Layering‐Triggered Delayering with Exfoliated High‐Aspect Ratio Layered Silicate for Enhanced Gas Barrier, Mechanical Properties, and Degradability of Biodegradable Polymers,Global Challenges

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Layering‐Triggered Delayering with Exfoliated High‐Aspect Ratio Layered Silicate for Enhanced Gas Barrier, Mechanical Properties, and Degradability of Biodegradable Polymers
Global Challenges ( IF 4.4 ) Pub Date : 2020-05-27 , DOI: 10.1002/gch2.202000030
Jian Zhu ₁ , Anil Kumar ₁ , Pin Hu ₁ , Christoph Habel ₂ , Josef Breu ₂ , Seema Agarwal ₁

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Research on biodegradable polymers with the intention of fast, complete degradation in industrial compost (i‐compost) for organic recyclability is paramount to identifying solutions to the problem of excessive plastic waste originating specifically from packaging. Conventional biodegradable polymers, such as polylactide (PLA), are far from optimum for this application due to the poor gas barrier properties and slow degradation. In the paper, a new concept (triggered degradation by delayering) is shown in which exfoliated, self‐assembled sodium‐hectorite (Hec) arranged in a layer‐by‐layer manner alternating with electrospun hot‐pressed PLA provides strong gas barrier properties at high humidity and simultaneously accelerates the degradation of PLA, as tested in an enzymatic solution and i‐compost. A thin composite film (thickness 56 µm) shows a tensile strength and modulus 58 and 2000 MPa, respectively, whereas oxygen permeability is as low as 0.0064 cm³ cm m⁻² day⁻¹ bar⁻¹. Furthermore, the delayering of the composite film by swelling of Hec layer led to accelerated degradation of PLA, as shown in detail by enzymatic and compost degradation. Since such concepts for enhanced degradability are urgently needed for sustainable utilization of biodegradable polymers in plastic waste management, the present work is an important step ahead.

中文翻译：

使用剥离的高纵横比层状硅酸盐进行分层触发脱层，以增强可生物降解聚合物的气体阻隔性、机械性能和可降解性

对可生物降解聚合物进行研究，旨在在工业堆肥（i-compost）中快速、完全降解以实现有机可回收性，对于确定解决特别来自包装的过量塑料废物问题的解决方案至关重要。传统的可生物降解聚合物，例如聚丙交酯（PLA），由于气体阻隔性能差且降解缓慢，远非该应用的最佳选择。在本文中，提出了一种新概念（通过延迟触发降解），其中以逐层方式排列的剥离自组装钠锂蒙脱石（Hec）与电纺热压 PLA 交替排列，在在酶溶液和 i-compost 中进行了测试，高湿度同时加速了 PLA 的降解。复合薄膜（厚度56μm）的拉伸强度和模量分别为58和2000MPa，而透氧率低至0.0064cm ³ cm m ^-2 day ^-1 bar ^-1。此外，Hec 层膨胀导致复合膜延迟，导致 PLA 加速降解，如酶降解和堆肥降解所详细显示的那样。由于在塑料废物管理中可持续利用可生物降解聚合物迫切需要这种增强可降解性的概念，因此目前的工作是向前迈出的重要一步。

更新日期：2020-05-27

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