Thermal properties of extrusion and injection grade polylactic acid (PLA) were analysed using high pressure differential scanning calorimetry (HP-DSC) under CO2 pressures of up to 50 MPa. The greatest depression of melting point and degree of crystallinity of the samples occurred at 20–30 MPa (∼97–115 °C). Batch and semi-continuous processes for supercritical foaming and impregnation of PLA with thymol or thyme extract were performed at 30 MPa and 100–110 °C to prevent thymol degradation, decrease heating requirements and ease polymer processing. At these conditions, PLA foams containing 5.6% or 1.1% of thymol and 0.7% of thyme extract were obtained using static or dynamic batch impregnation and semi-continuous extraction-impregnation process for 7 h, respectively. DSC and HP-DSC analyses revealed more pronounced effect of scCO2 plasticizing than foaming on PLA crystallinity. Neat and impregnated PLA foams with pores size of 15-200 μm have potential for food packaging, biomedical and i...nsulation applications.
This is the peer-reviewed version of the following article: Kuska R, Milovanović S, Frerich S, Ivanović J. Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design. in Journal of Supercritical Fluids. 2019;144:71-80.
doi:10.1016/j.supflu.2018.10.008
TY - JOUR
AU - Kuska, Robert
AU - Milovanović, Stoja
AU - Frerich, Sulamith
AU - Ivanović, Jasna
PY - 2019
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5041
AB - Thermal properties of extrusion and injection grade polylactic acid (PLA) were analysed using high pressure differential scanning calorimetry (HP-DSC) under CO2 pressures of up to 50 MPa. The greatest depression of melting point and degree of crystallinity of the samples occurred at 20–30 MPa (∼97–115 °C). Batch and semi-continuous processes for supercritical foaming and impregnation of PLA with thymol or thyme extract were performed at 30 MPa and 100–110 °C to prevent thymol degradation, decrease heating requirements and ease polymer processing. At these conditions, PLA foams containing 5.6% or 1.1% of thymol and 0.7% of thyme extract were obtained using static or dynamic batch impregnation and semi-continuous extraction-impregnation process for 7 h, respectively. DSC and HP-DSC analyses revealed more pronounced effect of scCO2 plasticizing than foaming on PLA crystallinity. Neat and impregnated PLA foams with pores size of 15-200 μm have potential for food packaging, biomedical and insulation applications.
PB - Elsevier B.V.
T2 - Journal of Supercritical Fluids
T1 - Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design
EP - 80
SP - 71
VL - 144
DO - 10.1016/j.supflu.2018.10.008
ER -
@article{
author = "Kuska, Robert and Milovanović, Stoja and Frerich, Sulamith and Ivanović, Jasna",
year = "2019",
abstract = "Thermal properties of extrusion and injection grade polylactic acid (PLA) were analysed using high pressure differential scanning calorimetry (HP-DSC) under CO2 pressures of up to 50 MPa. The greatest depression of melting point and degree of crystallinity of the samples occurred at 20–30 MPa (∼97–115 °C). Batch and semi-continuous processes for supercritical foaming and impregnation of PLA with thymol or thyme extract were performed at 30 MPa and 100–110 °C to prevent thymol degradation, decrease heating requirements and ease polymer processing. At these conditions, PLA foams containing 5.6% or 1.1% of thymol and 0.7% of thyme extract were obtained using static or dynamic batch impregnation and semi-continuous extraction-impregnation process for 7 h, respectively. DSC and HP-DSC analyses revealed more pronounced effect of scCO2 plasticizing than foaming on PLA crystallinity. Neat and impregnated PLA foams with pores size of 15-200 μm have potential for food packaging, biomedical and insulation applications.",
publisher = "Elsevier B.V.",
journal = "Journal of Supercritical Fluids",
title = "Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design",
pages = "80-71",
volume = "144",
doi = "10.1016/j.supflu.2018.10.008"
}
Kuska, R., Milovanović, S., Frerich, S.,& Ivanović, J.. (2019). Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design. in Journal of Supercritical Fluids
Elsevier B.V.., 144, 71-80.
https://doi.org/10.1016/j.supflu.2018.10.008
Kuska R, Milovanović S, Frerich S, Ivanović J. Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design. in Journal of Supercritical Fluids. 2019;144:71-80.
doi:10.1016/j.supflu.2018.10.008 .
Kuska, Robert, Milovanović, Stoja, Frerich, Sulamith, Ivanović, Jasna, "Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design" in Journal of Supercritical Fluids, 144 (2019):71-80,
https://doi.org/10.1016/j.supflu.2018.10.008 . .
