| 초록 |
Foams made from Homo polypropylene (PP) and waste ground rubber tire powder and compatilizer blends, using azodicarbonamide as a chemical blowing agent, have been investigated to establish a relationship between the structure and physical properties. The blends of PP, waste ground rubber tire powder (WGRT), compatilizer, chemical blowing agent were prepared on Brabender mixer and two roll mill. Subsequently, foamed structures of the blends were obtained by a single stage compression moulding. Results indicate that foaming process variables, i.e. heating time, blowing agent loading, ratio of PP/WGRT, crosslinking agent loading, and ratio of PP/WGRT, affect the physical properties of the foams. The properties of foam like density, hardness, tensile strength,elongation at break, elastic modulus have been investigated. The foam structure was investigated using SEM, in terms of the average cell size and its distribution. |
