Direct One-Step Controlled Partial Depolymerization and Upcycling of Poly(ethylene terephthalate) into Hyperbranched Oligomeric Ionogel,ACS Sustainable Chemistry & Engineering

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Direct One-Step Controlled Partial Depolymerization and Upcycling of Poly(ethylene terephthalate) into Hyperbranched Oligomeric Ionogel
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-01-18 , DOI: 10.1021/acssuschemeng.2c05911
Ziyan Guo ₁ , Jacob Song Kiat Lim ₁ , Kok Wei Joseph Ng ₁ , Weili Yan ₁ , Nupur Gupta _{1,

2,

3} , Xiao Matthew Hu _{1,

3}

Affiliation

Chemical recycling of poly(ethylene terephthalate) (PET) by depolymerization into monomers to recreate virgin-grade plastics is desirable; however, the energy-inefficient separation and purification steps needed to obtain high-purity monomers result in poor overall economic feasibility at present. Herein, we present a one-step integrated process for partial depolymerization and upcycling of PET oligomers directly into high-value products without any need for solvent recovery and purification. The key strategy for our approach is using multifunctional cleaving agents such as glycerol in the presence of ionic liquid as a catalyst for controlled partial depolymerization of PET via transesterification using N-methyl-2-pyrrolidone (NMP) as a solvent. The obtained depolymerized, oligomeric PET (DOPET) recyclate together with NMP and IL is a gel-like, ionic-conductive material, also termed as an “ionogel”, that has the potential to be used in energy storage applications or as mechanically robust electrical conductors. This is a one-step process requiring no extensive separation and purification of PET oligomers or distillation of solvent for recovery, which further simplifies the recycling process while simultaneously increasing the value of the waste product. We have further investigated the effects of the choice and amount of cleaving agent on the molecular weight and branching of the DOPET oligomers and hence the properties of the upcycled end products. Moreover, we have also shown the versatility of the abovementioned process for controlled depolymerization of other condensation polymers such as polyamides, polyurethane, and even mixed polymer products to obtain high-value functional materials.

中文翻译：

聚对苯二甲酸乙二醇酯直接一步可控部分解聚和循环升级为超支化低聚离子凝胶

通过将聚对苯二甲酸乙二醇酯 (PET) 解聚成单体来重新制造原始级塑料，对其进行化学回收是可取的；然而，目前获得高纯度单体所需的能源效率较低的分离和纯化步骤导致整体经济可行性较差。在此，我们提出了一种将 PET 低聚物部分解聚和升级回收直接转化为高价值产品的一步集成工艺，无需溶剂回收和纯化。我们方法的关键策略是在离子液体存在下使用多功能裂解剂（例如甘油）作为催化剂，通过使用N2进行酯交换来控制 PET 的部分解聚-甲基-2-吡咯烷酮 (NMP) 作为溶剂。获得的解聚低聚 PET (DOPET) 与 NMP 和 IL 一起回收是一种凝胶状离子导电材料，也称为“离子凝胶”，有可能用于储能应用或作为机械坚固的电气导体。这是一个一步法，不需要对 PET 低聚物进行大量分离和纯化，也不需要蒸馏回收溶剂，这进一步简化了回收过程，同时提高了废品的价值。我们进一步研究了裂解剂的选择和用量对 DOPET 低聚物的分子量和支化的影响，进而研究了升级回收的最终产品的性能。而且，

更新日期：2023-01-18

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