Cellulose Urethane (Carbamate) Flashcards
1
Q
steps
A
1) cellulose + CH3(CH2)15NCO; 1º OH Nu atks carbon of NCO
2) proton exchange reforms CO double bond and makes N-H
2
Q
cellulose urethane
A
waterproof fabric that is NP/hydrophobic
3
Q
what is diisocyanate is used
A
get cross-linking between cellulose chains
thermoset resin
need 2 different cellulose chains
wrinkle-free AND waterproof
4
Q
gortex
A
not cellulose based
polytetrafluoroethylene (Teflon, PTFE)
5
Q
gortex properties
A
waterproof laminated system
breathable - small well defined holes
H2O droplet too big to pass through jacket
6
Q
gotex laminated system
A
inbetween teflon are thin hydrophobic fibers of woven nylon, polyurethane layers
7
Q
urethane f.g
A
R-O-C=O-NH-R’
