Effect of the Addition of MgO Nanoparticles on the Thermally-Activated Shape Memory Behavior of Plasticized PLA Electrospun Fibers

Autor: Laura Peponi, Marcela Lieblich Rodriguez, Stefano Fiori, ADRIAN LUIS LEONES GIL
Přispěvatelé: Ministerio de Ciencia e Innovación (España)
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Polymers; Volume 14; Issue 13; Pages: 2657
Digital.CSIC. Repositorio Institucional del CSIC
instname
ISSN: 2073-4360
DOI: 10.3390/polym14132657
Popis: In this work, the thermally-activated shape memory behavior of poly(lactic acid)-based electrospun fibers (PLA-based efibers) reinforced with different amounts of magnesium oxide (MgO) nanoparticles (NPs) was studied at different temperatures. In particular, MgO NPs were added at different concentrations, such as 0.1, 0.5, 1 and 3 wt%, with respect to the PLA matrix. The glass-transition temperature of PLA-based efibers was modulated by adding a 20 wt% of oligomer lactic acid as plasticizer. Once the plasticized PLA-based efibers were obtained and basically characterized in term of morphology as well as thermal and mechanical properties, thermo-mechanical cycles were carried out at 60 °C and 45 °C in order to study their thermally-activated shape memory response, demonstrating that their crystalline nature strongly affects their shape memory behavior. Importantly, we found that the plastificant effect in the mechanical response of the reinforced plasticized PLA efibers is balanced with the reinforcing effect of the MgO NPs, obtaining the same mechanical response of neat PLA fibers. Finally, both the strain recovery and strain fixity ratios of each of the plasticized PLA-based efibers were calculated, obtaining excellent thermally-activated shape memory response at 45 °C, demonstrating that 1 wt% MgO nanoparticles was the best concentration for the plasticized system.
Financial support of the Spanish Ministry of Science and Innovation (MICINN) through PID2019-104351GB-C21 and PID2021-123753NB-C31 is greatly acknowledge
Databáze: OpenAIRE
Nepřihlášeným uživatelům se plný text nezobrazuje