植物角质层启发的聚酯作为有前途的绿色和可持续聚合物材料,ACS Applied Polymer Materials

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植物角质层启发的聚酯作为有前途的绿色和可持续聚合物材料
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-07-08 , DOI: 10.1021/acsapm.1c00585
Shuvra Singha ₁ , Vasantha Gowda ₂ , Mikael S. Hedenqvist ₁

Affiliation

植物角质层是一种疏水性屏障膜，主要存在于叶表面和果皮上。这项工作介绍了受角质层启发的聚（羟基十六酸酯）（PHHA）的结构和屏障特性，这是一种 ω-羟基脂肪酸衍生的生物聚酯。PHHA通过熔融缩聚与甘油共聚和交联，并通过压缩成型制造薄膜。该研究显示了添加三官能共聚单体对热、机械和阻隔性能的影响。纯 PHHA 由于其较高的结晶度，表现出最好的水蒸气阻隔性能，但形成了脆性薄膜。另一方面，甘油共聚薄膜具有柔韧性，并且在阻隔性能和机械性能之间表现出良好的平衡。水蒸气透过率总体上与PLA相似，和苎烯（一种疏水性食品成分）的吸收和扩散率低于低密度聚乙烯（包装常用的聚合物）。此外，聚酯具有紫外线阻挡性能。薄膜的制作方式产生了粗糙的表面，模仿植物角质层中具有高防水性的外部粗糙蜡层。因此，这些受角质启发的聚酯有望用于例如防水（包装/设备）应用，前提是开发了有效/可持续生产/分离单体的手段。模仿植物角质层中具有高防水性的外部粗糙蜡层。因此，这些受角质启发的聚酯有望用于例如防水（包装/设备）应用，前提是开发了有效/可持续生产/分离单体的手段。模仿植物角质层中具有高防水性的外部粗糙蜡层。因此，这些受角质启发的聚酯有望用于例如防水（包装/设备）应用，前提是开发了有效/可持续生产/分离单体的手段。

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Plant Cuticle-Inspired Polyesters as Promising Green and Sustainable Polymer Materials

The plant cuticle is a hydrophobic barrier membrane found mainly on leaf surfaces and fruit skin. This work presents the structural and barrier properties of cuticle-inspired poly(hydroxyhexadecanoate) (PHHA), an ω-hydroxy fatty acid-derived biopolyester. PHHA was copolymerized and cross-linked with glycerol by melt polycondensation, and films were fabricated by compression molding. The study showed the effect of the addition of a trifunctional comonomer on the thermal, mechanical, and barrier properties. The neat PHHA, owing to its higher crystallinity, demonstrated the best water vapor barrier properties, but formed brittle films. The glycerol-copolymerized films, on the other hand, were flexible and displayed a good balance between barrier and mechanical properties. The water vapor transmission rate was overall similar to that of PLA, and limonene (a hydrophobic food component) uptake and diffusivity were lower than that of low-density polyethylene, the commonly used polymer for packaging. In addition, the polyester had UV-blocking properties. The way the films were made yielded a rough surface, mimicking the outer rough wax layer in plant cuticles with high water repellence. Hence, these cutin-inspired polyesters are promising for, e.g., water barrier (packaging/device) applications, provided means of efficient/sustainable production/isolation of the monomer is developed.

更新日期：2021-08-13

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