Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA.
Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA; Apparel, Merchandising, Design and Textiles, Washington State University, Pullman, WA 99164, USA.
Carbohydr Polym. 2019 Dec 15;226:115276. doi: 10.1016/j.carbpol.2019.115276. Epub 2019 Aug 30.
This study assessed the applicability of chitin nanocrystals employed in combination with an existing coating material intended for flexible packaging. The 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) oxidized chitin nanocrystals (TOCNs) were applied 1) as an additive in a water-based acrylic resin (WBAR) that was then coated onto the surface of a biaxially oriented polypropylene (BOPP) film, and 2) as a neat layer in multilayered BOPP laminates bonded by a WBAR adhesive layer. The results indicated that the flow behavior and shear viscosity of the TOCN/WBAR system were dependent on TOCN contents. The TOCNs as a dispersed phase in the acrylic resin matrix did not improve the oxygen barrier property of the resulting coated BOPP. By contrast, the neat continuous TOCN coating layer improved the oxygen barrier property of the laminates of BOPP and TOCNs bonded by the acrylic resin, a 44% oxygen transmission rate reduction for a laminate with a 8.33-μm TOCN layer compared to the laminate without a TOCN layer. The inclusion of the TOCNs maintained the optical transparency of the resulting films.
本研究评估了壳聚糖纳米晶在与现有的柔性包装用涂层材料结合使用时的适用性。2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化壳聚糖纳米晶（TOCNs）被应用于 1）作为添加剂加入到水性丙烯酸树脂（WBAR）中，然后涂覆在双向拉伸聚丙烯（BOPP）薄膜的表面上，以及 2）作为 neat 层加入到由 WBAR 胶黏剂层黏合的多层 BOPP 层压板中。结果表明，TOCN/WBAR 体系的流动行为和剪切黏度取决于 TOCN 的含量。TOCN 作为分散相在丙烯酸树脂基质中并没有改善所得涂层 BOPP 的氧气阻隔性能。相比之下， neat 连续 TOCN 涂层改善了由丙烯酸树脂黏合的 BOPP 和 TOCN 层压板的氧气阻隔性能，对于具有 8.33-μm TOCN 层的层压板，氧气透过率降低了 44%，而对于没有 TOCN 层的层压板则没有降低。TOCNs 的加入保持了所得薄膜的光学透明度。
