Isocyanate Reduction by Epoxide Substitution of Alcohols for Polyurethane Bioelastomer Synthesis
Table 1
Catalysts evaluation by extractable content method. A sample elastomeric wafer was a mixture of catalyzed ESBO (0.5% catalyst) and pMDI at 2 : 1 mass ratio then cured at 140°C/24 h in a convection oven.
Sample
Catalyst used
Extracted oil phase, %
Control
None
16.0
1
K2HPO4
17.2
2
Tin(II) 2-Ethylhexanoate
10.0
3
Triethanolamine
15.1
4
o-Phosphoric acid
2.85
5
Glycerol
15.6
6
1,4-diazabicyclo[]octane (DABCO) 8154
21.1
7
Polycat SA-1
22.6
8
DABCO BL-17
21.6
9
Propylamine
18.9
10
Propionamide
17.9
11
Octadecanamide
19.5
12
N-Methyl-N-nitroso-p-toluenesulfonamide (Diazald)
14.0
13
N-Bromo-succinimide
15.4
14
N,N-Dimethylformamide
15.9
15
KH2PO4
14.4
16
Calcium carbonate
15.1
17
n-Butanol
15.6
18
Methanol
16.2
19
Methanol + sulfuric acid
17.0
20
Perfluoric acid-PTF prepolymer
13.8
21
Cobalt acetate
15.2
22
Phthalic acid
13.1
23
Acetic acid
19.8
24.
Formic acid
11.3
25
p-Toluenesulfonic acid
11.0
26
Titanocene dichloride
10.2
27
1-Naphthol-3,6-disulfonic acid disodium salt hydrate
