Preparation of amorphous poly(ethylene terephthalate) from U-Polymer via acopolymerization process

U-Polymer, a kind of polyarylate, was synthesized by interfacial polyconden sation method with terephthaloyl chloride (TPC), isophthaloyl chloride (IPC ), and bisphenol A (BPA) as raw materials. The structure of the U-Polymer w as characterized by IR and H-1-NMR spectra. Then, an amorphous poly(ethylen e terephthalate) (APET) was prepared with the introduction of the U-Polymer to the PET sequence to improve thermal and mechanical behaviors of PET via the polymerization process. The structure and property of the APET were ch aracterized by DSC and DMA. The results showed that the APET exhibits amorp hism, transparency, higher glass-transition temperature (T-g), and higher s torage modulus than that of PET. (C) 2001 John Wiley & Sons, Inc.