Przemysl Chemiczny, Vol.93, No.3, 326-330, 2014
Use of alizarin dye in spectrophotometric detection of residual amine in cured epoxy polymer
A corn. epoxy resin was cured with triethylenetetramine (I) (8-16 parts for 100 parts of the resin) and then leached with MeOH, Me2CO or H2O for 3 h to remove unconverted I and det. it by spectrophotometry at 430 nm and 527 nm in presence of alizarin. The highest recovery of I was achieved after leaching with H2O (6.5% by mass) also after 6 mo. long storage of the resin.