Studying the photodegradation of ethylcellulose and methylcellulose in the presence and absence of benzophenone (BPh) . cbej [Internet]. 2022 Dec. 20 [cited 2025 Apr. 21];15(57):1-14. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/7989