Sharovatova T. V., Nesterova E. Yu., Posudiievska O. R.
Oles Honchar Dnipropetrovsk National University
INFLUENCE OF PLASTICIZER ON THE PROCESS OF STRUCTURING A CARBOXYLATE RUBBER –EPOXY RESIN SYSTEM
Nowadays we observe wide application of terminal oligomeric rubbers with side carboxyl groups. Besides sufficiently high chemical resistance, rubbers are characterized by excellent deformation properties. However, they have low hardness, low thermal resistance and adhesion. The introduction of the epoxy component into the rubber leads to the improvement of dynamic endurance, physical, mechanical and performance properties of the rubbers.
This work is devoted to the development of new catalysts of combustion rate with plasticizing properties based on the modified ricinus oil and ferrocene derivatives, as well as to the research of their effect on the kinetics of curing of the system rubber SKN-10-KTR – epoxy resin ED-20.
We have developed a technique to obtain a combustion catalyst with the properties of plasticizer based on the product of glycerolizes of ricinus oil and ferrocenyl carbonic acid (MRO). Using the method of DSC we showed high plasticizing capacity of MRO. It is found out that during its introduction into the rubber of «SKN-10-KTR» type glass transition temperature of the rubber undergoes a significant shift to the range of lower temperatures. The kinetics of curing reaction in the system «carboxylate rubber SKN-10-KTR epoxy resin ED-20» was studied. The investigation showed that the reaction is bimolecular, this process conforms to the kinetic equation of a second-order reaction and has mainly the first order in each reactant. It was found out that the constant of reaction rate has its maximum value at a ratio of «rubber: epoxy resin = 1:2». It is shown that the MRO as a plasticizing addition in the rubber system «SKN-10-KTR – epoxy resin ED-20» has the greatest influence on the reaction capacity of the ruber and does not affect the disclosure rate of epoxy groups. More detailed research was carried out on the kinetics of curing reaction in the system «SKN-10-KTR – ED-20 «at a ratio of 1:2 at different temperatures (70, 80, 90, 100, 110). We have also studied the kinetics of curing reaction in the system «SKN-10-KTR – ED-20 – FMKM (7 % and 4 %)» at different temperatures (70, 80, 90, 100, 110), as well as in the system «SKN-10-KTR – ED DOS – 20 (7 % and 4 %)» at different temperatures (70, 80, 90, 100, 110), at a ratio of rubber: epoxy resin = 1:2.