Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, Epiciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Blending and foaming thermoplastic starch with poly (lactic acid) by CO 2 ‐aided hot melt extrusion

Abstract : Biomaterials are materials that can be biodegradable or obtained from renewable resources. Among them, poly (lactic acid) (PLA) and thermoplastic starch (TPS) represent an interesting alternative to replace petro‐sourced thermoplastics. In this study, blends made by TPS addition to PLA were subjected to a foaming process using supercritical CO2‐aided extrusion. Extruder die temperature and CO2 content were the most prominent parameters explaining the structure of the foams obtained. Both parameters were intimately linked since the CO2 flow depends on the melt temperature, the lower the temperature, the higher the CO2 solubility. Therefore, the die temperature was chosen to pilot the process. Whatever the experimental conditions, a 50/50 (in wt%) blend was poorly foamed due to the strong incompatibility between both biopolymers. However, the blend made of 80 wt% PLA and 20 wt% TPS gave evenly foamed samples. In terms of expansion and type of porosity this blend behaved like pure PLA with high porosity, up to 96%, and the presence of a threshold die temperature separating a close cell porosity at lowest temperatures and an open cell structure above the threshold. This temperature threshold was however significantly lower to that obtained with pure PLA.
Complete list of metadata
Contributor : IMT Mines Albi IMT Mines Albi Connect in order to contact the contributor
Submitted on : Monday, November 16, 2020 - 4:06:38 PM
Last modification on : Wednesday, June 22, 2022 - 4:08:40 PM
Long-term archiving on: : Wednesday, February 17, 2021 - 7:31:06 PM


Files produced by the author(s)



Margot Chauvet, Martial Sauceau, Fabien Baillon, Jacques Fages. Blending and foaming thermoplastic starch with poly (lactic acid) by CO 2 ‐aided hot melt extrusion. Journal of Applied Polymer Science, Wiley, 2021, 138 (14), pp.1-12/50150. ⟨10.1002/app.50150⟩. ⟨hal-02983320⟩



Record views


Files downloads