Viscoelastic properties of carboxyl-terminated (butadiene-co-acrylonitrile)-based composite rocket propellant containing tris (2,3-epoxypropyl) isocyanurate as bonding agent

Abstract

). The dynamic mechanical analysis showed that the tris(2,3-epoxypropyl) isocyanurate content did not affect the glass transition temperature of the tested propellants

Effect of tris (2,3-epoxypropyl) isocyanurate on dynamic modulus of CTBN-based composite rocket propellant

“…The results are reported in our previous papers [6][7][8][9]. Regarding the loss factor evolution according to the temperature, it was observed that all the tested materials have shown two relaxation processes.…”

“…At the maximum intensity of the tan(δ), the molecular rearrangement process from glassy to rubbery and vice versa is at its maximum. These values were reported in our previous paper [9].…”

“…Both the tensile strength and Young's modulus increased with increasing the TEIC content. Maximum values of these characteristics are recorded for 0.3 wt.%, of TEIC [9]. Formation of hydrogen bonds between the TEIC as a part of a polymer network on one side, and ammonium−perclorate particles on the other side can be a reason for the mobility restrictions.…”

“…The first peak of the loss factor curve is attributed to the main glass transition temperature in the soft−segment regions (CTBN main chain elements) where the main chain molecular motion ceases or starts. The second peak in tan(δ) that appears at a much higher temperature is referred to as the glass transition of the mobility restricted segments (T g restricted ) and it is assumed to be related to the filler−binder interactions [9,25]. The different nature of the two observed relaxation mechanisms is reflected in the values of E a .…”