Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
Department of Chemistry, School of Engineering, Presidency University, Rajanukunte, Itgalpura, Bangalore, 560064, India.
Sci Rep. 2023 Feb 23;13(1):3168. doi: 10.1038/s41598-023-30078-0.
The aim of the present study is to produce flexible, flame-retardant, water-resistant and biodegradable composite materials. The ultimate goal of this research is to develop simple processes for the production of bio-based materials capable of replacing non-degradable substrates in printed circuit board. Cellulose was chosen as a renewable resource, and dissolved in 1-ethyl-3-methylimidazolium acetate ionic liquid to prepare a cellulosic continuous film. Since flame retardancy is an important criterion for electronic device applications and cellulose is naturally flammable, we incorporated ammonium polyphosphate (APP) as a flame-retardant filler to increase the flame retardancy of the produced materials. The developed material achieved a UL-94 HB rating in the flammability test, while the cellulose sample without APP failed the test. Two hydrophobic agents, ethyl 2-cyanoacrylate and trichloro(octadecyl)silane were applied by a simple dip-coating technique to impart hydrophobicity to the cellulose-APP composites. Dynamic mechanical analysis indicated that the mechanical properties of the cellulosic materials were not significantly affected by the addition of APP or the hydrophobic agents. Moreover, the biodegradability of the cellulosic materials containing APP increased owing to the presence of the cellulase enzyme. The hydrophobic coating slightly decreased the biodegradability of cellulose-APP, but it was still higher than that of pure cellulose film.
本研究旨在制备柔性、阻燃、耐水和可生物降解的复合材料。本研究的最终目标是开发简单的生产工艺，以制备基于生物的材料，这些材料能够替代印刷电路板中不可降解的基板。纤维素被选为可再生资源，并溶解在 1-乙基-3-甲基咪唑醋酸盐离子液体中，以制备纤维素连续膜。由于阻燃性是电子设备应用的一个重要标准，而纤维素本身易燃，我们加入了聚磷酸铵 (APP) 作为阻燃填料，以提高所制备材料的阻燃性。所开发的材料在燃烧性测试中达到 UL-94 HB 等级，而不含 APP 的纤维素样品则未能通过测试。两种疏水剂，乙基 2-氰基丙烯酸酯和三氯（十八烷基）硅烷，通过简单的浸涂技术应用于纤维素-APP 复合材料，以赋予其疏水性。动态力学分析表明，APP 的加入或疏水剂的加入并未显著影响纤维素材料的机械性能。此外，由于存在纤维素酶，含 APP 的纤维素材料的生物降解性增加。疏水性涂层略微降低了纤维素-APP 的生物降解性，但仍高于纯纤维素膜。
