International. A study by Polish researchers provides information on the thermal behavior and flame delay of high-content polyurethane coatings in solids modified with cyclophosphaene.
Hexakis (2,3-epoxypropyl) cyclotriphosphazene was used for the preparation of highly solid organic and inorganic hybrid poly (urethane-cyclophosphaene) coatings based on epoxy-finished urethane oligomers that were cured with ethylenediamine.
The flame delay, thermal degradation behavior and some surface properties of the coatings were investigated. The results of the thermogravimetric analysis suggested that the thermal degradation of poly (urethane-cyclophosphazene) occurred in two main stages and the introduction of cyclophosphazene resulted in an increase in thermal stability. The main gases released during the thermal decomposition of the samples were carbon dioxide, ammonia, water and tetrahydrofuran.
Microscale combustion calorimetry revealed that the maximum specific heat release rate and heat release capacity of hybrid materials decreased significantly with the incorporation of cyclotriphosphazene. The angle of contact with water and brightness decreased while the hardness increased with the increased contribution of hexakis (2,3-epoxypropyl) cyclotriphosphazene in the coating.
Source: www.sciencedirect.com
