The effect of ionomer styrene-sodium acrylate(SAA-Na) on the crystallization and melting behaviors of polyethylene terephthalate(PET) was investigated by using differential scanning calorimetry(DSC).

Polyethylene terephthalate (PET) films were polymerized in solid phase, the molecular weight, molecular weight distribution (MWD) and cyclic oligomer content of the products were determined by GPC.

By analysis of the production of polyethylene terephthalate (PET), the adjustment and effect of esterification process using purified terephthalic acid (PTA) purchased outside were discussed.