REVERSIBLE PLASTICIZATION OF THE AROMATIC COPOLYESTER OF POLY(ETHYLENE TEREPHTHALATE) AND 60 MOLE % p-ACETOXYBENZOIC ACID AND WITH 1,1,1,3,3,3 HEXAFLUORO-2-PROPANOL.H.H. ShihL.E. Hornbergeret al.1984ACS National Meeting 1984