production of selected secondary metabolites in transformed ...

Finally, the solubility parameter of sample δ2 was determined as a function of [η] or Q and
compared with values of these δ2 obtained by calculation from sample’s structures. The
calculation of δ2 from sample’s structures is possible from the contibutions of dispersion Ed,
polar Ep and hydrogen-bonding Eh forces of the polymer.
RESULTS AND DISCUSSION:
The exact sample composition can not be published at the moment because of their
intended patent protection. Therefore, the samples are named by the manufacturer code.
The result of influence of different structure of PUR samples to the value of their
solubility parameter δ2 (10 -3 J 1/2 m -3/2 ):
- Differences in sample structures were especially polymer’s molecular weight and size of
chain, type and functionality of used alcohols, acids and isocyanates.
Limiting viscosity number of
samples [η] (m 3 /kg)
Solubility parametrs of PUR samples δ2 determined according to
0,09
limiting viscosity number [η]
U14EG2000
0,08
Diexter G214
C36EG34
0,07
Priplast 3192
0,06
0,05
0,04
0,03
0,02
0,01
0,00
19,0 19,5 20,0 20,5 21,0 21,5 22,0 22,5 23,0 23,5 24,0 24,5 25,0 25,5 26,0
Solubility parametr of solvent δ 1(10 -3 J 1/2 m -3/2 )
U14EG56
U14BD2000
According to the theory, the solubility parameter δ2 value corresponds to the point where
the plot of [η] as a function of δ1 has its maximum.
Determination of solubility parameter δ2 as the function of limiting viscosity number
and by calculation from structure:
Solvents:
Solubility
parameter
δ1
Limiting viscosity number of tested samples [η] (m 3 /kg)
U14EG2000 Diexter C36EG34 Priplast U14EG56 U14BD2000
Dichloromethane 19,8 0,0076 0,0173 0,0094 0,0071 - 0,0266
1,4-dioxane 20,5 0,0135 0,0117 0,0093 0,0048 0,0515 0,0540
Acetyl acetone 22,1 0,0180 0,0087 0,0199 0,0068 0,0856 0,0570
N,Ndimethylacetamide 22,7 0,0618 0,0337 0,0677 0,0243 0,0638 0,0580
N methylpyrrolidone 22,9 0,0150 0,0425 0,0193 0,0163 0,0686 0,0514
N,Ndimethylformamide 24,7 0,0400 0,0144 0,0000 0,0185 - 0,0413
Solubility parameter δ2(10 -3 J 1/2 m -3/2 )
Determined from measuring 22,7 22,9 22,7 22,7 22,1 22,7
Determined from structure 21,37 23,87 21,31 21,78 20,92 21,25
According to the obtained results and the theory, we can predict that the total solubility
parameters δ2 of our tested PUR samples are about 22,7×10 -3 J 1/2 m -3/2 and in case of U14EG56
Sborník soutěže Studentské tvůrčí činnosti Student 2006 a doktorské soutěže O cenu děkana 2005 a 2006
Sekce DSP 2006, strana 251