Dicumene is a new type of polymer modified additive. Under certain temperature conditions, the chemical bonds between the quaternary carbon atoms in the molecular structure can be split into free radicals, which can induce the reaction of polymer macromolecules and produce various modification effects. However, the decomposition temperature is higher than that of peroxide or azo free radical initiator.
Based on this characteristic, there are two main uses for dicumene: the flame retardants of polymer materials, and the initiator of the graft and crosslinking of the polymer.
In the process of research and analysis, we put the HDPE (or EPDM) samples mixed with different proportions in the flat vulcanizing machine at 250 degrees C, and reacted in the melting state of the polymer, and the hot pressing time was thirty minutes. The gel content of the product was measured by refluxing 12h by boiling dimethylbenzene, and the change of relative viscosity in the toluene solution before and after the reaction was measured by the UFF viscometer.
It can be seen that the molecular weight change of polymer before and after reaction with dicumene. It is important to note that the thermal decomposition rate of the product and the dependence on the temperature are very important for its application in the polymer flame retardant system and the application of the polymer graft and crosslinking modification.
In fact, the effect of dicumene is mainly based on free radicals. Because of its high pyrolysis temperature, it can be used above 200 c, which is beyond the free polymerization temperature of ordinary monomers. So this product is generally not used for the initiation of radical polymerization, but for polymer modification.
In contrast, dicumene has the advantages of high temperature, good chemical stability, convenient storage, safe use and wide application.