Versatile Chemical Recycling Strategies: Value-Added Chemicals from Polyester and Polycarbonate Waste.

Versatile Chemical Recycling Strategies: Value-Added Chemicals from Polyester and Polycarbonate Waste.
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DOI:
10.1002/cssc.202200255
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发表时间:
2022-04-22
期刊:
影响因子:
8.4
通讯作者:
--
中科院分区:
化学2区
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带有半萨兰配体的 ZnII 配合物被用于各种商业聚酯和聚碳酸酯的温和和选择性化学升级回收。值得注意的是,我们报道了离散金属介导的聚(双酚 A 碳酸酯)(BPA-PC)甲醇分解的第一个例子,该反应在室温下相当活跃。事实上,Zn(2)2 和 Zn(2)Et 在 2-Me-​​THF 中可在 12-18 分钟内完全消耗 BPA-PC,并在 2-4 小时内获得高双酚 A (BPA) 产率 (SBPA =85-91%)。进一步的动力学分析发现,这种催化剂在 4 wt% 浓度下的 kapp 值分别为 0.28±0.040 和 0.47±0.049 min−1,是迄今为止报道的最高值。通过生产几种可再生的聚(酯酰胺)(PEA),证明了一种完全循环的塑料废物升级回收方法,这种方法基于源自瓶级聚对苯二甲酸乙二醇酯(PET)的对苯二甲酰胺单体,具有优异的热性能。 完整循环:带有半萨兰配体的 ZnII 配合物有助于将各种商业聚酯和聚碳酸酯温和且选择性地降解为增值产品(绿色溶剂和化学结构单元)。我们报告了第一个离散金属介导的聚(双酚 A 碳酸酯)甲醇解反应在室温下相当活跃的例子,同时几种可再生聚(酯酰胺)的生产展示了一种完全循环的 PET 废物升级回收方法。
ZnII‐complexes bearing half‐salan ligands were exploited in the mild and selective chemical upcycling of various commercial polyesters and polycarbonates. Remarkably, we report the first example of discrete metal‐mediated poly(bisphenol A carbonate) (BPA‐PC) methanolysis being appreciably active at room temperature. Indeed, Zn(2)2 and Zn(2)Et achieved complete BPA‐PC consumption within 12–18 mins in 2‐Me‐THF, noting high bisphenol A (BPA) yields (SBPA =85–91 %) within 2–4 h. Further kinetic analysis found such catalysts to possess kapp values of 0.28±0.040 and 0.47±0.049 min−1 respectively at 4 wt%, the highest reported to date. A completely circular upcycling approach to plastic waste was demonstrated through the production of several renewable poly(ester‐amide)s (PEAs), based on a terephthalamide monomer derived from bottle‐grade poly(ethylene terephthalate) (PET), which exhibited excellent thermal properties. Full circle: ZnII‐complexes bearing half‐salan ligands facilitate the mild and selective degradation of various commercial polyesters and polycarbonates into value‐added products (green solvents and chemical building blocks). We report the first example of discrete metal‐mediated poly(bisphenol A carbonate) methanolysis being appreciably active at room temperature, whilst the production of several renewable poly(ester‐amides)s demonstrates a completely circular PET waste upcycling approach.
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影响因子: 4.6
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