Effect of Alkali Lignin on Heat of Fusion, Crystallinity and melting points of Low density polyethylene(LDPE), Meduim density polyethylene(MDPE) and High density polyethylene(HDPE). (2010). University of Thi-Qar Journal of Science, 2(2), 89-95. http://mail.jsci.utq.edu.iq/index.php/main/article/view/354