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Screening of Different Organocatalysts for the Sustainable Synthesis of PET
European Polymer Journal ( IF 6 ) Pub Date : 2018-04-27
I. Flores, J. Demarteau, A.J. Müller, A. Etxeberria, L. Irusta, F. Bergman, C. Koning, H. Sardon

Industrially, poly(ethylene terephthalate) (PET) is produced using organometallic catalysts which have shown excellent ability to promote the polymerization at elevated temperatures. However, the catalysts remain permanently in the fabricated item because their removal is very difficult both from a technical and economical point of view. In this work, several organocatalysts have been evaluated as alternative to the industrially applied organometallic catalysts for the bulk polymerization of PET from dimethyl terephthalate (DMT) and ethylene glycol (EG) at high temperatures. The effectiveness of the organic catalysts in PET synthesis is evaluated by SEC, DSC, TGA, 1H NMR and FTIR spectroscopy. After screening various organocatalyst families, our results demonstrate that the catalytic activity of 1,8-Diazabicyclo[5.4.0]undec-7-ene: benzoic acid salt (DBU:BA) is competitive in comparison with the conventional organometallic-based catalyst employed in PET synthesis. This ionic salt combines the excellent catalytic ability of organic compounds with the thermal stability of metal-based catalysts, resisting degradation up to > 250 ˚C which is close to the industrial polymerization temperature of PET. Moreover, the dimerization degree of ethyleneglycol in the presence of DBU:BA is significantly reduced in comparison to organometallic catalysts which enhances the thermal properties of the synthesized PET using DBU:BA. Thus, organic salts have shown to be promising catalyst for the bulk polymerization of PET and in addition may be a viable option to obtain metal-free PET.



中文翻译:

筛选可持续合成PET的不同有机催化剂

在工业上,聚对苯二甲酸乙二醇酯(PET)是使用有机金属催化剂生产的,该有机金属催化剂在高温下具有出色的促进聚合反应的能力。然而,由于从技术和经济的观点来看,去除它们都是非常困难的,因此催化剂永久保留在制成品中。在这项工作中,已经评估了几种有机催化剂,作为工业上应用的有机金属催化剂的替代品,用于在高温下由对苯二甲酸二甲酯(DMT)和乙二醇(EG)本体聚合PET。有机催化剂在PET合成中的有效性通过SEC,DSC,TGA,1进行了评估1 H NMR和FTIR光谱。在筛选了各种有机催化剂家族之后,我们的结果表明,1,8-二氮杂双环[5.4.0]十一碳-7-烯:苯甲酸盐(DBU:BA)的催化活性与常规的基于有机金属的催化剂相比具有竞争力在PET合成中。这种离子盐将有机化合物的出色催化能力与金属基催化剂的热稳定性相结合,可抵抗高达> 250˚C的降解,该温度接近PET的工业聚合温度。此外,与有机金属催化剂相比,在DBU:BA存在下乙二醇的二聚度显着降低,这增强了使用DBU:BA合成的PET的热性能。因此,

更新日期:2018-04-27
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