ビーズ法ポリスチレンフォームの圧縮弾性率に及ぼす気泡破壊の影響

概要

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Effects of cell destruction on compression moduli of five expanded polystyrene foams were studied by the static compression test and the dynamic viscoelastic measurements in compression mode. In the static compression test, stress-strain curves of virgin foams gave a bend in the small strain region but exhibited no yield behavior as observed for hard polyurethane foams, whereas the stress monotonically increased with strain for foams whose cells were artificially destroyed. It is considered that cells are rapidly destroyed in the bend region without breakage of the entire foam in contrast to slow cell destruction of hard polyurethane foams. In comparison of the static compression modulus obtained from the initial slope of the stress-strain curve at the strain of 0.04 with the dynamic compression modulus, the former has been found to correlate with the latter positively in two types of foams before and after destruction of cell, and the latter is larger than the former. The appearance of the viscoelastic behavior of natural open-celled foams is considered to be difficult because of the buckling more easily than hard polyurethane foam.
2001-09-01