在四级酸/二甲基硫氧化物中溶解纤维素的机制
Jingwei Wu1, Yinglin Zhong1, Hongliang Kang2
1Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; College of Chemistry, University of Chinese Academy of Sciences, Beijing 100049, China.
使用二四甲基酸 (TBA2HPO4) 和二甲基硫氧化物 (DMSO) 的新型纤维素溶剂系统显示出优异的纤维素溶解性. 这种环保的溶剂是创造再生纤维素材料的有希望的.
科学领域:
- 绿色化学 绿色化学
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 纤维素的高效利用需要环保的溶剂系统.
- 开发新型溶剂对于纤维素加工和材料创新至关重要.
研究的目的:
- 开发一种新的,环保的纤维素溶剂系统.
- 研究纤维素在TBA2HPO4/DMSO系统中的溶解性和溶解机制.
主要方法:
- 基于二四甲基酸 (TBA2HPO4) 和二甲基硫氧化物 (DMSO) 的纤维素溶剂系统的制备和表征.
- 在不同的TBA2HPO4/DMSO质量比下评估纤维素的溶解性.
- 使用光谱和化学分析对纤维素溶解机制的研究.
主要成果:
- 该TBA2HPO4/DMSO系统表现出良好的纤维素溶解性,取决于质量比.
- 微晶纤维素在60°C的5分钟内溶解在30/70 (w/w) TBA2HPO4/DMSO混合物中.
- 在68/32 (w/w) TBA2HPO4/DMSO系统中,获得的最大纤维素溶解率为14.5%的重量.
- 溶解机制涉及TBA2HPO4解离,其中HPO4(2-) 作为键受体,TBA+形成离子相互作用以溶解纤维素.
结论:
- TBA2HPO4/DMSO系统是一种有效且有前途的环保型纤维素溶剂.
- 溶剂系统通过破坏其结网并隔离纤维素链来促进纤维素的溶解.
- 这种系统具有制备再生纤维素材料的潜力.
更多相关视频
07:13Extraction of Ramie Fiber in Alkali Hydrogen Peroxide System Supported by Controlled-release Alkali Source
Published on: February 6, 2018
09:04Covalent Binding of Antibodies to Cellulose Paper Discs and Their Applications in Naked-eye Colorimetric Immunoassays
Published on: October 21, 2016
相关概念视频
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
Theories of Dissolution: Diffusion Layer Model
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Leveling Effect and Non-Aqueous Acid-Base Solutions
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
Hydrolysis
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
