Research Article
Isocyanate Reduction by Epoxide Substitution of Alcohols for Polyurethane Bioelastomer Synthesis
Table 3
Chemical properties of o-H3PO4-reacted ESBO (at RT) without solvent or alcohol source.
| | Sample code | % o-H3PO4 based on ESBO | Acid value, mg KOH/g
(±0–5%) | % Oxirane oxygen
(±0.2–3%) | AOCS Hydroxyl value, mg KOH/g(±2–4%) | ASTM Hydroxyl Value, mg KOH/g
(±0.3–5%) | Viscosity, cP
(±0.2–1%) |
| | Control | 0 | <0.20 | 7.06 | 11.0 | 404 | 362 | | A | 0.5 | 0.77 | 6.77 | 23.0 | — | 559 | | B | 1.0 | 0.89 | 6.30 | 32.2 | — | 1020 | | C | 1.5 | 0.95 | 5.34 | 38.4 | 240 | 3950 |
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