Thesis
Preparation and characterizations of a novel lignin based hydrogel
Washington State University
Master of Science (MS), Washington State University
2016
Handle:
https://hdl.handle.net/2376/102462
Abstract
In this work, hydrogels based on lignin and poly(ethylene glycol) diglycidyl ether (PEGDGE) were successfully synthesized. Two kinds of lignin, Kraft lignin and sodium lignosulfonate, were used as the raw materials. In order to improve the reactivity of lignin, amino groups were introduced to the structure of lignin via Mannich reaction. The resulting lignin amine products were characterized by FTIR and elementary analysis. The hydrogels prepared by lignin amine and PEGDGE were characterized by FTIR, solid-state 13C NMR and scanning electron microscopy (SEM) for the identifications of structure and morphology. The hydrogels were prepared with different weight ratios of lignin amine and PEGDGE to investigate the relationship between the composition and swelling capacity and/or rheological properties. It is noted that with increasing lignin amine content in hydrogel, the pore size of the xerogel and swelling capacity increased. The maximum swelling capacity of Kraft lignin hydrogel was 14.4 g/g xerogel while for lignosulfonate hydrogel it was 42 g/g xerogel. The results from this study reveal that the introduced amino groups improved the crosslinking reactivity of lignin and the higher content of lignin amine in the hydrogel was favorable for higher swelling capacity.
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Details
- Title
- Preparation and characterizations of a novel lignin based hydrogel
- Creators
- Hui Xu
- Contributors
- Jinwen Zhang (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525078001842
- Language
- English
- Resource Type
- Thesis