Talk:Butyl rubber
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[edit] Variois polyisobutylene references
Waters, P.F. 2000. Global warming reduction by polymers in automobile fuels. American Chemical Society 220th national meeting. August 22-24. Washington, D.C.
Waters, P.F., and J.C. Trippe. 2000. New concepts in octane boosting of fuels for internal combustion engines. American Chemical Society 220th national meeting. August 22-24. Washington, D.C.
Graham Swift G.S. Polymer Consultants 215 Winged Foot Drive Blue Bell, PA 19422
Paul F. Waters Department of Chemistry American University 4400 Massachusetts Avenue, N.W. Washington, DC 20016
http://ehp.niehs.nih.gov/members/1994/Suppl-4/hammerle-full.html
http://deq.mt.gov/CleanSnowmobile/solutions/fuels/summareynp.pdf
EPA GE Case Studies. Polyisobutylene...in automobile emissions and improvements in gas mileage were observed as a result of using lightweight ... For straight oil fluids, polyisobutylene (PIB) can be added to control mist ...www.epa.gov/opptintr/greenengineering/case_studies.html
[edit] Polyisobutylene in fuel
While researching the claims made by an individual who sells polyisobutylene as a fuel mileage enhancer, I found that PIB is used as a detergent additive in gasoline and diesel fuel and has some interesting properties related to oil dispersion. The material I added is easily verifiable; just read the articles I linked to. I am somewhat concerned that posting this limited factual information could lead to exploitation by certain persons, however, I don't think that's a good reason to ignore the information.
However, continue to beware claims of miraculous gas mileage increases. The studies cited above do not support claims of improved fuel mileage. They report that PIB as an additive to fuel reduces some emissions and reduces fuel injector build-up, but none of the reports say anything about fuel mileage. Furthermore, as BASF has been marketing polyisobutylene as a gasoline additive since before 2000, it's probably already in your gas, so why buy it by the bottle on top of what you already pay? Plus the fact that it is already in use proves that it doesn't extend mileage. Finally, I was alerted to the BASF connection by a radio talk show host's web site who alleged that the government was blocking BASF from importing PIB as part of a vast conspiracy of some kind. I actually did find the lawsuit; it is is a tarriff dispute. BASF says the PIB formula it manufactures overseas and imports should be classified as polyisobutylene (6.5% tarriff) but the US customs dept says it should be classified as a fuel additive (9.3% tarriff). That's the big conspiracy. Thatcher131 05:04, 13 February 2006 (UTC)
[edit] Confusion between polyisobutylene and butyl rubber
In my opinion this article mixes up the two different materials mentioned above. Butyl rubber (IIR) is a copolymer and an elastomer, Polyisobutylene (also called Polyisobutene (PIB)) however is a homopolymer and thermoplastic. I think the information given in this article concerning PIB should be moved to the already existing text Polyisobutene. How do you feel about this?
Regards NickFr 15:55, 19 October 2006 (UTC)
[edit] Merge
Seen the above discussion, it looks like the articles have to be merged, but I am not a polymer chemist. Could someone have a look into this? --Dirk Beetstra T C 09:57, 24 October 2006 (UTC)
It is correct that butyl rubber is polyisobutylene containing a third (unsaturated) monomer, in order to make the material crosslinkable. Otherwise polyisobutylene cannot be reacted into a network. However, polyisobutylene itself is NOT a thermoplastic; it is a rubber. Sometimes rubber after crosslinking is called an elastomer. So by this terminology, both butyl rubber and polyisobutylene are rubbers, but only the former could be an elastomer.
- The article presently states "Polyisobutylene is produced by polymerization of about 98% of isobutylene with about 2% of isoprene". That sounds a bit...off. Looks like the merge conflated two related but different things rather than giving a unified discussion of both of them:( DMacks (talk) 16:33, 20 December 2007 (UTC)
- I agree. Though I am not expert in this field I think two different materials are mixed up in this article. NickFr (talk) 22:30, 5 January 2008 (UTC)
[edit] Use in deodorant
Reading the article I am not sure what does in the Nivea Balance deodorant I bought the other day. Any suggestions? Benkeboy 19:00, 14 January 2007 (UTC)
[edit] Isoprene content
Is the isoprene serve as cross-linking unit, does it merely polymerize at one of its olefins (giving a linear polyethylene with vinyl sidechains), or does it polymerize as the diene unit (giving an linear unsaturated chain)? Everything I know about polymerization and such says "cross-linking", but a question on the Science Reference Desk asked about "hydrogenated polyisobutene" (listed as an ingredient in hand lotion). DMacks (talk) 10:59, 19 December 2007 (UTC)
