Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: alternative spandex monomers
xxxxx
Hazard to Others
***




Posts: 116
Registered: 21-5-2004
Member Is Offline

Mood: No Mood

[*] posted on 14-5-2008 at 15:05
alternative spandex monomers


currently spandex is produced by reacting nylon monomers with phosgene and adding a glycol to the diisocyanate groups which are formed. the disadvantage to this process is that the carbonyl group from the phosgene is included in the polymer as an amide ester of carbonic acid which is the weakest link in the polymer as it is the most easily hydrolysed. indeed carbonic acid does not exist at standard temperatures and pressures, but decomposes spontaneously to form carbon dioxide and water.
this is demonstrated by spandex being decomposed by body acids such as butric acid over comparatively short periods of time.
i would like to propose reacting 1,6 diamino hexane with 6 hydroxy hexanoic acid to form a trimer ho-c5h10-co-nh-c6h12-nh-oc-c5h10-oh, which is then reacted with adipic acid to complete the polymer chain.
View user's profile View All Posts By User

  Go To Top