Organizing co mmittee

1
) and cellulose nanofibers (
2
) 
It was found by X-ray diffraction analysis that the original cellulose has a type I 
polymorph (characteristic peaks at 2θ = 14.9°, 16.3°, 22.5° and 34.6°. After dissolving 
cellulose in a solvent and subsequent regeneration, electrospun cellulose fibers more 
amorphous, and the remaining crystalline parts are type II polymorphs 
References 
1. Wan Farahhanim Wan Fathilah&RizafizahOthaman. Electrospun Cellulose Fibres 
and Applications. SainsMalaysiana 48(7) (2019): 1459–1472 
2. RaghavanPrasanth, Shubha Nageswaran, Vijay Kumar Thakur and Jou-Hyeon 
Ahn Electrospinning of Cellulose: Process and Applications. Nanocellulose Polymer 
Nanocomposites, (311–340) 2015 

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Poster presentation 
210 
PREPARATION AND RESEARCH OF MICROCRYSTALLINE 
CELLULOSE AND NANOCELLULOSE FROM LICORICE ROOT 
CELLULOSE 
 
D.J. Ergashev, M.Q. Saidmuhammedova, A.A. Atakhanov 
Institute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, 
Tashkent, Uzbekistan, 
e-mail: [e-mail] 
 
In recent years, researches on the creation of new types of products and introduction 
of production technologies in world practice are being carried out at a rapid pace. 
At this point, microcrystalline cellulose (MCC) and nanocellulose (NC) derivatives, 
a modified form of cellulose, which is considered the most widespread and renewable 
natural polymer on earth, are receiving great attention. 
In this work, MCC and nanocellulose NC were obtained from licorice root cellulose 
by acid hydrolysis method. 
MCC extraction from licorice root cellulose was carried out under the conditions of 4 
12% of nitric acid (HNO
3
), temperature 100-110°C, modulus 1:10, duration of 
hydrolysis 30-90 minutes as a hydrolyzing agent. 
The results of the conducted research show that with increasing acid concentration 
and duration of hydrolysis, the degree of polymerization of MCC, depending on the acid 
concentration, the degree of polymerization (DP) of MCC obtained from licorice root 
cellulose decreases from 500 to 250. It was observed that the yield decreased to 70% 
and the degree of crystallization (DC) changed from 56% to 71% in MCC obtained 
from licorice root cellulose due to the hydrolysis of a certain part of the amorphous area 
in the cellulose. 
NC from licorice root cellulose were obtained by hydrolysis in aqueous solutions of 
sulfuric acid (H
2
SO
4
) with different concentrations: acid concentration 40, 50, 55, 60, 
65%, temperature 25-50°C, module 1:10 duration 60-120 minutes and It was carried out 
under conditions consisting of ultrasonic dispersion for 30 min. 
The results of the conducted research show that the DP of NC decreased from 360 to 
150 due to the increase of acid concentration, hydrolysis temperature and duration of 
hydrolysis, acceleration of the hydrolysis process. Due to the fact that a certain part of 
the amorphous area of the cellulose structure in licorice root cellulose undergoes 
hydrolysis and passes into the solution, it was found that the output yield of NC 
decreased and DC changed from 59% to 81% when the acid concentration was 
increased from 40% to 60%. A further increase in acid concentration had a negative 
effect on the DC of the NC samples, that is, the degree of crystallinity of the NC sample 
obtained in a 65% acid solution was 68%, which was explained by the increase. caused 
by the effect of the acid concentration on the crystal structure of cellulose. 
The possibility of obtaining MСС and NС from licorice root cellulose under different 
conditions was studied and it was shown that the structure and properties of MСС and 
NС depend on the hydrolysis conditions.