Microstructure and Thermal Characteristics of Bio-based Terpolymer Made from Terephthalic Acid with Ethylene Glycol, 1,4-Cyclohexane Dimethanol, and Isosorbide

Abstract

Characterization of a series of bio-based terpolymers containing various amounts of ethylene glycol, 1,4-cyclohexylene dimethanol, and isosorbide units were studied by 1 H NMR and 13 C NMR. The NMR results revealed that they had all random microstructures and that their sequence distribution was affected by the content of isosorbide. From DSC data for the terpolymer series investigated, it was observed that the glass transition temperature increased mainly as the content of isosorbide increased. The glass transition temperatures of terpolymers were estimated from the composition by extended Fox equation.Keywords: NMR, terpolymer, isosorbide, sequence, randomness. 실 험재료. 다양한 함량의 테레프탈산(terephthalic acid, TPA), 이 소소바이드(isosorbide, ISB), 에틸렌 글리콜(ethylene glycol, †