Kinetics of resorcinol-formaldehyde polycondensation by DSC

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F18%3AA1901VC1" target="_blank" >RIV/61988987:17310/18:A1901VC1 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs10973-018-7532-0" target="_blank" >https://link.springer.com/article/10.1007%2Fs10973-018-7532-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-018-7532-0" target="_blank" >10.1007/s10973-018-7532-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Kinetics of resorcinol-formaldehyde polycondensation by DSC

Popis výsledku v původním jazyce

The kinetics of resorcinol-formaldehyde polycondensation was investigated by DSC. The resorcinol-formaldehydepolycondensation mixtures were prepared using different catalyst (Na2CO3) concentrations (molar ratio of resorcinol/catalyst R/C = 25 and 50) and mass contents of reactants (w = 20 and 40%). The studied polycondensation mixtureswere heated from 10 to 100 C at five different heating rates (0.5-2.5 C min-1). The two obtained DSC peaks correspondwith two reaction steps (formation of hydroxymethyl derivatives of resorcinol and polycondensation reaction itself). Theoverall reaction heat evolved during both steps corresponds to 97-104 kJ mol-1 for all mixtures. Based on the kineticanalysis, the first reaction step is best fitted by the second-order kinetic model and its rate is controlled by chemicalreaction. The second reaction step can be described by R3 mechanism and is probably limited by diffusion in more viscoussolution. Found kinetics equation allows to predict the composition of reaction mixture during the polycondensation at leastat micro-scale. The obtained results can be useful for prediction of reaction course which can control the porosity ofresorcinol-formaldehyde gels.

Název v anglickém jazyce

Kinetics of resorcinol-formaldehyde polycondensation by DSC

Popis výsledku anglicky

The kinetics of resorcinol-formaldehyde polycondensation was investigated by DSC. The resorcinol-formaldehydepolycondensation mixtures were prepared using different catalyst (Na2CO3) concentrations (molar ratio of resorcinol/catalyst R/C = 25 and 50) and mass contents of reactants (w = 20 and 40%). The studied polycondensation mixtureswere heated from 10 to 100 C at five different heating rates (0.5-2.5 C min-1). The two obtained DSC peaks correspondwith two reaction steps (formation of hydroxymethyl derivatives of resorcinol and polycondensation reaction itself). Theoverall reaction heat evolved during both steps corresponds to 97-104 kJ mol-1 for all mixtures. Based on the kineticanalysis, the first reaction step is best fitted by the second-order kinetic model and its rate is controlled by chemicalreaction. The second reaction step can be described by R3 mechanism and is probably limited by diffusion in more viscoussolution. Found kinetics equation allows to predict the composition of reaction mixture during the polycondensation at leastat micro-scale. The obtained results can be useful for prediction of reaction course which can control the porosity ofresorcinol-formaldehyde gels.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

<a href="/cs/project/LO1208" target="_blank" >LO1208: Teoretické aspekty energetického zpracování odpadů a ochrany prostředí před negativními dopady</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1588-2926

e-ISSN

—

Svazek periodika

—

Číslo periodika v rámci svazku

134

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

8

Strana od-do

1215-1222

Kód UT WoS článku

000450801000036

EID výsledku v databázi Scopus

2-s2.0-85049829630