Effect of isocyanate modification of rice husk as a filler on the properties of rigid polyurethane foam

Natural fillers can be used as renewable and low cost resources in a variety of materials to reduce costs and enhance product properties such as density and mechanical properties. Since large amount of hydroxyl groups in their structures, these materials show the high tendency to absorb moisture from the environment, which will limit their use due to biological degradation and loss of dimensional stability in the long term. The rice husk is one of the natural materials which is formed as a by-product from the rice industry. In this study, toluene diisocyanate (TDI) is used for chemical modification of rice husk. The mechanical and physical properties of the foam filled with unmodified and modified rice husks were investigated by density and compression tests. The foam insulation properties also studied by thermal conductivity analysis (TCA) method.

کلیدواژه ها:

Rigid Polyurethane Foam ، Rice husk ، modification ، isocyanate