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Novel Strategies for Recycling Poly(butylene adipate-co-terephthalate)-Starch-Based Plastics: Selective Solubilization and Depolymerization–Repolymerization Processes
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-09-19 , DOI: 10.1021/acssuschemeng.3c03588
Adriano Parodi 1 , Vincenzo Arpaia 1 , Chiara Samorì 1 , Laura Mazzocchetti 2 , Paola Galletti 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-09-19 , DOI: 10.1021/acssuschemeng.3c03588
Adriano Parodi 1 , Vincenzo Arpaia 1 , Chiara Samorì 1 , Laura Mazzocchetti 2 , Paola Galletti 1
Affiliation
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Starch-based plastics (SBPs) containing poly(butylene adipate-co-terephthalate) (PBAT) are among the most produced bioplastics on the market and are currently managed at their end of life (EoL) through composting. In view of developing novel EoL approaches, SBPs were characterized here in terms of their main components (PBAT, starch, and plasticizer), and three strategies for their recycling were investigated: (I) the selective solubilization of PBAT with ethyl acetate; (II) a two-step depolymerization–repolymerization process that consists of the catalytic selective alcoholysis of PBAT into its oligomers, followed by their repolymerization to PBAT with no need of adding a new catalyst; and (III) the complete selective depolymerization of PBAT, followed by the recovery and purification of butanediol (1,4-BD), dimethyl terephthalate (DMT), and dimethyl adipate (DMA). Up to 99, 95, and 93% recovery of the SBP components was obtained, respectively, following these three methods. Extensive characterization of the recovered PBAT was performed through molecular weight and thermal and thermomechanical analyses, demonstrating the efficiency of the processes. The environmental sustainability of the proposed approaches was also preliminarily evaluated through the calculation of their environmental factor (E-factor).
中文翻译：
回收聚（己二酸-对苯二甲酸丁二醇酯）-淀粉基塑料的新策略：选择性溶解和解聚-再聚合过程
含有聚己二酸丁二醇酯的淀粉基塑料 (SBP)对苯二甲酸酯 (PBAT) 是市场上产量最多的生物塑料之一，目前通过堆肥在其使用寿命结束 (EoL) 时进行管理。为了开发新的 EoL 方法，本文对 SBP 的主要成分（PBAT、淀粉和增塑剂）进行了表征，并研究了其回收的三种策略：（I）用乙酸乙酯选择性溶解 PBAT；(II)两步解聚-再聚合过程，即PBAT催化选择性醇解成低聚物，然后再聚合成PBAT，无需添加新的催化剂；(III) PBAT完全选择性解聚，然后回收和纯化丁二醇(1,4-BD)、对苯二甲酸二甲酯(DMT)和己二酸二甲酯(DMA)。高达 99、95、按照这三种方法，SBP 成分的回收率分别为 93%。通过分子量以及热和热机械分析对回收的 PBAT 进行了广泛的表征，证明了该过程的效率。还通过计算其环境因子（E-因子）初步评估了所提出方法的环境可持续性。
更新日期：2023-09-19
中文翻译：
回收聚（己二酸-对苯二甲酸丁二醇酯）-淀粉基塑料的新策略：选择性溶解和解聚-再聚合过程
含有聚己二酸丁二醇酯的淀粉基塑料 (SBP)对苯二甲酸酯 (PBAT) 是市场上产量最多的生物塑料之一，目前通过堆肥在其使用寿命结束 (EoL) 时进行管理。为了开发新的 EoL 方法，本文对 SBP 的主要成分（PBAT、淀粉和增塑剂）进行了表征，并研究了其回收的三种策略：（I）用乙酸乙酯选择性溶解 PBAT；(II)两步解聚-再聚合过程，即PBAT催化选择性醇解成低聚物，然后再聚合成PBAT，无需添加新的催化剂；(III) PBAT完全选择性解聚，然后回收和纯化丁二醇(1,4-BD)、对苯二甲酸二甲酯(DMT)和己二酸二甲酯(DMA)。高达 99、95、按照这三种方法，SBP 成分的回收率分别为 93%。通过分子量以及热和热机械分析对回收的 PBAT 进行了广泛的表征，证明了该过程的效率。还通过计算其环境因子（E-因子）初步评估了所提出方法的环境可持续性。
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