Improvement of mechanical properties of polyvinyl alcohol by addition of biomaterial (Okra shell and peel peas) for production of environmentally friendly products. mesop. environ. j [Internet]. 2022 Mar. 5 [cited 2025 Apr. 4];2(4):1-8. Available from: https://mej.uobabylon.edu.iq/index.php/mej/article/view/98