TY  - JOUR
AU  - Trifunovic, Sasa B.
AU  - Miličević, Dejan S.
AU  - Mićić, Maja M.
AU  - Mudrinic, Tihana M.
AU  - Suljovrujić, Edin H.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4309
AB  - This paper presents the influence of ageing on the morphological and optical properties of TPD (N,N-bis(3-methylphenil)-N,N- diphenylbenzidine) thin films. Understanding of the nucleation mechanism and growth dynamics of molecular thin films is pivotal for controlling their morphology and the film interfacial properties, while the influence of ageing is essential for the potential commercial utilization. Initially, thin films were prepared using a combinatorial physical vapour deposition (CPVD) method, following a cosine-like distribution profile of thickness along mono-crystal silica substrate. Morphology of thin films was investigated by using optical (OM) and atomic force microscopy (AFM). The link between optical properties and the resulting thin film morphology was made by spatially correlated morphological (AFM and OM) and optical (absorption and photoluminescence) measurements. The changes in the absorption and photoluminescence spectra are strongly connected to the ageing-induced changes in the microstructure of thin films. Regardless of morphological and differences in the film thickness (two orders of magnitude), all films show amorphous arrangement just after the deposition. Ageing of these films in regular atmosphere conditions results in morphological and changes in optical properties induced by the crystallization. The crystallization of initially amorphous samples was also confirmed by the differentional scanning calorimetry (DSC) measurements. All results indicate the limited possibility of using TPD films in organic electroluminescent devices.
T2  - Hemijska industrija
T1  - The Influence of Ageing on the Morphological and Optical Properties of Thin Tpd Films
VL  - 65
IS  - 1
SP  - 9
EP  - 13
DO  - 10.2298/HEMIND100519062T
ER  - 

@article{
author = "Trifunovic, Sasa B. and Miličević, Dejan S. and Mićić, Maja M. and Mudrinic, Tihana M. and Suljovrujić, Edin H.",
year = "2011",
abstract = "This paper presents the influence of ageing on the morphological and optical properties of TPD (N,N-bis(3-methylphenil)-N,N- diphenylbenzidine) thin films. Understanding of the nucleation mechanism and growth dynamics of molecular thin films is pivotal for controlling their morphology and the film interfacial properties, while the influence of ageing is essential for the potential commercial utilization. Initially, thin films were prepared using a combinatorial physical vapour deposition (CPVD) method, following a cosine-like distribution profile of thickness along mono-crystal silica substrate. Morphology of thin films was investigated by using optical (OM) and atomic force microscopy (AFM). The link between optical properties and the resulting thin film morphology was made by spatially correlated morphological (AFM and OM) and optical (absorption and photoluminescence) measurements. The changes in the absorption and photoluminescence spectra are strongly connected to the ageing-induced changes in the microstructure of thin films. Regardless of morphological and differences in the film thickness (two orders of magnitude), all films show amorphous arrangement just after the deposition. Ageing of these films in regular atmosphere conditions results in morphological and changes in optical properties induced by the crystallization. The crystallization of initially amorphous samples was also confirmed by the differentional scanning calorimetry (DSC) measurements. All results indicate the limited possibility of using TPD films in organic electroluminescent devices.",
journal = "Hemijska industrija",
title = "The Influence of Ageing on the Morphological and Optical Properties of Thin Tpd Films",
volume = "65",
number = "1",
pages = "9-13",
doi = "10.2298/HEMIND100519062T"
}

Trifunovic, S. B., Miličević, D. S., Mićić, M. M., Mudrinic, T. M.,& Suljovrujić, E. H.. (2011). The Influence of Ageing on the Morphological and Optical Properties of Thin Tpd Films. in Hemijska industrija, 65(1), 9-13.
https://doi.org/10.2298/HEMIND100519062T

Trifunovic SB, Miličević DS, Mićić MM, Mudrinic TM, Suljovrujić EH. The Influence of Ageing on the Morphological and Optical Properties of Thin Tpd Films. in Hemijska industrija. 2011;65(1):9-13.
doi:10.2298/HEMIND100519062T .

Trifunovic, Sasa B., Miličević, Dejan S., Mićić, Maja M., Mudrinic, Tihana M., Suljovrujić, Edin H., "The Influence of Ageing on the Morphological and Optical Properties of Thin Tpd Films" in Hemijska industrija, 65, no. 1 (2011):9-13,
https://doi.org/10.2298/HEMIND100519062T . .

