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The exact sample composition can not be published at the moment because 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