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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Salicylic acid percent content in the sPS fibers, in PBS aqueous solution at 37 °C (A) and after subsequent washing cycles of 1 h with water at 65 °C (B) from different sPS fibers: (●) CC δ form; (●) γ form; (●) CC disordered δ form.