Novel biobased copolyesters based on 1,2-propanediol or 2,3-butanediol with the same ethylene skeletal structure as PETG

Novel biobased copolyesters based on 1,2-propanediol or 2,3-butanediol with the same ethylene... New potentially biobased copolyesters having the same ethylene skeletal structure as poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) were synthesized based on 1,2-propanediol (1,2-PD) or 2,3-butanediol (2,3-BD) with 1,4-cyclohexane dimethanol (CHDM). The compositions of each copolyester were confirmed using 1H-NMR spectroscopy, and the detailed structure was analyzed using 2D NMR spectroscopy. In order to observe the effect of the lateral methyl groups on the microstructure and randomness in the sequences of the copolymers, 13C-NMR spectroscopy analysis was performed. The thermal properties, mechanical properties, and crystallinity of the copolyesters were analyzed using differential scanning calorimetry, thermogravimetric analysis, universal testing machine, and wide-angle X-ray diffraction. Depending on the number of the lateral methyl groups and the contents of the ethylene diol units, the copolyesters displayed different densities, glass transition temperatures (Tg), degrees of randomness and mechanical properties; however, a notable difference was not observed in thermal stability or crystallinity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Elsevier

Novel biobased copolyesters based on 1,2-propanediol or 2,3-butanediol with the same ethylene skeletal structure as PETG

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0032-3861
D.O.I.
10.1016/j.polymer.2017.12.024
Publisher site
See Article on Publisher Site

Abstract

New potentially biobased copolyesters having the same ethylene skeletal structure as poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) were synthesized based on 1,2-propanediol (1,2-PD) or 2,3-butanediol (2,3-BD) with 1,4-cyclohexane dimethanol (CHDM). The compositions of each copolyester were confirmed using 1H-NMR spectroscopy, and the detailed structure was analyzed using 2D NMR spectroscopy. In order to observe the effect of the lateral methyl groups on the microstructure and randomness in the sequences of the copolymers, 13C-NMR spectroscopy analysis was performed. The thermal properties, mechanical properties, and crystallinity of the copolyesters were analyzed using differential scanning calorimetry, thermogravimetric analysis, universal testing machine, and wide-angle X-ray diffraction. Depending on the number of the lateral methyl groups and the contents of the ethylene diol units, the copolyesters displayed different densities, glass transition temperatures (Tg), degrees of randomness and mechanical properties; however, a notable difference was not observed in thermal stability or crystallinity.

Journal

PolymerElsevier

Published: Jan 17, 2018

References

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