like nanoparticles and inorganic
nanotubes, denoted as IF-WS2 and INT-WS2, respectively. These structures have extraordinary shock resistance
properties, pressure and heat resistance, that can be exploited for a variety of applications. They have been
studied as reinforcing fillers of various polymers, but they might be also added as reinforcement of matrix in
more complex composites, like CFRPs. Our research aimed to examine their reinforcing effect on laminated
composites based on aramid fabric and poly(vinyl butyral), PVB, intended for demanding applications: in
personal protection equipment, ballistic protection, sports equipment, automotive, nautical and aircraft
engineering. WS2 nanostructures have been incorporated in PVB by temporary dissolving in ethanol, by
ultrasonication and intensive mechanical mixing. After impregnation of aramid fabrics ethanol would
evaporate, and layers of aramid with thermoplastic binder PVB would be integrated by hot pressing. SEM
analysis confirms the uniform distribution of WS2 nanostructures in the prepared composite material. DSC
analysis reveals the effect of WS2 addition on thermal resistance of the new material, while PVB/aramid
mechanical resistance was examined using DMA, impact test and tensile test. IF- WS2 has imported higher
thermal resistance and ductility improvement, while INT-WS2 has significantly improved tensile and impact
strength of the composite.",
journal = "Abstract Book / 3 rd Edition of Materials Science and Nanoscience Webinar, V-Mat2021, September 17-18, 2021",
title = "WS2 nanostructures as thermo-mechanical reinforcement of composite materials for advanced applications",
pages = "40",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6933"
}

Bajić, D. M., Fidanovski, B., Radisavljević, I., Bogosavljević, M., Totovski, L.,& Stojanović, D. B.. (2021). WS2 nanostructures as thermo-mechanical reinforcement of composite materials for advanced applications. in Abstract Book / 3 rd Edition of Materials Science and Nanoscience Webinar, V-Mat2021, September 17-18, 2021, 40.
https://hdl.handle.net/21.15107/rcub_technorep_6933

Bajić DM, Fidanovski B, Radisavljević I, Bogosavljević M, Totovski L, Stojanović DB. WS2 nanostructures as thermo-mechanical reinforcement of composite materials for advanced applications. in Abstract Book / 3 rd Edition of Materials Science and Nanoscience Webinar, V-Mat2021, September 17-18, 2021. 2021;:40.
https://hdl.handle.net/21.15107/rcub_technorep_6933 .

Bajić, Danica M., Fidanovski, Bojana, Radisavljević, Igor, Bogosavljević, Marica, Totovski, Ljubica, Stojanović, Dušica B., "WS2 nanostructures as thermo-mechanical reinforcement of composite materials for advanced applications" in Abstract Book / 3 rd Edition of Materials Science and Nanoscience Webinar, V-Mat2021, September 17-18, 2021 (2021):40,
https://hdl.handle.net/21.15107/rcub_technorep_6933 .

TY  - JOUR
AU  - Rusmirović, Jelena
AU  - Lukić, Vesna
AU  - Kovačević, Tihomir
AU  - Bogosavljević, Marica
AU  - Brzić, Saša
AU  - Marinković, Aleksandar
AU  - Stevanović, Tatjana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4293
AB  - Presented 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.
AB  - U 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.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Fireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systems
T1  - Vatrootporni kompoziti na bazi fosfatnih estara kraft lignina i poliesterske smole - ekološki prihvatljiv materijal za sisteme termičke zaštite raketnih goriva
EP  - 22
IS  - 1
SP  - 16
VL  - 69
DO  - 10.5937/str1901016R
ER  - 

@article{
author = "Rusmirović, Jelena and Lukić, Vesna and Kovačević, Tihomir and Bogosavljević, Marica and Brzić, Saša and Marinković, Aleksandar and Stevanović, Tatjana",
year = "2019",
abstract = "Presented 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., U 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.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Fireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systems, Vatrootporni kompoziti na bazi fosfatnih estara kraft lignina i poliesterske smole - ekološki prihvatljiv materijal za sisteme termičke zaštite raketnih goriva",
pages = "22-16",
number = "1",
volume = "69",
doi = "10.5937/str1901016R"
}

Rusmirović, J., Lukić, V., Kovačević, T., Bogosavljević, M., Brzić, S., Marinković, A.,& Stevanović, T.. (2019). Fireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systems. in Scientific Technical Review
Military Technical Institute, Belgrade., 69(1), 16-22.
https://doi.org/10.5937/str1901016R

Rusmirović J, Lukić V, Kovačević T, Bogosavljević M, Brzić S, Marinković A, Stevanović T. Fireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systems. in Scientific Technical Review. 2019;69(1):16-22.
doi:10.5937/str1901016R .

Rusmirović, Jelena, Lukić, Vesna, Kovačević, Tihomir, Bogosavljević, Marica, Brzić, Saša, Marinković, Aleksandar, Stevanović, Tatjana, "Fireproof phosphorylated kraft lignin/polyester based composites: Green material for rocket propellant thermal protection systems" in Scientific Technical Review, 69, no. 1 (2019):16-22,
https://doi.org/10.5937/str1901016R . .