| dc.description.abstract | The application of PU foam depends on the density. PU foam can apply on insulation,packaging and load-bering.
Because of bening intereasted in physical properties and structures of PU foam, the study of changing component and process to understand the relationship between materials and structure is the important point in the study.
The synthesis process of PU foam is one-shot process. This process is two component system. One stream is MDI, the other contains polyisoprene and additives like catalysts, chain extender, foaming agent, surfactant and filler. The variables of the experiment contains amount change of hard-segment, water, surfactant, catalyst, filler. The other two variables are change of density and mole fraction change of blending PTMO and polyisoprene. The test method of the foam contain tensile strength ,tear strength, split tear strength, hardness, compression set.
The density, the amount of catalyst, water, surfactant, filler, PTMO and different kind of surfactant can influence the size of the foam bubble.
The result of test shows the tensile, tear, split tear strength and hardness properties of the foam are more strong when increasing the density of the foam without changing other variables and process. The tensile, tear, split tear strength and hardness properties of the foam are more strong when increasing the hard-segment content of the foam without changing other variables and process. The tensile, tear, split tear strength properties of the foam show up first then down when increasing the amount of catalyst of the foam without changing other variables and process. Increasing the amount of water of the foam without changing other variables and process shows the split tear strength and hardness properties are more strong, but decreases the resistance to compression. Different kind of surfactant also can influence properties of the foam. Increasing the amount of surfactant of the foam without changing other variables and process shows that the elongation and resistance to compression of the foam can increase. The tensile, tear, split tear strength and compression set properties of the foam show up first then down when increasing the amount of filler of the foam without changing other variables and process. Increasing the amount of PTMO on the polyisoprene foam without changing other variables and process shows the tensile, tear, split tear strength and elongation properties of the foam are more strong, but resistance to compression decreases. The tensile, tear, split tear strength properties of the blending PTMO/POLY IP 75% mole fraction foam are less strong when increasing the amount of COE-210T surfactant without changing other variables and process. | en_US |