Repeatability in Rheological Measurements of Epoxy Resin

摘要

Shear stress-shear strain rate and shear stress-shear time curves of epoxy resin samples with the number average molecular weight of 283 g/mol were measured at 50 癈 under the modes of steady test and transient test, respectively. Effects of dealy time (t_1) and measurement time (t_2) on the shear stress-shear responses of the epoxy resin oligomer material were studied. It was found that the repeatability of the test results at small shear rates was significantly influenced by the delay time and the measurement time. The values of t_1 and t_2 parameters to be used for the steady test of epoxy resin oligomer material could be optimized based upon the transient test. The measurement repeatablity at shear rates smaller than 7 s~(-1) was apparently improved by setting the delay time and the measurement time longer than 20 s seperately {t_1 = 20 s, t_2= 20 s) with the total delay time and the measurement time shorter than 80 s (t_1 + t2= 80s).