9Wang C S, Sun Y M. Studies on the formation of PEN. I. Kinetic aspects of catalysed reaction in transestcrification of dimethylnaphthalate with ethylene glycol Journal of polymer science[J]. Part A, Polymer Chemistry, 1994, 32 (1): 1 295-1 304.
10Song C, Schobert H H. Opportunities for developing specialty chemicals and advanced materials from coals [J]. Fuel Processing Technology, 1993, 34 (2): 157-196.