Tezislər / Theses

 
 
Figure 15. 
Synthesized PUR samples 

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THE 3
rd
 INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS 
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
395
In this present study, to obtain PET-based polyols, the glycolysis 
process is selected as the most desirable and commercially applied, and the 
green method (green reagent, mild condition) and PET-based polyols are 
derived from various ratios of PET to glycol as 1/4, 1/5.5, 1/8 and 1/12, using 
2 wt% zinc acetate as a catalyst in a closed system at 
180 ± 5°𝐶
to 
investigate the glycol effect on properties. Moreover, it was achieved to solve 
the problems associated with PET-based polyols such as solidification and 
high viscosity (which make obstacles to the processing of PUP foams) by the 
direct physical mixing of castor oil and glycerol with PET-based polyol. As a 
result, obtained polyols were dissolved in the bio-oil mixture, and the 
viscosity of the final polyol mixture was significantly reduced. So by this 
innovative approach, castor oil was used as polyol without applying any 
pretreatment for inserting OH group into the structure because the insertion 
of OH group on each of the castor oil ricinoleic chains was compensated by 
using 10% glycerol and optimized content (Table 1) of polyol mixture (which 
is giving desired PUR properties low fragility, higher dimensional stability and 
rigidity) was obtained in Sample 9 shown in Figure 1. 
Table 4.
 Formulation for PUR synthesis 
PUR synthesis was conducted by the free rising method in a thick paper 
cup by adding the required TDI amount into the polyol mixture and mixing it 
for 40-70 seconds. The properties of the appropriate PUR at determined 
formulation were measured and shown that mechanical properties of foams 
increased with increasing PET content in polyol so that compression strength 
of PUR foam was enhanced by 3.5 times, and tensile strength and elongation 
of pressed PUR samples increased by 20% and 23%, respectively, shown in 
Figure 2 and 3.

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