[Beefy_SAFC]

I have three elastomer structures as follows and I need to know more about the specifics of hydrogen sulphide attack on them.

1) The first is an NBR elastomer.  My understanding is that hydrogen sulphide will attack the double bond more readily, leading to the development of sulphur crosslinks.   Is this correct?

Hydrogen sulphide in increased concentrations will also attack the nitrile sidegroup, however, I'm not sure of the outcome with this and need help here.   I'm tempted to guess it would become -CH2-NH2.   Or would it become another crosslinking site?



2) The second is a hydrogenated nitrile, with the double bond removed to reduce susceptibility to attack.   My question is for this is would hydrogen sulphide attack the nitrile sidegroup in the same way as for the standard nitrile in high concentrations?



3) The third is a fluoropolymer with a -CF3 sidegroup.   My understanding is that hydrogen sulphide would attack this sidegroup in a substitution reaction, leading to sulphur crosslinking.   Is this correct?   If it were not for the -CF3 sidegroup, I do know that the fluoropolymer would not be susceptible to hydrogen sulphide attack.



4) Will throwing carbon dioxide into the mix make things more reactive in each case?

5) Is there a good chemistry book or paper(s) somewhere that will give me this information?

This is for work and it's doing my head in to be honest.     The problem is there has been a changeover of staff at both my place of work and the principle suppliers, resulting in a loss of all the previous knowledge as no one wrote anything down.

This is enough to drive me to C2H5OH (I know, a crap joke)!!! 

Thanks and many regards,

Ian (Beefy_SAFC)

[Beefy_SAFC]

HELP, SOMEONE, ANYONE!!!