MOHAMMED, E.; NASHWAN, M.; ABDALKARIM, A.; AL-NAQEED, S.; AL-AREQI, N. A. S.; ALARIQI, S. A. S. Valorization of Spent Engine Oil as a Sustainable Polyol Substituent in Flexible Polyurethane Foam Synthesis: A Comparative Study of Starch and Natural Zeolite Filler Systems. مجـلـة جـامـعـة السـعيد للعلـوم التطبيقية, [S. l.], v. 9, n. 2, p. 33–51, 2026. DOI: 10.59325/sjas.v9i2.330. Disponível em: https://journal.alsaeeduni.edu.ye/index.php/SJAS/article/view/330. Acesso em: 8 2026.