Institute of Agricultural Science, Chungnam National University, E10-1, Yousung-Gu, Gung-Dong, 305-764 Daejeon, Republic of Korea.
Department of Bio-based Materials, Chungnam National University, Yousung-Gu, Gung-Dong, 305-764 Daejeon, Republic of Korea.
Int J Biol Macromol. 2022 Jun 15;210:752-758. doi: 10.1016/j.ijbiomac.2022.04.232. Epub 2022 May 3.
We could prepare disk-shaped fibers without particular mechanical treatments from Eucheuma cottonii, the commonly used red algae for obtaining carrageenan. After carrageenan extraction from cottonii, the residues were bleached using chlorine dioxide and hydrogen peroxide. The morphology of the bleached fiber was disk-shaped one with a very thin fiber wall thickness of less than 100 nm and a diameter of approximately 100 μm. The sugar analysis and X-ray diffraction of the bleached fibers showed that they consisted of mostly glucose and had the same pattern as cellulose I with more than 50% crystalline structure, respectively. Compared to one-dimensional cellulose micro- or nanofibrils, which exhibits slow drainage and possess intolerably high drying energy, these two-dimensional disk-shaped fibers, when formed a layer in water medium, exhibit fast drainage and low drying energy. The formed sheet resulted in excellent transparency and high oxygen barrier property. Therefore, by using these disk-shaped, thin fibers from cottonii, we expect that the biodegradable and transparent oxygen barrier layer can be produced at a paper machine, which is, if possible, extremely difficult in the case of cellulose micro- or nanofibrils due to their slow drainage and high drying energy.
我们可以从常用于提取卡拉胶的红藻麒麟菜中，不经特殊机械处理直接制备盘状纤维。在从麒麟菜中提取卡拉胶后，用二氧化氯和过氧化氢对残渣进行漂白。漂白纤维的形态为盘状，纤维壁非常薄，厚度小于 100nm，直径约为 100μm。对漂白纤维的糖分析和 X 射线衍射表明，它们主要由葡萄糖组成，且具有与纤维素 I 相同的模式，结晶结构超过 50%。与一维的纤维素微纤维或纳米纤维相比，后者排水缓慢，干燥能耗高得令人难以忍受，而这两种二维盘状纤维在水介质中形成一层时，排水迅速，干燥能耗低。所形成的薄片具有极好的透明度和高阻隔氧气性能。因此，我们期望通过使用这些来自麒麟菜的薄盘状纤维，在造纸机上生产可生物降解且透明的氧气阻隔层，如果可能的话，这在纤维素微纤维或纳米纤维的情况下是极其困难的，因为它们排水缓慢且干燥能耗高。
