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Green Polyurethane™ Technical Description

The number and scope of polyurethane-based material applications have increased significantly compared to other thermosetting polymer materials. Nevertheless, despite the favorable mechanical properties of conventional monolithic polyurethanes, they are still porous, possess poor hydrolytic stability and insufficient permeability. Furthermore, the addition of toxic components in the formulation of monolithic polyurethanes, such as isocyanates, makes their production extremely toxic and dangerous.

Polyurethanes also have inherent weaknesses due to their molecular composition. Within the polymer structure of polyurethanes are hydrolytically unstable bonds that make it vulnerable to environmental degradation. By modifying the structure of the polymer, NTI has introduced a promising new method of raising hydrolytic stability as demonstrated in its non-isocyanate Green Polyurethane™ — a modified polyurethane material with lower permeability, increased resistance properties and safer fabrication process as compared to conventional PU.

NTI's network non-isocyanate polyurethanes are formed as a result of the reaction between cyclocarbonate oligomers and primary amine oligomers. This reaction forms an intra-molecular hydrogen bond through the hydroxyl group at the -carbon atom of the polyurethane chain as illustrated below:


Quantum-mechanical calculation, IR and NMR spectroscopic investigations have confirmed the stability of such intra-molecular hydrogen bonds. The blockage of carbonyl oxygen considerably lowers the susceptibility of the whole urethane group to hydrolysis. Moreover, materials containing intra-molecular hydrogen bonds display a chemical resistance, which is 1.5-2 times more than materials of similar chemical structure without such bonds.

The above Green Polyurethane™ structure, due to its chemical similarity to conventional polyurethanes, and also to epoxies, also warrants the use of the term 'hybrid' in its name: "hybrid non-isocyanate polyurethane." Polyoxypropylene triols and epoxydized vegetable oils are used as raw materials for the preparation of Green Polyurethane™.

Isocyante Toxicity Facts

OSHA Link on Isocyanates

Hazzardous Substance Fact Sheet for Isocyanates