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Vera Obradović,Dušica B. Stojanović,Ivona Janković Častvan,Vesna Radojević,Petar S. Uskoković 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
The aim of this study was to fabricate a new kind of hybrid fabric composites with the cross-linked electrospun poly(vinyl butyral) (PVB) composite nanofibres. The experiments were performed with the 10 wt.% PVB/ethanol solution for electrospinning where the modified silica nanoparticles (mSiO2), the oxidised single-walled carbon nanotubes (o- SWCNT) and the o-SWCNT/mSiO2 hybrid nanoparticles were added to the solution. The electrospun fibres were crosslinked with glutaraldehyde (GA) afterwards in order to reinforce the composite structure by bonding to the p-aramid fabrics. The chemical and thermo-mechanical properties of the hybrid fabric composites were evaluated. The greatest improvement in thermo-mechanical properties was achieved by the sample which contained the cross-linked PVB fibres with the o- SWCNT/mSiO2 hybrid nanoparticles.
Vera Obradović,Danica Simić,Milorad Zrilić,Dušica B. Stojanović,Petar S. Uskoković 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2
Multilayered composites based on aramid fabrics are widely used in impact protection. The objective of this studyis 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 andanti-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-WS2 nanoparticles. The surfaces of IF-WS2were 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 producednearly 62 % of improvement in the tensile strength and 51 % of improvement in the tensile energy absorption compared tothe Kolon/PVB sample. Furthermore, the sample with the o-SWCNT/m-IF hybrid nanoparticles demonstrated 24 % ofenhancement in the impact toughness and 48 % of improvement in the absorbed energy after knife penetration in comparisonwith the Kolon/PVB sample.
Milan N. Mitić,Mirjana V. Obradović,Danijela A. Kostić,Ružica J. Micić,Dušan Đ. Paunović 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.6
The antioxidant capacity and the phenolic content of 3 dried red currant samples from different geographical regions were studied. Three solvent systems were used (methanol, ethanol, and acetone) at the same concentrations (70%) and with 100% deionized water in presence 0.1% HCl. The antioxidant capacity of the dried fruit extracts was evaluated using DPPH radical scavenging assays. The efficiency of the solvents used to extract phenols from the 3 dried red currant samples varied considerably. The polyphenol content of the dried red currant samples was 3.26 to 12.68 mg gallic acid equivalent/g dried fruit. The high phenolic content was significantly correlated with the high antioxidant capacity. The following compounds were identified and quantified using HPLC with photodiode-array detection: 3 anthocyanins,2 flavonols, 2 flavan-3-ols, and 3 hydroxycinnamic acids in all samples. Generally, red currant fruits are a rich source of phenolics, which shows an evident antioxidant capacity.