How Alkaline Solvents in Viscosity Measurements Affect Data for Oxidatively Damaged Celluloses: Cupri-Ethylenediamine
| Autor: | Antje Potthast, Thomas Rosenau, Sara Zaccaron, Kyujin Ahn |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Polymers and Plastics
Inorganic chemistry Multiangle light scattering Bioengineering Ethylenediamine 02 engineering and technology Degree of polymerization Alkalies 010402 general chemistry 01 natural sciences Polymerization Biomaterials Gel permeation chromatography chemistry.chemical_compound Materials Chemistry Transition Elements Cellulose Dissolution Molar mass Viscosity 021001 nanoscience & nanotechnology Ethylenediamines 0104 chemical sciences Oxidative Stress chemistry Metals Solvents Molar mass distribution 0210 nano-technology |
| Zdroj: | Biomacromolecules. 20(11) |
| ISSN: | 1526-4602 |
| Popis: | Although efficient and inexpensive, conventional viscometry to determine the average degree of polymerization (DP) of cellulose may mislead the final DP because cellulose degradation occurs in the used solvents, which consist of alkaline amino complexes of transition metals, such as cupri-ethylenediamine (CED). For oxidatively damaged pulps or celluloses, viscosity-DP determinations may be more inaccurate because alkali-induced β-elimination reactions render such oxidized celluloses even more vulnerable. Despite the risk identified in many studies, a systematic investigation of the parameters affecting the viscosity-DP assessed by reliable analytics is still required. Here, a new approach evaluating the effects of CED on oxidized cellulosics was used (i.e., immediate pulp regeneration after dissolution in CED). In-depth molecular feature characterization (e.g., absolute molar masses and oxidized groups' profiling related to molecular weight distribution) by gel permeation chromatography coupled with fluorescence and multiangle laser light scattering clarified the behavior of oxidized celluloses and the influencing parameters upon dissolution in CED. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|