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Kinetika nastanka pene na osnovi tanina iz skorje iglavcev
Mole, Samo (Author), Šernek, Milan (Mentor) More about this mentor... This link opens in a new window

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Abstract
S termično analizo – diferenčno dinamično kalorimetrijo (DSC) smo proučevali kinetiko nastanka taninske pene na osnovi tanina iz skorje iglavcev. Pri sintezi taninske pene smo uporabili štiri osnovne komponente: furfuril alkohol, glicerol, tanin in katalizator pTSA. Meritve smo opravili na diferenčnem dinamičnem kalorimetru HP DSC1 STAR System, in pri tem uporabili štiri različne temperaturne programe; enega v izotermnih pogojih in tri s kombiniranjem dinamičnih in izotermnih pogojev. Na podlagi meritev smo analizirali sproščeno toplotno energijo in z metodo AMFK »Advanced model free kinetics« izračunali aktivacijsko energijo ter stopnjo utrjenosti taninske pene v odvisnosti od časa, temperature in deleža osnovnih komponent. Proučili smo tudi stopnjo ujemanja podatkov dejanskih meritev z rezultati, ki so bili izračunani z metodo AMFK in ugotovili, da je odstopanje znašalo 7,7 %. Ugotovili smo, da je optimalni delež katalizatorja pTSA med 21 % in 22 %. Večji kot je delež katalizatorja pTSA, krajši je čas do končne stopnje utrjenosti taninske pene. Večji kot je delež furfuril alkohola, glicerola ali tanina, daljši je čas do končne stopnje utrjenosti taninske pene. Uspešno smo proučili kinetiko nastanka taninske pene in pri tem ugotovili, da na njo bistveno vplivajo različni deleži osnovnih komponent in temperatura oziroma pogoji sinteze taninske pene. V našem primeru ni možno izdelati taninske pene pri 20 °C, saj je reaktivnost med osnovnimi komponentami pri tej temperaturi prenizka.

Language:Slovenian
Keywords:reakcijska kinetika, utrjevanje snovi, DSC, taninske pene, tanin iglavcev, drevesna skorja, AMFK
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:BF - Biotechnical Faculty
Year:2017
Publisher:[S. Mole]
UDC:630*813:633.879.6
COBISS.SI-ID:2813833 Link is opened in a new window
Views:472
Downloads:305
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Secondary language

Language:English
Title:Kinetics of the formation of tannin-based foams from the conifers bark
Abstract:
We studied the kinetics of the tannin-based foam formation, from the bark of conifers by thermal analysis, using differential scanning calorimetry (DSC). In the synthesis of tannin-based foam, we used furfuryl alcohol, glycerol, tannin and pTSA catalyst. The measurements were made on the HP DSC1 STAR System differential scanning calorimeter, using four different temperature programs: one in isothermal conditions and three with the combination of dynamic and isothermal conditions. Based on measurements, we analysed the released heat energy and with "Advanced model free kinetics" (AMFK) method we calculated activation energy and the curing degree of tannin-based foam in dependence of time, temperature and proportion of the basic components. We also calculated the level of data matching of actual measurements with the results calculated by the AMFK method, which was 7.7 %. We found that the optimal proportion of the pTSA catalyst is between 21 % and 22 %. The greater the proportion of catalyst pTSA, the shorter the time to the final strength of the tannin-based foam. The greater the proportion of furfuryl alcohol, glycerol or tannin, the longer the time until the final strength of the tannin-based foam was attained. We successfully studied the kinetics of the tannin-based foam formation, and we found that it is significantly influenced by different proportions of the basic components and the temperature or conditions of the synthesis of tannin foam. In our case, it is not possible to produce tannin-based foam at 20 °C, since the reactivity between the basic components at this temperature is too low.

Keywords:reaction kinetics, curing, DSC, tannin-based foams, conifer tannin, tree bark, AMFK

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