Abstract
Components of polyurethane synthesis are tested for their ability to bind pine wood into boards and are compared to the efficiency of using only the isocyanate component of polyurethane synthesis. A variety of polyols are tested varying equivalent weight, functionality, reactivity as determined by the availability of primary hydroxyl endgroups, and viscosity. The boards are fabricated at a variety of densities and under a variety of conditions. The results show that board properties using only the isocyanate component are always superior to those including a polyol component, but the board properties are not always a simple function of the amount of isocyanate put in the board. Furthermore, it is observed that the lower the room temperature surface tension between the polyol and isocyanate, the better the measured board properties; but, the higher the observed surface tension, the better the board will self-release from the metal caul plates.
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