Sustainable terpolyester of high T g based on bio heterocyclic monomer of dimethyl furan-2,5-dicarboxylate and isosorbide
| Autor: | Sung Yeon Hwang, Mi Hee Ryu, Jun Mo Koo, Tae-Ho Kim, Seon-Mi Kim, Dongyeop X. Oh, Hyeonyeol Jeon, Seul-A Park, Jeyoung Park |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Steric effects
Isosorbide Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology Transesterification 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oligomer Copolyester 0104 chemical sciences chemistry.chemical_compound Monomer chemistry Polymerization Polymer chemistry Materials Chemistry medicine 0210 nano-technology Ethylene glycol medicine.drug |
| Zdroj: | Polymer. 132:122-132 |
| ISSN: | 0032-3861 |
| Popis: | Sustainable biobased terpolyester based on heterocyclic dimethyl furan-2,5-dicarboxylate and isosorbide in combination with ethylene glycol and 1,4-cyclohexanedimethylene (PEICF) were successfully synthesized by two-step melt polymerization method and characterized. A series of PEICF terpolyester exhibited excellent heat resistive properties, with glass transition temperatures of 81–119 °C, and high molecular weights (Mw = 50,800 g mol−1). When esterification was carried out at fixed a COOH:OH molar ratio of 1:2, 1,4-cyclohexanedimethanol (CHDM) showed increased reactivity compared to isosorbide (ISB) and ethylene glycol (EG) monomers. As a result, EG was most likely to be placed at the end of the oligomer chains, which accelerated the transesterification process and drastically increased chain growth via chain scission at the carbonyl carbon adjacent to the ethylene unit due to steric hindrance. The zero shear viscosities of the PEICF terpolyester were much higher than that of the copolyester and increased with increasing ISB content. This study proposed a method for improving the low reactivity of dimethyl furan-2,5-dicarboxylate, which shows suppressed furan ring flipping, with sterically hindered ISB by using highly reactive CHDM at atmospheric pressure. These results signify the importance of controlling the synthetic conditions, as they affect the composition of the polymer backbone due to the different reactivities, volatilities, and steric hindrances of the monomers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect