Authors: F Langmaier P Mokrejs K Kolomazník M Mládek R Karnas
Publish Date: 2006/06/27
Volume: 88, Issue: 3, Pages: 857-862
Abstract
Differential scanning calorimetry was employed to investigate the reaction of diglycidyl ethers of bisphenol A DGEBA of mean molecular mass 348–480 Da with collagen hydrolysate of chrometanned leather waste in a solventfree environment The reaction leads to biodegradable polymers that might facilitate recycling of plastic parts in products of the automotive and/or aeronautics industry provided with protective films on this basis The reaction proceeds in a temperature interval of 205–220°C at temperatures approx 30–40°C below temperature of thermal degradation of collagen hydrolysate The found value of reaction enthalpy 51919 J g−1 = 10124 kJ mol−1 of epoxide groups corresponds with currently found enthalpy values of the reaction of oxirane ring with amino groups Reaction heat depends on the composition of reaction mixture or on mass fraction of diglycidyl ethers in the reaction mixture proving the dependence of kinetic parameters of the reaction Arrhenius preexponential factor A min−1 and activation energy E a kJ mol−1 did not succeed Obtained values of kinetic parameters are on a level corresponding to the assumption that reaction kinetics is determined by diffusion
Keywords: