Introduction of PEN and its intermediate 2,6-NDA

The development of polyethylene naphthalate(PEN) and its intermediate 2,6-naphthalene dicarboxylic aicd(2,6-NDA) is reviewed.The normal characteristics of PEN such as the better gas barrier performance,heat stability,good mechanical properties,optical characteristics,steady chemical properties and the application of PEN to bottle and film field were introduced.It was pointed out that the key factor that restrict the development of PEN was the production of its intermediate 2,6-naphthalene dicarboxylic acid(2,6-NDA).The preparation methods of 2,6-NDA were also introduced.