Radiation vulcanization of raw EPDM in the presence of polyfunctional monomers; diallylamine, diallylsulphide, ethylene glycol dimethacrylate, NN-methylene bis-acrylamide, triallyl cyanurate, trimethyloyl propane trimethacrylate and tetramethylol methane tetraacrylate has been carried out. The efficiency of the monomers studied in enhancing the crosslinking and the change in crosslinking density has been followed up by measurement of physical and mechanical properties of the vulcanized rubber. Also, the dependence of the properties of the loaded EPDM, with white and black fillers, on the type of filler has been examined.
The kinetics of iron deposition from acid solutions under steady‐state conditions have been studied using a rotating platinum disk electrode. The data obtained in the pH range between 1.8 and 3.8 can be explained on the basis of two reaction mechanisms. The noncatalyzed mechanism is applicable at
pH≤2.4
, while the catalyzed one is applicable at
pH≥3.3
. In between there is a transition from one mechanism to the other. Measurements of electrochemical reaction order as a function of the pH indicate the existence of the catalyzed mechanism at
pH≥3.3
. In this pH‐range the ferrous ion discharge takes place in the charge transfer region of the HER and consequently the pH at the electrode surface is the same as in the bulk of the solution. At
pH<2.4
such measurement shows that the pH at the electrode surface is different from that in the bulk of the solution. This is attributed to the fact that the ferrous ion discharge takes place at the onset of the transfer controlled region of the HER. These results are in good agreement with an earlier investigation on the iron deposition on a rotating gold disk electrode.
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