TY  - JOUR
AU  - Motloung, Benison T.
AU  - Dudić, Duško
AU  - Mofokeng, Julia P.
AU  - Luyt, Adriaan S.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1486
AB  - This paper reports on the presence of wax and radiation-induced crosslinking on the morphology, thermal and mechanical properties, as well as electrical conductivity and thermo-switch properties of LDPE containing different amounts of carbon black (CB) or carbon black plus zinc metal as filler. Although the filler was generally well dispersed in the polymer or polymer/wax blend, there were clear indications of the formation of conductive pathways. Different combinations of polymer, wax, CB and zinc filler and radiation induced crosslinking gave rise to different extents of crystallinity and/or chain immobilization, which had an influence on the mechanical and thermo-mechanical properties, and on the electrical conductivity and thermo-switch behaviour. Most importantly, the presence of wax, and CB and CB/Zn fillers, gave rise to increased electrical conductivity. The thermal expansion in the composites did not seem to play a significant role in obtaining larger values of the positive temperature coefficient of resistivity (PTC). We found that the presence of a small amount of paraffin wax significantly increased the PTC coefficients of the LDPE based conductive composites, and that gamma-radiation induced crosslinking provided the thermo-mechanical stability of the amorphous regions in LDPE needed to obtain a high PTC intensity, which would provide a cheap material with good thermo-switch functionality, which is something not observed before.
T2  - Journal of Polymer Research
T1  - Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax
VL  - 24
IS  - 3
DO  - 10.1007/s10965-017-1205-8
ER  - 

@article{
author = "Motloung, Benison T. and Dudić, Duško and Mofokeng, Julia P. and Luyt, Adriaan S.",
year = "2017",
abstract = "This paper reports on the presence of wax and radiation-induced crosslinking on the morphology, thermal and mechanical properties, as well as electrical conductivity and thermo-switch properties of LDPE containing different amounts of carbon black (CB) or carbon black plus zinc metal as filler. Although the filler was generally well dispersed in the polymer or polymer/wax blend, there were clear indications of the formation of conductive pathways. Different combinations of polymer, wax, CB and zinc filler and radiation induced crosslinking gave rise to different extents of crystallinity and/or chain immobilization, which had an influence on the mechanical and thermo-mechanical properties, and on the electrical conductivity and thermo-switch behaviour. Most importantly, the presence of wax, and CB and CB/Zn fillers, gave rise to increased electrical conductivity. The thermal expansion in the composites did not seem to play a significant role in obtaining larger values of the positive temperature coefficient of resistivity (PTC). We found that the presence of a small amount of paraffin wax significantly increased the PTC coefficients of the LDPE based conductive composites, and that gamma-radiation induced crosslinking provided the thermo-mechanical stability of the amorphous regions in LDPE needed to obtain a high PTC intensity, which would provide a cheap material with good thermo-switch functionality, which is something not observed before.",
journal = "Journal of Polymer Research",
title = "Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax",
volume = "24",
number = "3",
doi = "10.1007/s10965-017-1205-8"
}

Motloung, B. T., Dudić, D., Mofokeng, J. P.,& Luyt, A. S.. (2017). Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax. in Journal of Polymer Research, 24(3).
https://doi.org/10.1007/s10965-017-1205-8

Motloung BT, Dudić D, Mofokeng JP, Luyt AS. Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax. in Journal of Polymer Research. 2017;24(3).
doi:10.1007/s10965-017-1205-8 .

Motloung, Benison T., Dudić, Duško, Mofokeng, Julia P., Luyt, Adriaan S., "Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax" in Journal of Polymer Research, 24, no. 3 (2017),
https://doi.org/10.1007/s10965-017-1205-8 . .

