A5000548351- Lignin and Wood Chemistry
- Advanced Cellulose Research Studies
- Catalysis for Biomass Conversion
- Biofuel production and bioconversion
- Aerogels and thermal insulation
- Nanocomposite Films for Food Packaging
- Catalysis and Hydrodesulfurization Studies
- Enzyme-mediated dye degradation
- biodegradable polymer synthesis and properties
- Advanced Sensor and Energy Harvesting Materials
- Ionic liquids properties and applications
- Chemical Synthesis and Reactions
- Structural Analysis of Composite Materials
- Forest Biomass Utilization and Management
University of Helsinki
2013-2020
Helsinki Art Museum
2019
Swedish Chemicals Agency
2015
Kemerovo Cardiology Center
2015
Abstract Herein, we demonstrate the activation of commercial chemical cellulose pulps towards modification by a pre-treatment step with tetrabutylphosphonium acetate ([P 4444 ][OAc]). A heterogeneous (non-dissolving) was applied allowing for significant reduction in crystallinity, without concomitant formation thermodynamically stable II. An increase reactivity demonstrated using two model reactions; (1) acetylation (organic swelling conditions), where high degrees substitution (DS) were...
Cellulose acetate is widely used in films, filters, textiles, lacquer and cosmetic products. Herein we demonstrate the production of cellulose esters under homogeneous conditions using 1,5-diazabicyclo[4.3.0]non-5-ene ([DBNH][OAc]) as solvent. The reagents have been chosen such that system recyclable, i.e. by-products are low boiling easy to remove. It demonstrated can be synthesized with different degree substitution (DS) values, some commonly acylation regents, like vinyl carboxylates...
Cellulose acetate is one of the most important cellulose derivatives. Herein we present a method to access with low degree substitution through homogeneous reaction in ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium ([DBNH][OAc]). This has also been identified as an excellent solvent for dry-jet wet fiber spinning. was dissolved [DBNH][OAc] and esterified situ be immediately spun into modified filaments (DS) value 0.05–0.75. The structural properties resulting fibers, which are characterized...
Autohydrolysis, an economical pre-treatment, allows for dissolution and chemical modification of wood chips.
In modern biorefineries, low value lignin and hemicellulose fractions are produced as side streams. New extraction methods for their purification needed in order to utilize the whole biomass more efficiently produce special target products. several new applications using plant-based biomaterials, native-type chemical polymeric properties desired. Especially, production of high-quality enables valorization entirely, thus making novel processes sustainable economically viable. To investigate...
Abstract Ionic liquids are used to dewater a suspension of birch Kraft pulp cellulose nanofibrils (CNF) and as medium for water‐free topochemical modification the nanocellulose (a process denoted “WtF‐Nano”). Acetylation was applied model reaction investigate degree scope effective ionic liquid structures. Little difference in reactivity observed when water removed, after introduction an or molecular co‐solvent. However, viscoelastic properties CNF suspended two show that more basic, but...