Reactivity of epoxy resin in dispersed dicyandiamide system and dynamic viscoelasticity of the resulting product

摘要: A study was made on the curing reaction, leading to a cross-linked network, of bisphenol diglycidyl either in dispersed dicyandiamide (DICY) system containing benzyl dimethylamine accelerator and dynamic viscoelasticity resulting product as related DICY particle size (Ds), compared with dissolved system. The reaction rate varied inversely logarithmic Ds directly total surface area particles, finally attainable extent epoxide group decreased increasing Ds. Activation energy ranged from 14 17 kcal/mole depending slightly cured also affected greatly by Cured 3 μm displayed only primary transition peak around 180°C plots viscoelastic decrement function temperature. With larger than 10 Ds, number peaks increased two or three, peak, secondary 140μC, tertiary 90μC. relative height proceeded at much same 25 system, but yielded similar that