Cha G.C.,Korea Orthophedics and Rehabilitation Engineering Center |
Song J.S.,Korea Orthophedics and Rehabilitation Engineering Center |
Lee S.M.,Korea Orthophedics and Rehabilitation Engineering Center |
Mun M.S.,Korea Orthophedics and Rehabilitation Engineering Center
Polymer (Korea) | Year: 2010
The physical properties of polymeric foams depend on the density of foams, physical properties of base polymers, the content of open cells, and cell structures including the size and its distribution, the shape of cell, and the thickness of skin layer. The foam density is affected by the chemistry of raw materials, the concentration of crosslinking agent and the blowing agent as well as the operating parameters during production process. In this study, the basic formulations of foams are composed of polyester polyol, MDI, amine catalyst, tin catalyst, silicone surfactant, and water. Crosslinking density of Polyurethane was increased by using chain extenders. Also, the mechanical properties of Polyurethane foam were improved by using the inorganic fillers (silica 1,2 and talc 1,2) having different SiO 2 contents and particle sizes. We investigated the properties of modulus, tensile strength, compressive strength and hardness of foams obtained by changing kind of inorganic filler and chain extender, and observed the distribution of inorganic filler as well as variation of cell size within the foams by electron microscopy.