Effect of Biaxial Orientation on Microstructure and Properties of Renewable Copolyesters of Poly(ethylene terephthalate) with 2,5-Furandicarboxylic Acid for Packaging Application,ACS Applied Energy Materials

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Effect of Biaxial Orientation on Microstructure and Properties of Renewable Copolyesters of Poly(ethylene terephthalate) with 2,5-Furandicarboxylic Acid for Packaging Application
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-06-05 00:00:00 , DOI: 10.1021/acsapm.9b00330
Anup S. Joshi ₁ , Joseph G. Lawrence ₁ , Maria R. Coleman ₁

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The cost and availability of 2,5-furandicarboxylic acid (FDCA), a monomer for poly(ethylene 2,5-furandicarboxylate) (PEF), limit the use of PEF as a biobased alternative to poly(ethylene terephthalate) (PET) for packaging application. To avail the advantages exhibited by PEF, copolymerization of PET with small quantities of FDCA has been proposed. This work provides a first fundamental study of the effect of biaxial orientation, a critical microscopic phenomenon for packaging polymers, on the microstructure and properties of copolyesters of PET with FDCA (PETF). In the unoriented state, incorporation of randomly distributed furan units in the polyester backbone resulted in enhanced mechanical and barrier performance. However, upon biaxial orientation, the tendency of the PETF copolyesters to strain induce crystallize was affected significantly. Notably, even with a reduced level of crystallinity, the enhancement in the properties of the copolyesters remained consistent for oriented samples. Differential calorimetric studies (DSC) indicated that the rigid amorphous fraction (RAF) in oriented PETF samples increased possibly due to the exclusion of randomly distributed furan units from the crystals. This increase in the RAF and consequent enrichment of furan units in the mobile amorphous phase compensated for the reduced crystallinity of PETF copolyesters and retained the barrier enhancement observed in the unoriented state.

中文翻译：

双轴取向对用于包装的聚对苯二甲酸乙二醇酯与2,5-呋喃二甲酸可再生共聚酯的微观结构和性能的影响

2,5-呋喃二甲酸（FDCA）（用于聚2,5-呋喃二甲酸乙二醇酯（PEF）的单体）的成本和可用性限制了PEF作为聚对苯二甲酸乙二醇酯（PET）的生物替代品的用途。包装应用。为了利用PEF显示的优点，已经提出了PET与少量FDCA的共聚。这项工作为双轴取向（包装聚合物的关键微观现象）对PET与FDCA（PETF）共聚酯的微观结构和性能的影响提供了基础研究。在未取向状态下，在聚酯主链中掺入随机分布的呋喃单元会提高机械性能和阻隔性能。然而，在双轴取向时，PETF共聚酯应变诱导结晶的趋势受到显着影响。值得注意的是，即使结晶度降低，共聚酯性能的增强对于取向样品也保持一致。差示量热研究（DSC）表明，定向PETF样品中的刚性无定形分数（RAF）可能由于晶体中排除了随机分布的呋喃单元而增加。RAF的增加以及随之而来的流动性无定形相中呋喃单元的富集弥补了PETF共聚酯结晶性的降低，并保留了未取向状态下的阻隔增强作用。差示量热研究（DSC）表明，定向PETF样品中的刚性无定形分数（RAF）可能由于晶体中排除了随机分布的呋喃单元而增加。RAF的增加以及随之而来的流动性无定形相中呋喃单元的富集弥补了PETF共聚酯结晶度的降低，并保留了未取向状态下的阻隔增强作用。差示量热研究（DSC）表明，定向PETF样品中的刚性无定形分数（RAF）可能由于晶体中排除了随机分布的呋喃单元而增加。RAF的增加以及随之而来的流动性无定形相中呋喃单元的富集弥补了PETF共聚酯结晶性的降低，并保留了未取向状态下的阻隔增强作用。

更新日期：2019-06-05

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