TY  - JOUR
AU  - Obradović, Vera
AU  - Simic, Danica
AU  - Zrilic, Milorad
AU  - Stojanović, Dušica
AU  - Uskoković, Petar
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4968
AB  - Multilayered composites based on aramid fabrics are widely used in impact protection. The objective of this study is creating a new kind of multiaxial aramid fabric composites with inorganic fullerene-like tungsten disulfide nanoparticles (IF-WS2) and single walled carbon nanotubes (SWCNT) used as nanoreinforcement to enhance the dynamic mechanical and anti-stabbing properties of the composites. The four composites of the Kolon fabric forms were impregnated with 10 wt.% poly(vinyl butyral) (PVB)/ethanol solution which contained different forms of IF-WS nanoparticles. The surfaces of IF-WS2 were coated with silane coupling agent (m-IF) and the SWCNT were oxidized (o-SWCNT) for the fabrication of the o-SWCNT/m-IF hybrid nanoparticles. The mechanical testing showed that the Kolon/PVB/o-SWCNT/m-IF sample produced nearly 62 % of improvement in the tensile strength and 51 % of improvement in the tensile energy absorption compared to the Kolon/PVB sample. Furthermore, the sample with the o-SWCNT/m-IF hybrid nanoparticles demonstrated 24 % of enhancement in the impact toughness and 48 % of improvement in the absorbed energy after knife penetration in comparison with the Kolon/PVB sample.
T2  - Fibers and Polymers
T1  - Novel Hybrid Nanostructures of Carbon Nanotube/Fullerene-like Tungsten Disulfide as Reinforcement for Aramid Fabric Composites
EP  - 539
IS  - 2
SP  - 528
VL  - 22
DO  - 10.1007/s12221-021-0278-5
ER  - 

@article{
author = "Obradović, Vera and Simic, Danica and Zrilic, Milorad and Stojanović, Dušica and Uskoković, Petar",
year = "2021",
abstract = "Multilayered composites based on aramid fabrics are widely used in impact protection. The objective of this study is creating a new kind of multiaxial aramid fabric composites with inorganic fullerene-like tungsten disulfide nanoparticles (IF-WS2) and single walled carbon nanotubes (SWCNT) used as nanoreinforcement to enhance the dynamic mechanical and anti-stabbing properties of the composites. The four composites of the Kolon fabric forms were impregnated with 10 wt.% poly(vinyl butyral) (PVB)/ethanol solution which contained different forms of IF-WS nanoparticles. The surfaces of IF-WS2 were coated with silane coupling agent (m-IF) and the SWCNT were oxidized (o-SWCNT) for the fabrication of the o-SWCNT/m-IF hybrid nanoparticles. The mechanical testing showed that the Kolon/PVB/o-SWCNT/m-IF sample produced nearly 62 % of improvement in the tensile strength and 51 % of improvement in the tensile energy absorption compared to the Kolon/PVB sample. Furthermore, the sample with the o-SWCNT/m-IF hybrid nanoparticles demonstrated 24 % of enhancement in the impact toughness and 48 % of improvement in the absorbed energy after knife penetration in comparison with the Kolon/PVB sample.",
journal = "Fibers and Polymers",
title = "Novel Hybrid Nanostructures of Carbon Nanotube/Fullerene-like Tungsten Disulfide as Reinforcement for Aramid Fabric Composites",
pages = "539-528",
number = "2",
volume = "22",
doi = "10.1007/s12221-021-0278-5"
}

Obradović, V., Simic, D., Zrilic, M., Stojanović, D.,& Uskoković, P.. (2021). Novel Hybrid Nanostructures of Carbon Nanotube/Fullerene-like Tungsten Disulfide as Reinforcement for Aramid Fabric Composites. in Fibers and Polymers, 22(2), 528-539.
https://doi.org/10.1007/s12221-021-0278-5

Obradović V, Simic D, Zrilic M, Stojanović D, Uskoković P. Novel Hybrid Nanostructures of Carbon Nanotube/Fullerene-like Tungsten Disulfide as Reinforcement for Aramid Fabric Composites. in Fibers and Polymers. 2021;22(2):528-539.
doi:10.1007/s12221-021-0278-5 .

Obradović, Vera, Simic, Danica, Zrilic, Milorad, Stojanović, Dušica, Uskoković, Petar, "Novel Hybrid Nanostructures of Carbon Nanotube/Fullerene-like Tungsten Disulfide as Reinforcement for Aramid Fabric Composites" in Fibers and Polymers, 22, no. 2 (2021):528-539,
https://doi.org/10.1007/s12221-021-0278-5 . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Simic, Danica
AU  - Sejkot, Petr
AU  - Machalicka, Klara, V
AU  - Vokac, Miroslav
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4929
AB  - Para-aramid fibers (Kolon) are high performance polymeric fibers characterized by their high tenacity and impact resistance. They are used for the soft body armor structures in ballistics. In this study, the testing specimens were made from multilayered Kolon fabrics impregnated with epoxy resin where silicon carbide (SiC) microparticles or SiC nanofibers were added as reinforcement. The laminated composite samples were fabricated by hot compression and curing of epoxy resin. The tensile and impact strengths of the untreated specimens were compared with the ones that underwent water absorption in duration of 72 h (immersion or humidity) followed by desorption. The immersion of the specimens in water and exposure to high humidity (70%) were performed according to the ISO 62 standard while the tensile test was carried out in accordance with the ASTM D 3039 standard. In the end, the tensile test simulation of the laminated composite by using software Abaqus (R) was accomplished.
T2  - Current Applied Physics
T1  - Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites
EP  - 23
SP  - 16
VL  - 26
DO  - 10.1016/j.cap.2021.03.015
ER  - 

