TY  - JOUR
AU  - Milovanović, Stoja
AU  - Lukić, Ivana
AU  - Horvat, Gabrijela
AU  - Novak, Zoran
AU  - Frerich, Sulamith
AU  - Petermann, Marcus
AU  - García-González, Carlos A.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6032
AB  - This review provides a concise overview of up-to-date developments in the processing of neat poly(lactic acid) (PLA), improvement in its properties, and preparation of advanced materials using a green medium (CO2 under elevated pressure). Pressurized CO2 in the dense and supercritical state is a superior alternative medium to organic solvents, as it is easily available, fully recyclable, has easily tunable properties, and can be completely removed from the final material without post-processing steps. This review summarizes the state of the art on PLA drying, impregnation, foaming, and particle generation by the employment of dense and supercritical CO2 for the development of new materials. An analysis of the effect of processing methods on the final material properties was focused on neat PLA and PLA with an addition of natural bioactive components. It was demonstrated that CO2-assisted processes enable the control of PLA properties, reduce operating times, and require less energy compared to conventional ones. The described environmentally friendly processing techniques and the versatility of PLA were employed for the preparation of foams, aerogels, scaffolds, microparticles, and nanoparticles, as well as bioactive materials. These PLA-based materials can find application in tissue engineering, drug delivery, active food packaging, compostable packaging, wastewater treatment, or thermal insulation, among others.
PB  - MDPI
T2  - Polymers
T1  - Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials: A Review (2012–2022)
IS  - 4
SP  - 860
VL  - 15
DO  - 10.3390/polym15040860
ER  - 

@article{
author = "Milovanović, Stoja and Lukić, Ivana and Horvat, Gabrijela and Novak, Zoran and Frerich, Sulamith and Petermann, Marcus and García-González, Carlos A.",
year = "2023",
abstract = "This review provides a concise overview of up-to-date developments in the processing of neat poly(lactic acid) (PLA), improvement in its properties, and preparation of advanced materials using a green medium (CO2 under elevated pressure). Pressurized CO2 in the dense and supercritical state is a superior alternative medium to organic solvents, as it is easily available, fully recyclable, has easily tunable properties, and can be completely removed from the final material without post-processing steps. This review summarizes the state of the art on PLA drying, impregnation, foaming, and particle generation by the employment of dense and supercritical CO2 for the development of new materials. An analysis of the effect of processing methods on the final material properties was focused on neat PLA and PLA with an addition of natural bioactive components. It was demonstrated that CO2-assisted processes enable the control of PLA properties, reduce operating times, and require less energy compared to conventional ones. The described environmentally friendly processing techniques and the versatility of PLA were employed for the preparation of foams, aerogels, scaffolds, microparticles, and nanoparticles, as well as bioactive materials. These PLA-based materials can find application in tissue engineering, drug delivery, active food packaging, compostable packaging, wastewater treatment, or thermal insulation, among others.",
publisher = "MDPI",
journal = "Polymers",
title = "Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials: A Review (2012–2022)",
number = "4",
pages = "860",
volume = "15",
doi = "10.3390/polym15040860"
}

Milovanović, S., Lukić, I., Horvat, G., Novak, Z., Frerich, S., Petermann, M.,& García-González, C. A.. (2023). Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials: A Review (2012–2022). in Polymers
MDPI., 15(4), 860.
https://doi.org/10.3390/polym15040860

Milovanović S, Lukić I, Horvat G, Novak Z, Frerich S, Petermann M, García-González CA. Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials: A Review (2012–2022). in Polymers. 2023;15(4):860.
doi:10.3390/polym15040860 .

Milovanović, Stoja, Lukić, Ivana, Horvat, Gabrijela, Novak, Zoran, Frerich, Sulamith, Petermann, Marcus, García-González, Carlos A., "Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials: A Review (2012–2022)" in Polymers, 15, no. 4 (2023):860,
https://doi.org/10.3390/polym15040860 . .

