微波等离子体预处理对棉纤维素溶解的影响。
Effect of Microwave Plasma Pre-Treatment on Cotton Cellulose Dissolution.
机构信息
Department of Plant and Soil Science, Fiber and Biopolymer Research Institute, Texas Tech University, Lubbock, TX 79409, USA.
出版信息
Molecules. 2022 Oct 18;27(20):7007. doi: 10.3390/molecules27207007.
The utilization of cellulose to its full potential is constrained by its recalcitrance to dissolution resulting from the rigidity of polymeric chains, high crystallinity, high molecular weight, and extensive intra- and intermolecular hydrogen bonding network. Therefore, pretreatment of cellulose is usually considered as a step that can help facilitate its dissolution. We investigated the use of microwave oxygen plasma as a pre-treatment strategy to enhance the dissolution of cotton fibers in aqueous NaOH/Urea solution, which is considered to be a greener solvent system compared to others. Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, and Powder X-ray Diffraction analyses revealed that plasma pretreatment of cotton cellulose leads to physicochemical changes of cotton fibers. Pretreatment of cotton cellulose with oxygen plasma for 20 and 40 min resulted in the reduction of the molecular weight of cellulose by 36% and 60% and crystallinity by 16% and 25%, respectively. This reduction in molecular weight and crystallinity led to a 34% and 68% increase in the dissolution of 1% (/) cotton cellulose in NaOH/Urea solvent system. Thus, treating cotton cellulose with microwave oxygen plasma alters its physicochemical properties and enhanced its dissolution.
纤维素的充分利用受到其聚合链刚性、高结晶度、高分子量和广泛的分子内和分子间氢键网络的影响，导致其难以溶解。因此，通常认为纤维素的预处理是可以帮助其溶解的一个步骤。我们研究了使用微波氧气等离子体作为预处理策略来提高棉纤维在含水 NaOH/Urea 溶液中的溶解性能，与其他溶剂系统相比，该溶剂系统被认为更环保。衰减全反射傅里叶变换红外光谱、扫描电子显微镜和粉末 X 射线衍射分析表明，等离子体预处理棉纤维素会导致棉纤维的物理化学变化。用氧气等离子体对棉纤维素预处理 20 和 40 分钟，分别导致纤维素的分子量降低 36%和 60%，结晶度降低 16%和 25%。分子量和结晶度的降低导致 1%（/）棉纤维素在 NaOH/Urea 溶剂系统中的溶解率分别提高了 34%和 68%。因此，用微波氧气等离子体处理棉纤维素会改变其物理化学性质并提高其溶解性能。
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