Properties of materials effect of thiokol on properties of epoxy polymers

The influence of preliminary thioetherification reaction on properties of epoxy adhesives modified by liquid thiocol

“…It has been established [1][2][3] that, in the case of composites cured without heat input from outside, i.e., when a quite large amount of rubber should be added in order to achieve maximal values of the adhesion strength at room temperature (about 60 wt %/100 wt % of epoxy oligomer), which, consid ering the high cost of thiocol, leads to a quite signifi cant rise in the cost of the material. In addition, with such a large content of the modifier, the cohesive strength, modulus of elasticity, and water and wear resistance significantly decrease in comparison with the basic epoxy polymer.…”

“…By analogy with liquid oligobutadiene rubbers with end carboxyl groups [4][5][6], it was assumed that this disadvantage can be avoided if there is preliminary carrying out (before introduction of a curing agent) of the interaction reaction of mercaptan groups and oxirane cycles at the elevated temperature and, then, the product of this thioetherification reaction is used as the resin part for curing at room temperature: According to data [3] obtained with the use of dif ferential scanning calorimetry, such interaction occurs in a wide temperature interval of 80-180°C.…”