Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China.
Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China.
Int J Biol Macromol. 2023 Dec 1;252:126485. doi: 10.1016/j.ijbiomac.2023.126485. Epub 2023 Aug 23.
Lignocellulose, as a kind of abundant natural resource, continuously developed to convert high value-added biological products is of great significance. Herein, we report a N-methylmorpholine-N-oxide (NMMO) solvent system to completely dissolve unbleached pulp to prepare a renewable lignin-containing cellulose film. The viscosity of the completely dissolved cellulose solution was measured using a high-pressure rotary rheometer. The shear viscosity exceeded 85 Pa·s at a shear rate of 1.62 s. It exhibited shear-thinning non-Newtonian fluid behavior with increasing shear rate. CF-WS had excellent tensile strength (>73 MPa), and exhibited unique optical properties of high transmittance in the visible region and high shielding performance in the ultraviolet region. When the thickness is only 0.016 mm, the UV shielding rate exceeds 75 % (λ < 380 nm). The structure of the bioplastic was revealed by SEM, XPS, and Raman spectroscopy. Directly dissolving lignocellulose in NMMO aqueous solution is expected to yield bioplastics with high strength and biodegradability. It is a potential substitute for petrochemical plastics and provides a possible way for the utilization of agricultural waste.
木质纤维素作为一种丰富的天然资源，不断开发用于转化高附加值的生物制品具有重要意义。在此，我们报告了一种 N-甲基吗啉-N-氧化物（NMMO）溶剂体系，可完全溶解未漂浆，以制备可再生的含木质素纤维素膜。使用高压旋转流变仪测量完全溶解的纤维素溶液的粘度。在剪切速率为 1.62 s 时，剪切粘度超过 85 Pa·s。它表现出剪切稀化的非牛顿流体行为，随着剪切速率的增加而增加。CF-WS 具有优异的拉伸强度（>73 MPa），并表现出独特的光学性能，在可见光区具有高透过率和在紫外区具有高屏蔽性能。当厚度仅为 0.016 mm 时，紫外线屏蔽率超过 75%（λ < 380nm）。通过 SEM、XPS 和拉曼光谱揭示了生物塑料的结构。直接将木质纤维素溶解在 NMMO 水溶液中有望得到高强度和可生物降解的生物塑料。它是石化塑料的潜在替代品，为农业废物的利用提供了一种可能的途径。
