Kinetics of resorcinol–formaldehyde polycondensation by DSC

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