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[en] Processing of thermoplastics can be facilitated by plasticizer, though after processing the plasticizer remains to modify the properties of the product. Investigation of the plasticizing action of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin for poly(trimethylene terephthalate) (PTT) using Fourier transform infrared spectroscopy, Raman spectroscopy and differential scanning calorimetry led to the introduction of a novel block co-polymer (DGEBA-block-PTT-block-DGEBA). The novel block co-polymer, formed by the reaction between the end groups of PTT and the oxirane ring of DGEBA, was dependent on the pH of the medium.