A new latent catalyst, based on 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), was specifically designed to be thermally deprotected at low temperature. In particular, specific isocyanurates based on the reaction of two substituted isocyanates with DBN are used as precatalysts for polyurethane (PU) synthesis. The activation temperature of the precatalysts is determined by differential scanning calorimetry, and the activity of the resulting free catalyst is demonstrated through a catalytic cycle on a PU model reaction. A new thermally latent cocatalyst, based on 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), has been specifically designed for “on-demand” synthesis of polyurethanes in the presence of DBTL as catalyst. This nitrophenyl-based isocyanurate cocatalyst exhibited a low cleavage temperature keeping the system almost inactive at 20 °C and allowing fast polymerization only after increasing temperature up to 60 °C by the release of active DBN.

中文翻译：

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用于按需聚氨酯合成的低温氨基催化剂活化

一种基于 1,5-二氮杂双环 [4.3.0] 非 5-烯 (DBN) 的新型潜在催化剂专门设计用于在低温下进行热脱保护。特别是，基于两个取代异氰酸酯与 DBN 反应的特定异氰脲酸酯用作聚氨酯 (PU) 合成的预催化剂。预催化剂的活化温度由差示扫描量热法确定，所得游离催化剂的活性通过 PU 模型反应的催化循环来证明。一种基于 1,5-二氮杂双环 [4.3.0] 非 5-烯 (DBN) 的新型热潜助催化剂专门设计用于在 DBTL 作为催化剂存在下“按需”合成聚氨酯。