Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design

Kuska, Robert; Milovanović, Stoja; Frerich, Sulamith; Ivanović, Jasna

doi:10.1016/j.supflu.2018.10.008

Cited by 51 publications

(47 citation statements)

References 61 publications

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“…The M w value of sample P was about 209,900 Da, which corresponds to the literature value of the PLA type used [35,36,37]. Addition of the reference anti-aging compound (BHT) resulted in a decrease in the M w value for sample R to 177,900 Da.…”

Section: Resultssupporting

confidence: 63%

Composting of Polylactide Containing Natural Anti-Aging Compounds of Plant Origin

et al. 2019

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The paper presents the effects of biodegradation of polylactide containing natural anti-aging compounds. Polymer containing 0.5; 5 and 10 wt % of coffee, cocoa or cinnamon extracts were subjected to industrial composting for 7, 14, 21 or 28 days. The effect of the composting process on polylactide properties was examined based on visual assessment, scanning electron microscopy, average molecular weight, differential scanning calorimetry, thermogravimetry, and tensile strength. The impact of the tested extracts on the effects of the composting process was compared with the impact of a commercially available anti-aging compound. It was found that the tested extracts in most cases did not adversely affect the effects of the composting process compared to pure polylactide, often resulting in intensification of biodegradation processes. As a result of the composting process, changes in the macro- and microscopic appearance of the samples and a decrease in molecular weight, phase transition temperatures, thermal resistance, and thermal strength were observed on a scale close to or greater than the reference anti-aging compound.

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Section: Resultssupporting

confidence: 63%

Composting of Polylactide Containing Natural Anti-Aging Compounds of Plant Origin

et al. 2019

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“…The absorbed carbon dioxide exerts a plasticizing effect on the polymer that is even more pronounced when the temperature rises over the polymer vitreous transition temperature, where the polymer is in an amorphous state [ 38 ]. At the same time, as the concentration of the fluid inside the polymer increases, its vitreous transition temperature, together with its melting temperature and melt viscosity, significantly decrease [ 39 ]. It should be noted at this point that the large swelling and structural deformation observed in the polymer samples that were subjected to the most extreme conditions within the studied range (400 bar and 75 °C) are a consequence of both effects: plasticization, and the resulting reduction in its melting temperature.…”

Section: Discussionmentioning

confidence: 99%

Supercritical Impregnation of Ketoprofen into Polylactic Acid for Biomedical Application: Analysis and Modeling of the Release Kinetic

et al. 2021

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Ketoprofen (KET) is an anti-inflammatory drug often used in medicine due to its analgesic and antipyretic effects. If it is administered in a controlled form by means of different dosing devices, it acts throughout the patient’s recovery period improving its efficacy. This study intends to support the use of supercritical solvent impregnation (SSI) as an efficient technique to develop polylactic acid (PLA) functionalized with ketoprofen, for use as controlled drug release devices. For this purpose, firstly, the influence of different SSI variables on the desirable swelling of the polymer structure, while avoiding their foaming, were evaluated. Then, the resulting ketoprofen loading was evaluated under different pressure/temperature conditions. It was generally found that as pressure and temperature are higher, the drug impregnation loads also increase. The maximum impregnation loads (at about 9% KET/PLA) were obtained at 200 bar and 75 °C. In vitro drug release tests of the impregnated compound were also carried out, and it was found that drug release profiles were also dependent on the specific pressure and temperature conditions used for the impregnation of each polymer filament.

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“…As a result of nucleation, the number of cells increases, and the diameter of the cell hole expands. Thus, the cell can grow [62,63].…”

Section: Polymer Foaming and Processingmentioning

confidence: 99%

Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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Polymer foams have low density, good heat insulation, good sound insulation effects, high specific strength, and high corrosion resistance, and are widely used in civil and industrial applications. In this paper, the classification of polymer foams, principles of the foaming process, types of blowing agents, and raw materials of polymer foams are reviewed. The research progress of various foaming methods and the current problems and possible solutions are discussed in detail.

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Thermal analysis of polylactic acid under high CO2 pressure applied in supercritical impregnation and foaming process design

Cited by 51 publications

References 61 publications

Composting of Polylactide Containing Natural Anti-Aging Compounds of Plant Origin

Composting of Polylactide Containing Natural Anti-Aging Compounds of Plant Origin

Supercritical Impregnation of Ketoprofen into Polylactic Acid for Biomedical Application: Analysis and Modeling of the Release Kinetic

Recent Trends of Foaming in Polymer Processing: A Review

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