TY  - CONF
AU  - Milovanović, Stoja
AU  - Pantić, Milica
AU  - Pavlović, Stefan M.
AU  - Novak, Zoran
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6903
AB  - Polylactide (PLA) is a versatile polymer with a variety of applications from consumer goods (e.g. disposable cutlery, food, and beverage packaging) to medical (e.g. disposable protective garments, implants), agriculture (e.g. mulch films), etc [1]. However, its use as porous materials is still limited [2]. In order to increase possible PLA-based material applications, the present work was focused on the preparation of PLA aerogels with defined morphology. For
this purpose, three polymer solvents were tested (chloroform, dichloromethane, and dioxane). PLA solutions, prepared at room temperature, were immersed in antisolvent (absolute ethanol) for solvent replacement prior to drying. Obtained alcogels were dried using supercritical CO
2 at 150 bar and 35 °C in a combination of static and dynamic regimes up to 3 h [3] for aerogel production. While chloroform and dichloromethane enabled the production of stable material, the use of dioxane as a solvent led to the formation of aerogels that were crumbling during retrieving from a high-pressure drying unit. Stable aerogels were further characterized using scanning electron microscopy, water displacement method, mercury intrusion porosimetry, gas adsorption-desorption analysis as well as Fourier transform infrared spectroscopy and thermogravimetry combined with differential scanning calorimetry. After the selection of optimal solvent, two temperatures for solvent replacement with anti-solvent ethanol were compared (-20 and 22 °C). Results showed that both solvent selection as well as temperature for solvent replacement have a significant effect on the morphology of PLA aerogels. The density of aerogels ranged from 0.34 to 0.47 g/cm3 while its porosity ranged from 62.6 to 73.0% [3].
C3  - 2nd International Conference on Aerogels for Biomedical and Environmental Applications (AERoGELS2022), 29 June–1 July 2022, Athens, Greece
T1  - Influence of solvent selection and temperature for solvent replacement on the morphology of PLA aerogels
SP  - P-24
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6903
ER  - 

@conference{
author = "Milovanović, Stoja and Pantić, Milica and Pavlović, Stefan M. and Novak, Zoran",
year = "2022",
abstract = "Polylactide (PLA) is a versatile polymer with a variety of applications from consumer goods (e.g. disposable cutlery, food, and beverage packaging) to medical (e.g. disposable protective garments, implants), agriculture (e.g. mulch films), etc [1]. However, its use as porous materials is still limited [2]. In order to increase possible PLA-based material applications, the present work was focused on the preparation of PLA aerogels with defined morphology. For
this purpose, three polymer solvents were tested (chloroform, dichloromethane, and dioxane). PLA solutions, prepared at room temperature, were immersed in antisolvent (absolute ethanol) for solvent replacement prior to drying. Obtained alcogels were dried using supercritical CO
2 at 150 bar and 35 °C in a combination of static and dynamic regimes up to 3 h [3] for aerogel production. While chloroform and dichloromethane enabled the production of stable material, the use of dioxane as a solvent led to the formation of aerogels that were crumbling during retrieving from a high-pressure drying unit. Stable aerogels were further characterized using scanning electron microscopy, water displacement method, mercury intrusion porosimetry, gas adsorption-desorption analysis as well as Fourier transform infrared spectroscopy and thermogravimetry combined with differential scanning calorimetry. After the selection of optimal solvent, two temperatures for solvent replacement with anti-solvent ethanol were compared (-20 and 22 °C). Results showed that both solvent selection as well as temperature for solvent replacement have a significant effect on the morphology of PLA aerogels. The density of aerogels ranged from 0.34 to 0.47 g/cm3 while its porosity ranged from 62.6 to 73.0% [3].",
journal = "2nd International Conference on Aerogels for Biomedical and Environmental Applications (AERoGELS2022), 29 June–1 July 2022, Athens, Greece",
title = "Influence of solvent selection and temperature for solvent replacement on the morphology of PLA aerogels",
pages = "P-24",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6903"
}

Milovanović, S., Pantić, M., Pavlović, S. M.,& Novak, Z.. (2022). Influence of solvent selection and temperature for solvent replacement on the morphology of PLA aerogels. in 2nd International Conference on Aerogels for Biomedical and Environmental Applications (AERoGELS2022), 29 June–1 July 2022, Athens, Greece, P-24.
https://hdl.handle.net/21.15107/rcub_technorep_6903

Milovanović S, Pantić M, Pavlović SM, Novak Z. Influence of solvent selection and temperature for solvent replacement on the morphology of PLA aerogels. in 2nd International Conference on Aerogels for Biomedical and Environmental Applications (AERoGELS2022), 29 June–1 July 2022, Athens, Greece. 2022;:P-24.
https://hdl.handle.net/21.15107/rcub_technorep_6903 .