@article{
author = "Obradović, Vera and Simic, Danica and Sejkot, Petr and Machalicka, Klara, V and Vokac, Miroslav",
year = "2021",
abstract = "Para-aramid fibers (Kolon) are high performance polymeric fibers characterized by their high tenacity and impact resistance. They are used for the soft body armor structures in ballistics. In this study, the testing specimens were made from multilayered Kolon fabrics impregnated with epoxy resin where silicon carbide (SiC) microparticles or SiC nanofibers were added as reinforcement. The laminated composite samples were fabricated by hot compression and curing of epoxy resin. The tensile and impact strengths of the untreated specimens were compared with the ones that underwent water absorption in duration of 72 h (immersion or humidity) followed by desorption. The immersion of the specimens in water and exposure to high humidity (70%) were performed according to the ISO 62 standard while the tensile test was carried out in accordance with the ASTM D 3039 standard. In the end, the tensile test simulation of the laminated composite by using software Abaqus (R) was accomplished.",
journal = "Current Applied Physics",
title = "Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites",
pages = "23-16",
volume = "26",
doi = "10.1016/j.cap.2021.03.015"
}

Obradović, V., Simic, D., Sejkot, P., Machalicka, K. V.,& Vokac, M.. (2021). Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites. in Current Applied Physics, 26, 16-23.
https://doi.org/10.1016/j.cap.2021.03.015

Obradović V, Simic D, Sejkot P, Machalicka KV, Vokac M. Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites. in Current Applied Physics. 2021;26:16-23.
doi:10.1016/j.cap.2021.03.015 .

Obradović, Vera, Simic, Danica, Sejkot, Petr, Machalicka, Klara, V, Vokac, Miroslav, "Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites" in Current Applied Physics, 26 (2021):16-23,
https://doi.org/10.1016/j.cap.2021.03.015 . .

TY  - JOUR
AU  - Samolov, Aleksandra D.
AU  - Simic, Danica M.
AU  - Fidanovski, Bojana Z.
AU  - Obradović, Vera
AU  - Tomic, Ljubisa D.
AU  - Knezevic, Dragan M.
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4824
AB  - In order to examine the possibility to improve its camouflage properties standard cotton fabric with camouflage print was impregnated with poly(vinyl butyral), PVB and fullerene-like nanoparticles of tungsten disulfide, PVB/IF-WS2. FTIR analysis excluded any possible chemical interaction of IF-WS2 with PVB and the fabric. The camouflage behavior of the impregnated fabric has been examined firstly in the VIS part of the spectrum. Diffuse reflection, specular gloss and color coordinates were measured for three different shades (black, brown and dark green). Thermal imaging was applied to examine the camouflage abilities of this impregnation in IR part of the spectrum. The obtained results show that PVB/IF-WS2 impregnation system induced enhacement of the materials camouflage properties, i.e. that IF-WS2 have a positive effect on spectrophotometric characteristics of the fabric. (c) 2020 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
T2  - Defence Technology
T1  - Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS2
EP  - 2056
IS  - 6
SP  - 2050
VL  - 17
DO  - 10.1016/j.dt.2020.10.008
ER  - 

@article{
author = "Samolov, Aleksandra D. and Simic, Danica M. and Fidanovski, Bojana Z. and Obradović, Vera and Tomic, Ljubisa D. and Knezevic, Dragan M.",
year = "2021",
abstract = "In order to examine the possibility to improve its camouflage properties standard cotton fabric with camouflage print was impregnated with poly(vinyl butyral), PVB and fullerene-like nanoparticles of tungsten disulfide, PVB/IF-WS2. FTIR analysis excluded any possible chemical interaction of IF-WS2 with PVB and the fabric. The camouflage behavior of the impregnated fabric has been examined firstly in the VIS part of the spectrum. Diffuse reflection, specular gloss and color coordinates were measured for three different shades (black, brown and dark green). Thermal imaging was applied to examine the camouflage abilities of this impregnation in IR part of the spectrum. The obtained results show that PVB/IF-WS2 impregnation system induced enhacement of the materials camouflage properties, i.e. that IF-WS2 have a positive effect on spectrophotometric characteristics of the fabric. (c) 2020 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).",
journal = "Defence Technology",
title = "Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS2",
pages = "2056-2050",
number = "6",
volume = "17",
doi = "10.1016/j.dt.2020.10.008"
}

Samolov, A. D., Simic, D. M., Fidanovski, B. Z., Obradović, V., Tomic, L. D.,& Knezevic, D. M.. (2021). Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS2. in Defence Technology, 17(6), 2050-2056.
https://doi.org/10.1016/j.dt.2020.10.008

Samolov AD, Simic DM, Fidanovski BZ, Obradović V, Tomic LD, Knezevic DM. Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS2. in Defence Technology. 2021;17(6):2050-2056.
doi:10.1016/j.dt.2020.10.008 .

Samolov, Aleksandra D., Simic, Danica M., Fidanovski, Bojana Z., Obradović, Vera, Tomic, Ljubisa D., Knezevic, Dragan M., "Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS2" in Defence Technology, 17, no. 6 (2021):2050-2056,
https://doi.org/10.1016/j.dt.2020.10.008 . .