The rate of grafting with DBHY is relatively slow compared to that of DBHA.
2 % DBHA, the mean residence time was determined to be 187 seconds.
Addition of DBHA causes significant drops of the melt viscosity of polypropylene compared to the original polymer.
Among the three peroxides employed, the degree of maleic anhydride grafting decreases in the following order--DBHY, DBHA, and BPO, which is in agreement with the order of their half-lifetimes.
6, the grafting rate with DBHA is the fastest and that with BPO should be slowest.
Thus, we can presume the reaction rate with DBHA is approximately twice as fast as that with DBHY.