Department of Plant & Environmental New Resources and Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, South Korea.
Materials Research and Engineering Center, Hyundai Motor Company, Chuldobakmulgwan-ro 37, Uiwang-si, Gyeonggi-do, 16082, South Korea.
Carbohydr Polym. 2022 Sep 1;291:119514. doi: 10.1016/j.carbpol.2022.119514. Epub 2022 Apr 25.
While cellulose nanofiber-based bioplastics are of great interest for replacing synthetic polymer and glass materials, the main limitation is their low thickness, which makes them difficult for various applications. In this study, we fabricated millimeter-scale thick bioplastic composites, based on 2,2,6,6-tetramethylpiperidine-1-oxy-oxidized cellulose nanofibers (TEMPO-CNF) and epoxy resin, via sequential lamination processes. The glycerol as softener was added to TEMPO-CNF dispersion to prepare a thick TEMPO-CNF layer without shrinkage. It was discovered that the total thickness of TEMPO-CNF/epoxy laminates can be easily controlled by changing the thickness and number of TEMPO-CNF layers and the total thickness can also be easily increased up to 2.4 mm. Furthermore, these TEMPO-CNF/epoxy laminates have high flexural strength (272 MPa) as well as good transmittance (85% % at 600 nm). We anticipate that our approach will significantly broaden the strategies for fabricating nanocellulose-based bioplastics for use as a replacement for transparent synthetic polymers and glass materials.
虽然基于纤维素纳米纤维的生物塑料对于替代合成聚合物和玻璃材料具有很大的吸引力，但主要的限制是其厚度低，这使得它们难以应用于各种领域。在这项研究中，我们通过层压工艺制备了基于 2,2,6,6-四甲基哌啶-1-氧基-氧化纤维素纳米纤维（TEMPO-CNF）和环氧树脂的毫米级厚生物塑料复合材料。甘油作为增塑剂被添加到 TEMPO-CNF 分散体中，以制备无收缩的厚 TEMPO-CNF 层。结果发现，通过改变 TEMPO-CNF 层的厚度和数量，可以轻松控制 TEMPO-CNF/环氧树脂层压板的总厚度，并且总厚度也可以轻松增加到 2.4mm。此外，这些 TEMPO-CNF/环氧树脂层压板具有高弯曲强度（272MPa）和良好的透光率（600nm 时为 85%）。我们预计，我们的方法将极大地拓宽制造纳米纤维素基生物塑料的策略，以替代透明的合成聚合物和玻璃材料。
