at least 90 wt diglycidylether of bisphenol a dgeba and less than 10 wt of c12 and c14 monooxiranes the rimh038 curing agent contains 50 70 wt polyoxypropylenediamine the resin and the curing agent were prior to experiments preheated to 25 u00b0 c 587 3 g of rim035 resin was mixed with 162 7 g rimh038 curing agent stoichiometric ratio the curing agent and the resin were manually mixed with a wooden spatula for 4 minutes in a mixing bucket after mixing the curing agent and the resin the organic acid was added to the mixture in a molar ratio of 1 16 with respect to the curing agent content the added organic acids had room temperature after adding the acid the mixture was stirred again a j type temperature sensor was placed in the centre of the mixing bucket containing the resin curing agent and organic acid and the mixing bucket was placed in a friocell heating chamber mmm medcenter einrichtungen germany operating at 25 u00b0 c the temperature in the mixture was measured every minute throughout the curing process the following organic acids have been used in the examples 1 to 4 all acids have been obtained from sigma aldrich example 1 acetic acid purity u2267 99 lot shbb1567v also called ethanoic acid the reference sample shown in the fig2 and 3 is the same resin.