TY  - JOUR
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Marković, Gordana
AU  - Konstantinovic, Sandra
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5562
AB  - Three types of nanosilica-based urea-formaldehyde (UF) hybrid composite materials with a formaldehyde-to-urea (F/U) ratio of 0.8 were synthesized (UF with SiO(2)Resin 1, UF+SiO2+thiourea [TU]Resin 2 and UF+SiO2+thiosemicarbazide [TSC]Resin 3). The thermal behavior of obtained materials was studied by nonisothermal thermogravimetric analysis (TGA), differential thermal gravimetry (DTG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC) and supported by data from Fourier transform infrared spectroscopy (FTIR). Nanosilica-based UF hybrid composites have been irradiated (50kGy) and after that their radiation stability was evaluated on the basis of thermal behavior. The percentage of free formaldehyde in all prepared samples was determined. DTG peaks of unmodified nanosilica-based UF resin (UF with SiO2) are shifted to a high temperature. The minimum percentage values of free formaldehyde (3%) for samples based on UF with SiO2 and UF+SiO2+TSC after irradiation dose of 50kGy are detected.
T2  - Journal of Thermoplastic Composite Materials
T1  - Radiation stability of nanosilica-based urea-formaldehyde composite materials
VL  - 26
IS  - 6
SP  - 747
EP  - 761
DO  - 10.1177/0892705711428661
ER  - 

@article{
author = "Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Marković, Gordana and Konstantinovic, Sandra and Marinović-Cincović, Milena",
year = "2013",
abstract = "Three types of nanosilica-based urea-formaldehyde (UF) hybrid composite materials with a formaldehyde-to-urea (F/U) ratio of 0.8 were synthesized (UF with SiO(2)Resin 1, UF+SiO2+thiourea [TU]Resin 2 and UF+SiO2+thiosemicarbazide [TSC]Resin 3). The thermal behavior of obtained materials was studied by nonisothermal thermogravimetric analysis (TGA), differential thermal gravimetry (DTG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC) and supported by data from Fourier transform infrared spectroscopy (FTIR). Nanosilica-based UF hybrid composites have been irradiated (50kGy) and after that their radiation stability was evaluated on the basis of thermal behavior. The percentage of free formaldehyde in all prepared samples was determined. DTG peaks of unmodified nanosilica-based UF resin (UF with SiO2) are shifted to a high temperature. The minimum percentage values of free formaldehyde (3%) for samples based on UF with SiO2 and UF+SiO2+TSC after irradiation dose of 50kGy are detected.",
journal = "Journal of Thermoplastic Composite Materials",
title = "Radiation stability of nanosilica-based urea-formaldehyde composite materials",
volume = "26",
number = "6",
pages = "747-761",
doi = "10.1177/0892705711428661"
}

Samaržija-Jovanović, S., Jovanović, V., Marković, G., Konstantinovic, S.,& Marinović-Cincović, M.. (2013). Radiation stability of nanosilica-based urea-formaldehyde composite materials. in Journal of Thermoplastic Composite Materials, 26(6), 747-761.
https://doi.org/10.1177/0892705711428661

Samaržija-Jovanović S, Jovanović V, Marković G, Konstantinovic S, Marinović-Cincović M. Radiation stability of nanosilica-based urea-formaldehyde composite materials. in Journal of Thermoplastic Composite Materials. 2013;26(6):747-761.
doi:10.1177/0892705711428661 .

Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Marković, Gordana, Konstantinovic, Sandra, Marinović-Cincović, Milena, "Radiation stability of nanosilica-based urea-formaldehyde composite materials" in Journal of Thermoplastic Composite Materials, 26, no. 6 (2013):747-761,
https://doi.org/10.1177/0892705711428661 . .

TY  - JOUR
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Konstantinovic, Sandra
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6911
AB  - The thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resins with hexamethylenetetramine-HMTA (Resin 1), melamine-M (Resin 2), and ethylene urea (EU, Resin 3) including nano-SiO2 was investigated by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG), and differential thermal analysis (DTA) supported by data from IR spectroscopy. Possibility of combining inorganic filler in a form of silicon dioxide with UF resins was found investigated and percentage of free formaldehyde was determined. The shift of DTG peaks to a high temperature indicates the increase of thermal stability of modified UF resin with EU (Resin 3) which is confirmed by data obtained from the FTIR study. The minimum percentage (6%) of free formaldehyde was obtained in Resin 3.
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Thermal behavior of modified urea-formaldehyde resins
VL  - 104
IS  - 3
SP  - 1159
EP  - 1166
DO  - 10.1007/s10973-010-1143-8
ER  - 

@article{
author = "Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Konstantinovic, Sandra and Marković, Gordana and Marinović-Cincović, Milena",
year = "2011",
abstract = "The thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resins with hexamethylenetetramine-HMTA (Resin 1), melamine-M (Resin 2), and ethylene urea (EU, Resin 3) including nano-SiO2 was investigated by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG), and differential thermal analysis (DTA) supported by data from IR spectroscopy. Possibility of combining inorganic filler in a form of silicon dioxide with UF resins was found investigated and percentage of free formaldehyde was determined. The shift of DTG peaks to a high temperature indicates the increase of thermal stability of modified UF resin with EU (Resin 3) which is confirmed by data obtained from the FTIR study. The minimum percentage (6%) of free formaldehyde was obtained in Resin 3.",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Thermal behavior of modified urea-formaldehyde resins",
volume = "104",
number = "3",
pages = "1159-1166",
doi = "10.1007/s10973-010-1143-8"
}

Samaržija-Jovanović, S., Jovanović, V., Konstantinovic, S., Marković, G.,& Marinović-Cincović, M.. (2011). Thermal behavior of modified urea-formaldehyde resins. in Journal of Thermal Analysis and Calorimetry, 104(3), 1159-1166.
https://doi.org/10.1007/s10973-010-1143-8

Samaržija-Jovanović S, Jovanović V, Konstantinovic S, Marković G, Marinović-Cincović M. Thermal behavior of modified urea-formaldehyde resins. in Journal of Thermal Analysis and Calorimetry. 2011;104(3):1159-1166.
doi:10.1007/s10973-010-1143-8 .

Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Konstantinovic, Sandra, Marković, Gordana, Marinović-Cincović, Milena, "Thermal behavior of modified urea-formaldehyde resins" in Journal of Thermal Analysis and Calorimetry, 104, no. 3 (2011):1159-1166,
https://doi.org/10.1007/s10973-010-1143-8 . .

TY  - JOUR
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Marković, Gordana
AU  - Konstantinovic, Sandra
AU  - Marinović-Cincović, Milena
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4377
AB  - Rheometric characteristics, curing kinetics, mechanical properties before and after thermal aging and morphology of nanocomposites based on various network precursors (i.e., acrylonitrile-butadiene rubber (NBR), ethylene-propilene-diene monomer (EPDM) and its blend (NBR/EPDM) reinforced of nanosilica) is presented here. The ratios of EPDM and NBR as binary blend system vary significantly. The rheometric characteristics and curing kinetics of nanocomposites were determined using a rheometer with an oscillating disk, in which the network formation process was registered by the varying torque durations. The mechanical properties of the elastomeric composites were determined before and after thermal aging using an air-circulating oven. The specific interactions between the rubber and filler were characterized by Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was employed to study the surface morphology of fractured rubber. The obtained results demonstrated a correlation between the calculated activation energies of cross linking (Eac) and reversion (Ear) and mechanical properties, which can be seen in sample EPDM/NBR = 20/80. For this blend, maximum tensile strength values and synergism were observed. Additionally, this blend exhibited a relatively co-continuous morphology, which was investigated by SEM. The differential scanning calorimetry (DSC) curves reported that the silica-reinforced EPDM/NBR rubber blends were immiscible. FIR studies showed a strong interaction between the polymer matrix and filler, which was reflected in the peak shifts at 1441.9 and 1462.5 cm(-1) to higher wave numbers. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Composites: Part B: Engineering
T1  - Nanocomposites based on silica-reinforced ethylene-propylene-diene-monomer/acrylonitrile-butadiene rubber blends
VL  - 42
IS  - 5
SP  - 1244
EP  - 1250
DO  - 10.1016/j.compositesb.2011.02.008
ER  - 

@article{
author = "Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Marković, Gordana and Konstantinovic, Sandra and Marinović-Cincović, Milena",
year = "2011",
abstract = "Rheometric characteristics, curing kinetics, mechanical properties before and after thermal aging and morphology of nanocomposites based on various network precursors (i.e., acrylonitrile-butadiene rubber (NBR), ethylene-propilene-diene monomer (EPDM) and its blend (NBR/EPDM) reinforced of nanosilica) is presented here. The ratios of EPDM and NBR as binary blend system vary significantly. The rheometric characteristics and curing kinetics of nanocomposites were determined using a rheometer with an oscillating disk, in which the network formation process was registered by the varying torque durations. The mechanical properties of the elastomeric composites were determined before and after thermal aging using an air-circulating oven. The specific interactions between the rubber and filler were characterized by Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was employed to study the surface morphology of fractured rubber. The obtained results demonstrated a correlation between the calculated activation energies of cross linking (Eac) and reversion (Ear) and mechanical properties, which can be seen in sample EPDM/NBR = 20/80. For this blend, maximum tensile strength values and synergism were observed. Additionally, this blend exhibited a relatively co-continuous morphology, which was investigated by SEM. The differential scanning calorimetry (DSC) curves reported that the silica-reinforced EPDM/NBR rubber blends were immiscible. FIR studies showed a strong interaction between the polymer matrix and filler, which was reflected in the peak shifts at 1441.9 and 1462.5 cm(-1) to higher wave numbers. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Composites: Part B: Engineering",
title = "Nanocomposites based on silica-reinforced ethylene-propylene-diene-monomer/acrylonitrile-butadiene rubber blends",
volume = "42",
number = "5",
pages = "1244-1250",
doi = "10.1016/j.compositesb.2011.02.008"
}

Samaržija-Jovanović, S., Jovanović, V., Marković, G., Konstantinovic, S.,& Marinović-Cincović, M.. (2011). Nanocomposites based on silica-reinforced ethylene-propylene-diene-monomer/acrylonitrile-butadiene rubber blends. in Composites: Part B: Engineering, 42(5), 1244-1250.
https://doi.org/10.1016/j.compositesb.2011.02.008

Samaržija-Jovanović S, Jovanović V, Marković G, Konstantinovic S, Marinović-Cincović M. Nanocomposites based on silica-reinforced ethylene-propylene-diene-monomer/acrylonitrile-butadiene rubber blends. in Composites: Part B: Engineering. 2011;42(5):1244-1250.
doi:10.1016/j.compositesb.2011.02.008 .

Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Marković, Gordana, Konstantinovic, Sandra, Marinović-Cincović, Milena, "Nanocomposites based on silica-reinforced ethylene-propylene-diene-monomer/acrylonitrile-butadiene rubber blends" in Composites: Part B: Engineering, 42, no. 5 (2011):1244-1250,
https://doi.org/10.1016/j.compositesb.2011.02.008 . .