TY  - JOUR
AU  - Ochigbo, Stephen S.
AU  - Luyt, Adriaan S.
AU  - Mofokeng, Julia P.
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
AU  - Đoković, Vladimir
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5076
AB  - Nanostructured lanthanum (III)-oxide (La2O3) particles were prepared by a polymer complex solution method and further used for the preparation of lanthanum hydroxide (La(OH)3) nanoparticles. The La(OH)3 nanopowder was mixed with glycerol-plasticized maize starch and the effect of the filler on the thermal, mechanical, and viscoelastic properties of the matrix was investigated. It was expected that this nanofiller, which shows an affinity toward OH groups, would strongly affect the physical properties of thermoplastic starch (TPS). The pure TPS and the TPS-La(OH)3 nanocomposite films (with 1, 2, and 3 wt % filler) were conditioned at various relative humidities (RHs) (35, 57, 75, and 99% RH). After conditioning at 99% RH, the pure TPS films exhibited higher affinity toward water than the nanocomposites. Differential scanning calorimetric measurements showed that, due to retrogradation effects, the melting enthalpies of the films increased with increasing RH. Dynamic mechanical analysis revealed that the mechanical properties in the linear range strongly depend on both the humidity conditions and the concentration of the filler. The results also show that La(OH)3 nanoparticles are good reinforcement for TPS films. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012
T2  - Journal of Applied Polymer Science
T1  - Dynamic mechanical and thermal properties of the composites of thermoplastic starch and lanthanum hydroxide nanoparticles
VL  - 127
IS  - 1
SP  - 699
EP  - 709
DO  - 10.1002/app.37859
ER  - 

@article{
author = "Ochigbo, Stephen S. and Luyt, Adriaan S. and Mofokeng, Julia P. and Antić, Željka and Dramićanin, Miroslav and Đoković, Vladimir",
year = "2013",
abstract = "Nanostructured lanthanum (III)-oxide (La2O3) particles were prepared by a polymer complex solution method and further used for the preparation of lanthanum hydroxide (La(OH)3) nanoparticles. The La(OH)3 nanopowder was mixed with glycerol-plasticized maize starch and the effect of the filler on the thermal, mechanical, and viscoelastic properties of the matrix was investigated. It was expected that this nanofiller, which shows an affinity toward OH groups, would strongly affect the physical properties of thermoplastic starch (TPS). The pure TPS and the TPS-La(OH)3 nanocomposite films (with 1, 2, and 3 wt % filler) were conditioned at various relative humidities (RHs) (35, 57, 75, and 99% RH). After conditioning at 99% RH, the pure TPS films exhibited higher affinity toward water than the nanocomposites. Differential scanning calorimetric measurements showed that, due to retrogradation effects, the melting enthalpies of the films increased with increasing RH. Dynamic mechanical analysis revealed that the mechanical properties in the linear range strongly depend on both the humidity conditions and the concentration of the filler. The results also show that La(OH)3 nanoparticles are good reinforcement for TPS films. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012",
journal = "Journal of Applied Polymer Science",
title = "Dynamic mechanical and thermal properties of the composites of thermoplastic starch and lanthanum hydroxide nanoparticles",
volume = "127",
number = "1",
pages = "699-709",
doi = "10.1002/app.37859"
}

Ochigbo, S. S., Luyt, A. S., Mofokeng, J. P., Antić, Ž., Dramićanin, M.,& Đoković, V.. (2013). Dynamic mechanical and thermal properties of the composites of thermoplastic starch and lanthanum hydroxide nanoparticles. in Journal of Applied Polymer Science, 127(1), 699-709.
https://doi.org/10.1002/app.37859

Ochigbo SS, Luyt AS, Mofokeng JP, Antić Ž, Dramićanin M, Đoković V. Dynamic mechanical and thermal properties of the composites of thermoplastic starch and lanthanum hydroxide nanoparticles. in Journal of Applied Polymer Science. 2013;127(1):699-709.
doi:10.1002/app.37859 .

Ochigbo, Stephen S., Luyt, Adriaan S., Mofokeng, Julia P., Antić, Željka, Dramićanin, Miroslav, Đoković, Vladimir, "Dynamic mechanical and thermal properties of the composites of thermoplastic starch and lanthanum hydroxide nanoparticles" in Journal of Applied Polymer Science, 127, no. 1 (2013):699-709,
https://doi.org/10.1002/app.37859 . .