Synthesis and Properties of Imidazole-Blocked Toluene Diisocyanates |
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| Authors: | A Sultan Nasar S N Jaisankar S Subramani Ganga Radhakrishnan |
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| Institution: | Polymer Division , Central Leather Research Institute Adyar , Madras, 600 020, India |
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| Abstract: | Abstract Imidazole-, 2-methyl imidazole-, and benzimidazole-blocked toluene diisocyanates (TDI) were prepared and characterized by elemental analysis, IR, and NMR spectroscopy. Simultaneous TGA/DTA results showed that the thermal stability of the adduct decreases in the following order: imidazole-TDI > 2-methylimidazole-TDI > benzimidazole-TDI. Gelation test involving imidazole-blocked adducts and hydroxyl-terminated polybutadiene were also carried out. The cure rate of the adduct increases from the imidazole- to the 2-methylimidazole- and to the benzimidazole-blocked adduct. It is also found that the benzimidazole-blocked adduct shows better solubility in the polyols. |
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| Keywords: | Imidazole Toluene diisocyanate (TDI) Blocked isocyanate Hydroxyl-terminated polybutadiene (HTPB) Gel time Thermal dissociation |
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