Question
Asked 29th Sep, 2017
  • Nirumand Polymer Pars

Reaction mechanism of vulcanization acceleratored by Benzothiazole Sulfenamide?

There are many different mechanism proposed in the literature. The mechanism shown in the figure is accepted by many authors. The question is how two hydrogen atom supplied to form MBT and Cyclohexylamine from CBS?  

All Answers (2)

Nizar Matar
An-Najah National University
Obviously, the first cleavage step required adding 2H. The second combination step b/w MBT & CBS involved elimination of cyclohexylamine "from CBS" but the H in (-SH) of MBT has gone to form full molecule of the amine.
There are hydrogenation/dehydrogenation reactions in the first two steps. What surprised industrial organic chemists that dehydrogenation, like hydrogenation, is enhanced by the presence of hydrogen right from the start.
Afshin Tavasoli
Nirumand Polymer Pars
Thank you Professor Matar
As we know the rubbery parts usually vulcanized in compression molding process, and they are not in presence of hydrogen. So how the first step occurs when there is no hydrogen supplier in the curing process?

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Hi,
Can someone kindly help me to download the supplementary file from the paper published in Chemical Engineering Journal.
I could not seem to locate where the supplementary file is actually located in the website. Other publishing house like ACS or RSC keep these fie as a pdf link, which are easy to locate. Does Elsevier provide these file free of cost?
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