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学者姓名：刘雪莲
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Abstract ：
In this article, several novel polyesters containing renewable 2,6-pyridinedicarboxyl aromatic units are synthesized by direct polycondensation. The obtained polyesters are chemically identified by Fourier transform infrared and proton nuclear magnetic resonance. Their average weight molar masses vary with the diol chain length, from Mw = 2 600 gmol-1 to Mw = 51 600 gmol-1. These polyesters exhibit high thermal stability with thermaldegradation temperatures (Tmax) ranging from 330 to 399 degrees C. Among them, the polyesters containing bicyclic diols (isosorbide IS and isomannide IM) are amorphous and show glass transition temperatures (Tg) up to 163 degrees C and 176 degrees C respectively. Besides, polyesters containing linear diols are semi-crystalline with melting temperatures (Tm) ranging from 110 to 189 degrees C. The semi-crystalline nature is verified by X-ray diffraction and polarized optical microscopy. These results disclose that 2,6-pyridinedicarboxylic acid (PDA26) is attractive as a bio-occuring molecule for preparing both high Tg and semi-crystalline polymers when finely choosing the diols.
Keyword ：
biopolymers biopolymers Dipicolinic acid Dipicolinic acid high Tg high Tg polyesters polyesters semi-crystalline semi-crystalline
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| GB/T 7714 | Liu, Xuelian , Lebrun, Laurent , Fatyeyeva, Kateryna et al. Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties [J]. | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY , 2024 . |
| MLA | Liu, Xuelian et al. "Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties" . | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY (2024) . |
| APA | Liu, Xuelian , Lebrun, Laurent , Fatyeyeva, Kateryna , Desilles, Nicolas . Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties . | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY , 2024 . |
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Abstract ：
Driven by sustainable development and low-carbon policies, many high-performance bio-based polyesters are produced. Our previous work uncovered the high barrier but low thermal and mechanical properties of a renewable 2,6-pyridinedicarboxylic-based polyester. In this article, the copolymerization with isosorbide as a second diol is considered to ameliorate these properties. The chemical structures of copolyesters and the successful introduction of isosorbide were confirmed by FT-IR and 1H NMR. The 1H NMR spectra also allowed the calculation of isosorbide ratio in polymers. GPC revealed a decrease in molar masses with the increase of isosorbide ratio. Contact angle and water/gas permeation measurements disclosed an increase in hydrophilicity and water/gas permeability with the introduction of isosorbide. TGA and DSC analyses demonstrated an enhancement in thermal stability: 8 mol% of isosorbide to the total diol ratio increased the 5 % weight loss temperature (T5%) by 9 degrees C, the maximum weight loss temperature (Tmax) by 8 degrees C and the glass transition temperature (Tg) by 6 degrees C. DSC investigation showed that the incorporation of isosorbide significantly influenced the crystallization properties, particularly from the melt, by decreasing the crystallinity. XRD patterns indicated the presence of similar crystallization units in these polyesters. Tensile test revealed that incorporating 8 mol% of isosorbide greatly improved the mechanical properties by doubling Young's modulus and tripling the strength at break. Such enhancement in thermal and mechanical properties is important for high gas barrier food packaging applications of these polyesters.
Keyword ：
Bio-based copolyesters Bio-based copolyesters Isosorbide Isosorbide Mechanical properties Mechanical properties Permeation properties Permeation properties Structure -property relationships Structure -property relationships Thermal properties Thermal properties
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| GB/T 7714 | Liu, Xuelian , Lebrun, Laurent , Desilles, Nicolas . Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications [J]. | EUROPEAN POLYMER JOURNAL , 2023 , 202 . |
| MLA | Liu, Xuelian et al. "Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications" . | EUROPEAN POLYMER JOURNAL 202 (2023) . |
| APA | Liu, Xuelian , Lebrun, Laurent , Desilles, Nicolas . Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications . | EUROPEAN POLYMER JOURNAL , 2023 , 202 . |
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