production of selected secondary metabolites in transformed ...

22,1×10 -3 J 1/2 m -3/2 . However, if we calculate the value δ2 from the structure, we obtain
approximately similar values of δ2 in a range of 20,9 to 23,9×10 -3 J 1/2 m -3/2 . The biggest
differences are in case of Diexter G214 and U14EG56 where the biggest differences between
their structures are also.
According to these results, it should be possible to dissolve these samples in solvents with
total solubility parameter value of δ1 about 20 to 24 units.- And in most cases, experimental
results comply with theory and samples could be dissolved in solvents with value of δ1≈δ2 ± 2.
Solubility of PUR sample U14EG56 in various type of solvent:
solubility U14EG56
solubility U14EG56
Solvent: p. δ1 δ2 ≈ 22,1 Solvent:
p. δ1 δ2 ≈ 22,1
Toluene 18,2 * N,N dimethylacetamide 22,7 +
Ethylmethylketone 19 + N methylpyrrolidone 22,9 +
Dichloromethane 19,8 + Isopropanol 23,6 -
Acetone 20 * N,N dimethylformamide 24,7 +
1,4-Dioxane 20,5 + Ethanol 26 -
Acetyl acetone 22,1 + Butyrolactone 27 -
Ethylene glycol 30 -
In the case, when sample is not soluble in right one solvent according to the theory, it can
be interpreted by different chemical nature of used solvents and it relates to different value of
individual components of their total solubility parameter.
The result of study of influence of different values of rigid segment fraction and crosslinked
fraction content of sample U14BD2000 to its solubility parameter, according its
parameter of swelling:
During the study of the influence of rigid segment content and cross-linked fraction
content to the solubility parameter, it was observed that the more rigit segment fraction and/or
cross-linked fraction is present, the more resistent the sample was. All these changes should
be connected with a changes of sample solubility parametr and should be observable
experimentally.
Study of the influence of different percentage distribution of rigid segment fraction in
case of sample U14BD2000:
Parameter of swelling Q
(Type A with the less quantity, type D with the most quantity of rigid segment content)
16
14
12
10
8
6
4
2
Influence of different quantity of rigid segment to the
solubility parametr of U14BD2000 (according its
parameter of swelling)
type A
type B
type C
type D
0
19,0 20,0 21,0 22,0 23,0 24,0 25,0
Solubility parameter of solvent δ1 (10-3J1/2m -3/2 )
Type of
sample:
δ2 - from
measuring
δ2 - from the
structure
A 19,8 20,11
B 20,5 20,72
C 22,9 21,34
D 22,9 21,96
Sborník soutěže Studentské tvůrčí činnosti Student 2006 a doktorské soutěže O cenu děkana 2005 a 2006
Sekce DSP 2006, strana 252