Isocyanate Reduction by Epoxide Substitution of Alcohols for Polyurethane Bioelastomer Synthesis

Table 2

Chemical properties of ESPs using two different mixing sequences. The Gardner color indices of the samples range from1 to 3. All reacted samples composition: 1 : 1 by wt ESBO and CO. “Separate” indicates that acid reaction was done first before alcohol addition while “Simultaneous” that indicates acid and alcohol reactions were done at the same time.

% o-H3PO4based on ESBO	Acid value, mg KOH/g; (±0–5%)	Viscosity, cP; (±0.2–1%)	%Oxirane oxygen; (±0.2–3%)	AOCS Hydroxyl value, mg KOH/g; (±2–4%)
Control
0	1.54	434	3.44	84.10
Separate
0.5	1.75	501	3.22	84.30
1.0	1.65	665	3.12	89.56
2.0	1.63	1240	2.69	95.36
Simultaneous
0.5	1.90	507	3.30	87.70
1.0	1.80	660	3.04	89.30
2.0	1.90	1100	2.73	98.24