| 초록 |
We investigated the effects of the various types of additives, as nucleating agent, on the properties rigid polyurethane foams. PUFs were synthesized from polyether polyols, polymeric 4,4’-diphenylmethane diisocyanate, silicone surfactant, amine catalysts, distilled water and cyclopentane as blowing agents. Properties of the PUFs were obtained by thermal conductivity analyzer and scanning electron microscopy and universal testing machine. In order to find the effect of various types of additives, four different additives were used. From the results, when the liquid type additive was added, the cell size and the thermal conductivity of the PUFs found to decrease compared the PUFs added solid type additive. Moreover when the hydrophilic solid additive was added, thermal conductivity and the cell size of the PUFs were decreased. |
