Mohammed E, Nashwan M, Abdalkarim A, Al-Naqeed S, Al-Areqi NAS, Alariqi SAS. 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. SJAS [Internet]. 2026 Sep. 3 [cited 2026 Nov. 11];9(2):33-51. Available from: https://journal.alsaeeduni.edu.ye/index.php/SJAS/article/view/330