聚乳酸材料的化学解聚研究进展
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1.青岛科技大学研究生院;2.化学与分子工程学院生态化工教育部重点实验室

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国家自然科学基金资助项目(22178191)


Progress in Chemical Depolymerization of Polylactic Acid Materials
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    摘要:

    聚乳酸(PLA)作为一种性能优良的生物降解材料,被用于工业、包装业及医药业等领域。随着PLA的广泛使用,其生产和消耗的数量急剧增加,最终导致废旧PLA的堆积日益严重。尽管PLA能在自然条件下降解,但降解周期过长,降解产物也无法直接进行循环再利用。通过化学回收法可将PLA材料进行解聚,生成相应的小分子产物,产物经分离、纯化后可重新作为生产PLA的单体或合成其它化工产品的原料,从而实现资源的循环利用。本文综述了近年来国内外聚乳酸(PLA)材料的化学降解回收产品的研究现状,介绍了几种主要的化学解聚方法,包括热裂解、水解、醇解、酶解及光解等,并对各方法的优缺点进行了分析与总结。最后,对PLA的化学降解进行了展望。

    Abstract:

    Polylactic acid (PLA), as a kind of biodegradable materials with excellent properties, is widely used in industry, packaging and pharmaceutical industries. With the widespread use of PLA, the amount of its production and consumption has increased dramatically, which will lead to a serious accumulation of PLA waste. Although PLA can be degraded under natural conditions, the degradation cycle is too long and the degradation products cannot be recycled directly. By chemical recycling methods, PLA materials can be depolymerized to generate corresponding small molecular products. After separation and purification, the products can be reused as monomers for the production of PLA or raw materials for synthesizing other chemical products, which can realize the recycling of resources. In this paper, the research status of the chemical degradation and recycling products of PLA materials in China and abroad in recent years was reviewed, and several main chemical depolymerization methods were introduced, including thermal cracking, hydrolysis, alcoholysis, enzymatic hydrolysis and photolysis. The advantages and disadvantages of each method were analyzed and summarized. Finally, the chemical degradation of PLA was prospected.

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  • 收稿日期:2021-12-31
  • 最后修改日期:2022-04-09
  • 录用日期:2022-04-24
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