School of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China.
College of Life Sciences, Gannan Normal University, Ganzhou 341000, PR China.
Int J Biol Macromol. 2024 Nov;279(Pt 2):135287. doi: 10.1016/j.ijbiomac.2024.135287. Epub 2024 Sep 2.
In this work, the preparation of high-performance and porous regenerated cellulose (RCNH) films for seed germination application were investigated. The films were prepared from bamboo-based cellulose carbamate-NaOH/ZnO/urea and coagulated using environmentally friendly aqueous solution of (NH)SO. The results showed that the pore size of the films could be efficiently controlled by changing the concentration and temperature of the coagulation bath. In a mild environment, the system remains undisturbed, resulting in slow diffusion between the solvent and coagulation bath. This allows for the cellulose molecular chains to align in parallel and self-aggregate, forming a three-dimensional network structure. Therefore, the best mechanical properties were demonstrated by a film coagulated using 5 wt% (NH)SO solution at 10 °C. This film showed excellent tensile strength of 108 MPa and high elongation at break (35 %). As compared to a plastic wrap, the film demonstrated higher permeability for oxygen, and a moisture retaining ability. Due to these properties, it could be used as an agricultural film to encase and promote the growth of mung bean seeds. Moreover, the film was biodegradable with a short decomposition time, losing 90.75 % of its original mass after 63 days. In a summary, this work provides a route for robust, biodegradable, and permeable regenerated cellulose films with potential applications as biodegradable agricultural mulches.
本工作研究了用于种子发芽应用的高性能多孔再生纤维素（RCNH）薄膜的制备。这些薄膜是由竹基纤维素氨基甲酸酯-NaOH/ZnO/尿素制备的，并使用（NH）SO 的环保水溶液进行凝固。结果表明，通过改变凝固浴的浓度和温度，可以有效地控制薄膜的孔径。在温和的环境中，体系保持稳定，溶剂与凝固浴之间的扩散速度较慢。这使得纤维素分子链平行排列并自聚集，形成三维网络结构。因此，在 10°C 下使用 5wt%（NH）SO 溶液凝固的薄膜表现出最佳的机械性能。该薄膜具有 108MPa 的拉伸强度和 35%的高断裂伸长率。与塑料包装相比，该薄膜对氧气具有更高的透过性和保水性。由于这些特性，它可用作农业用薄膜来包裹和促进绿豆种子的生长。此外，该薄膜可生物降解，在 63 天后，其原始质量损失了 90.75%。总之，本工作为具有潜在应用前景的可生物降解农业用覆盖物提供了一种制备强韧、可生物降解和透气的再生纤维素薄膜的途径。