Milovanović, Stoja, Pantić, Milica, Pavlović, Stefan M., Novak, Zoran, "Influence of solvent selection and temperature for solvent replacement on the morphology of PLA aerogels" in 2nd International Conference on Aerogels for Biomedical and Environmental Applications (AERoGELS2022), 29 June–1 July 2022, Athens, Greece (2022):P-24,
https://hdl.handle.net/21.15107/rcub_technorep_6903 .

TY  - JOUR
AU  - Milovanović, Stoja
AU  - Marković, Darka
AU  - Pantic, Milica
AU  - Pavlovic, Stefan M.
AU  - Knapczyk-Korczak, Joanna
AU  - Stachewicz, Urszula
AU  - Novak, Zoran
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4786
AB  - The release of industrial wastewater into the ecosystem prompted our research on the development of an efficient and biodegradable material that can be used for wastewater treatment. We optimized preparation of porous material from poly(lactic acid) (PLA) by variation in solvents and drying methods (air-drying vs. supercritical CO2-drying). In addition, we optimized the method of TiO2 nanoparticles immobilization (in situ vs. ex situ) onto porous PLA. The material properties and functionality were verified by SEM, water displacement, gas adsorption desorption, Hg-intrusion porosimetry, dye degradation, FTIR, TGA/DSC, and water contact angle analysis. We showed that the morphology of PLA material could be controlled by variation in process parameters resulting in porosity from 43% to 73%. The prepared material sustained floatability for longer than 4 weeks and provided complete discoloration of dye C.I. Acid Orange 7 after 240 min of illumination. The high photocatalytic activity was preserved within three repeated cycles.
T2  - Journal of Supercritical Fluids
T1  - Development of advanced floating poly(lactic acid)-based materials for colored wastewater treatment
VL  - 177
DO  - 10.1016/j.supflu.2021.105328
ER  - 

@article{
author = "Milovanović, Stoja and Marković, Darka and Pantic, Milica and Pavlovic, Stefan M. and Knapczyk-Korczak, Joanna and Stachewicz, Urszula and Novak, Zoran",
year = "2021",
abstract = "The release of industrial wastewater into the ecosystem prompted our research on the development of an efficient and biodegradable material that can be used for wastewater treatment. We optimized preparation of porous material from poly(lactic acid) (PLA) by variation in solvents and drying methods (air-drying vs. supercritical CO2-drying). In addition, we optimized the method of TiO2 nanoparticles immobilization (in situ vs. ex situ) onto porous PLA. The material properties and functionality were verified by SEM, water displacement, gas adsorption desorption, Hg-intrusion porosimetry, dye degradation, FTIR, TGA/DSC, and water contact angle analysis. We showed that the morphology of PLA material could be controlled by variation in process parameters resulting in porosity from 43% to 73%. The prepared material sustained floatability for longer than 4 weeks and provided complete discoloration of dye C.I. Acid Orange 7 after 240 min of illumination. The high photocatalytic activity was preserved within three repeated cycles.",
journal = "Journal of Supercritical Fluids",
title = "Development of advanced floating poly(lactic acid)-based materials for colored wastewater treatment",
volume = "177",
doi = "10.1016/j.supflu.2021.105328"
}

Milovanović, S., Marković, D., Pantic, M., Pavlovic, S. M., Knapczyk-Korczak, J., Stachewicz, U.,& Novak, Z.. (2021). Development of advanced floating poly(lactic acid)-based materials for colored wastewater treatment. in Journal of Supercritical Fluids, 177.
https://doi.org/10.1016/j.supflu.2021.105328

Milovanović S, Marković D, Pantic M, Pavlovic SM, Knapczyk-Korczak J, Stachewicz U, Novak Z. Development of advanced floating poly(lactic acid)-based materials for colored wastewater treatment. in Journal of Supercritical Fluids. 2021;177.
doi:10.1016/j.supflu.2021.105328 .

Milovanović, Stoja, Marković, Darka, Pantic, Milica, Pavlovic, Stefan M., Knapczyk-Korczak, Joanna, Stachewicz, Urszula, Novak, Zoran, "Development of advanced floating poly(lactic acid)-based materials for colored wastewater treatment" in Journal of Supercritical Fluids, 177 (2021),
https://doi.org/10.1016/j.supflu.2021.105328 . .