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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Differences can be caused by several reasons; no one <strong>of</strong> these reasons was studied <strong>in</strong> this<br />
work <strong>in</strong> detail, so the follow<strong>in</strong>g ideas must be taken as a speculations.<br />
One factor could be different solubility <strong>of</strong> catalyst system due to the presence <strong>of</strong> different<br />
<strong>in</strong>itiator <strong>in</strong> reaction mixture; it is also important to rule out the possibility <strong>of</strong> conventional free<br />
radical polymerization tak<strong>in</strong>g place to form polystyrene homopolymer, although the catalyst<br />
system should <strong>in</strong>hibit this reaction; part <strong>of</strong> POSS based <strong>in</strong>itiator molecules could be<br />
deactivated with some side reaction, or there is just a steric block for approach <strong>of</strong> molecules<br />
<strong>of</strong> catalyst or monomer to the bulky POSS molecule; these ideas must be taken <strong>in</strong>to<br />
consideration <strong>in</strong> subsequent work on this project.<br />
Convers ion [%]<br />
ln([M]0/[M]t)<br />
M<br />
100<br />
2<br />
1<br />
80<br />
60<br />
40<br />
20<br />
0<br />
0 200 400 600 800 1000<br />
t [m<strong>in</strong>]<br />
Fig. 4: K<strong>in</strong>etic plots<br />
0<br />
0 100 200 300 400 500<br />
25000<br />
20000<br />
15000<br />
10000<br />
5000<br />
t [m<strong>in</strong>]<br />
Fig. 5: Semilogarithmic k<strong>in</strong>etic plots<br />
0<br />
1.00<br />
0 20 40 60 80 100<br />
Co nve rs io n [%]<br />
1.70<br />
1.60<br />
1.50<br />
1.40<br />
1.30<br />
1.20<br />
1.10<br />
D<br />
Polymerization 1<br />
Polymerization 2<br />
Polymerization 1<br />
Polymerization 2<br />
M(th e o r.)<br />
Fig. 6: Molecular weight plot for polymerization 1<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 231<br />
M<br />
D