@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 (similar to 97-115 degrees 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 degrees 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 scCO(2) plasticizing than foaming on PLA crystallinity. Neat and impregnated PLA foams with pores size of 15-200 pm have potential for food packaging, biomedical and insulation applications.",
publisher = "Elsevier Science Bv, Amsterdam",
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"
}