TY  - JOUR
AU  - Miličević, Dejan S.
AU  - Trifunovic, Sasa B.
AU  - Mudrinic, Tihana M.
AU  - Leskovac, Andreja
AU  - Ignjatović, Nenad L.
AU  - Dojčilović, Jablan R.
AU  - Suljovrujić, Edin H.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4121
AB  - The influence of gamma radiation on the structure and glass transition behaviour of poly-L-lactide (PLLA) has been studied. Since PLLA exposed to high-energy radiation in the presence of air is prone to chain scission reactions and large degradation, changes in molecular weight were obtained by the gel permeation chromatography (GPC). Alterations in the glass transition behaviour were investigated by differential scanning calorimetry (DSC). The apparent activation energy, Delta H*, for the glass transition was determined on the basis of the heating rate dependence of the glass transition temperature, T(g). Our findings support the fact that chain scission is the main reason for the decrease of Tg and Delta H* with the absorbed dose. At low doses, despite large changes in molecular weight, only small alterations are observed in the glass transition temperature and apparent activation energy. Further increase in the absorbed dose introduces not only significant changes in the molecular weight but also in the glass transition temperature and the activation energy. Such glass transition behaviour is a manifestation of a well-known effect of molecular weight on Tg, postulated by the Fox-Flory equation. However, all the observed alterations are small and tolerable at absorbed doses required for sterilization (up to 25 kGy in most circumstances). Furthermore, this study reveals that the radiation-induced changes in the molecular weight and the glass transition temperature occur in a predictable and fairly accurate manner. Therefore, gamma radiation can be used not only for sterilization but also for tailoring desirable end-use properties of PLLA based implants.
T2  - Hemijska industrija
T1  - The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation
VL  - 64
IS  - 4
SP  - 275
EP  - 281
DO  - 10.2298/HEMIND100329020M
ER  - 

@article{
author = "Miličević, Dejan S. and Trifunovic, Sasa B. and Mudrinic, Tihana M. and Leskovac, Andreja and Ignjatović, Nenad L. and Dojčilović, Jablan R. and Suljovrujić, Edin H.",
year = "2010",
abstract = "The influence of gamma radiation on the structure and glass transition behaviour of poly-L-lactide (PLLA) has been studied. Since PLLA exposed to high-energy radiation in the presence of air is prone to chain scission reactions and large degradation, changes in molecular weight were obtained by the gel permeation chromatography (GPC). Alterations in the glass transition behaviour were investigated by differential scanning calorimetry (DSC). The apparent activation energy, Delta H*, for the glass transition was determined on the basis of the heating rate dependence of the glass transition temperature, T(g). Our findings support the fact that chain scission is the main reason for the decrease of Tg and Delta H* with the absorbed dose. At low doses, despite large changes in molecular weight, only small alterations are observed in the glass transition temperature and apparent activation energy. Further increase in the absorbed dose introduces not only significant changes in the molecular weight but also in the glass transition temperature and the activation energy. Such glass transition behaviour is a manifestation of a well-known effect of molecular weight on Tg, postulated by the Fox-Flory equation. However, all the observed alterations are small and tolerable at absorbed doses required for sterilization (up to 25 kGy in most circumstances). Furthermore, this study reveals that the radiation-induced changes in the molecular weight and the glass transition temperature occur in a predictable and fairly accurate manner. Therefore, gamma radiation can be used not only for sterilization but also for tailoring desirable end-use properties of PLLA based implants.",
journal = "Hemijska industrija",
title = "The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation",
volume = "64",
number = "4",
pages = "275-281",
doi = "10.2298/HEMIND100329020M"
}

Miličević, D. S., Trifunovic, S. B., Mudrinic, T. M., Leskovac, A., Ignjatović, N. L., Dojčilović, J. R.,& Suljovrujić, E. H.. (2010). The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation. in Hemijska industrija, 64(4), 275-281.
https://doi.org/10.2298/HEMIND100329020M

Miličević DS, Trifunovic SB, Mudrinic TM, Leskovac A, Ignjatović NL, Dojčilović JR, Suljovrujić EH. The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation. in Hemijska industrija. 2010;64(4):275-281.
doi:10.2298/HEMIND100329020M .

Miličević, Dejan S., Trifunovic, Sasa B., Mudrinic, Tihana M., Leskovac, Andreja, Ignjatović, Nenad L., Dojčilović, Jablan R., Suljovrujić, Edin H., "The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation" in Hemijska industrija, 64, no. 4 (2010):275-281,
https://doi.org/10.2298/HEMIND100329020M . .