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Polylactic acid (PLA) is a bio‐based and biodegradable polymer. It is challenging to prepare PLA bead foams at a large scale in an efficient manner. Herein, beads of modified PLA are foamed by one‐step anhydrous supercritical CO2 extrusion. This dramatically shortens the production time, prevents the PLA from pyrohydrolysis, and avoids wastewater generation. The melt strength of the PLA is increased...
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