Abstract
A study was made of deformation of densely crosslinked glassy polymers prepared from resorcinol diglycidyl ester and 2,6-diaminopyridine in the yield point region. δ− ε Stress/strain curves and compression curves were plotted in the temperature range of 22–100° and in the range of rates of deformation ε≈10 −3−10 0 min −1. Experimental results were analysed in terms of the thermo-fluctuation process of flow; the stress applied (Alexandrov-Eyring theory) influences characteristics of this process. Microscopic characteristics were obtained of deformation near δ y : activation energy ΔE o and shear volume of activation V sh . Values of V sh are 3000–3900 Å 3 and are comparatively low in relation to linear polymer glasses and activation energy values ΔE 0=51–71 kcal/mole. Values of ΔE 0 were higher than activation energies of segmental motion for the crosslinked polymer examined. It was shown that large-scale motion is only responsible for deformation near δ y . All results were explained within the framework of the hypothesis concerning the motion of “holes”—packing defects in the polymer examined.
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