Work

Evaluation of critical process parameter on the production of sustainable bead foams based on polylactic acid

Year: 2024

Type: article

Abstract: A commercial grade of polylactic acid (PLA) was foamed without using modifiers to obtain expanded polylactic acid bead foams (EPLA). Typically, the foaming process is influenced by both melt properties and crystallization behavior. While factors like water temperature, die structure, and die temperature are known to have effects on bead foam processing, these aspects have not been thoroughly explored in the context of PLA bead foam production. To address this gap, a comprehensive investigation was undertaken, varying water temperature, die structure, and die temperature to discern their impact on PLA processing behavior. Results revealed that water temperature significantly influenced foaming behavior, particularly at elevated temperatures near the glass transition of PLA. Additionally, the study demonstrated that die size wielded a notable influence on all foam properties, dictating process limits. With the selection of an appropriate die size, the die temperature could be manipulated within the range of 190°C to 160°C, revealing a substantial impact on the overall process. Remarkably, the lowest densities achieved were 63 kg/m 3 with an average cell size of 36 µm and a cell density of 1.1*10 7 cells per cm 3 .

Source: Journal of Cellular Plastics

DOI: 10.1177/0021955x241281672

Authors: Christian Brütting, Sarah Klotz, Holger Ruckdäschel

Institutions: University of Bayreuth, Bavarian Polymer Institute

Language: English

Topic: Polymer Foaming and Composites

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $4,200