highly significantp < 0.001
Factorial ANOVA results confirmed the following: PEG M w has a statistically significant effect on T CP ( p = 0.009); Diol structure has a highly significant effect on T CP ( p < 0.001); Diisocyanate type and diol:PEG ratio do not significantly affect T CP ( p = 0.76 and p = 0.42, respectively). 3.6.2.