ポリウレタン系形状記憶ポリマーフォームの形状固定性と形状回復性(<特集>材料の内部構造と力学特性)

概要

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The thermomechanical properties of polyurethane-shape memory polymer foam were investigated experimentally. The results obtained are summarized as follows. (1) By cooling the foam after deformation at high temperature, stress decreases and the deformed shape is fixed. Stress decreases markedly in the region of temperature below the glass transition temperature T_g during the cooling process. (2) By heating the shape-fixed foam under no-load, the original shape is recovered. Strain is recovered markedly at the temperature region in the vicinity of T_g. (3) The ratio of shape fixity is 100% and that of shape recovery 98%. Both ratios do not depend on the number of cycles. (4) Recovery stress increases by heating under constraint of the fixed shape. Recovery stress is about 80% of maximum stress. Relaxed stress at high temperature is not recovered. (5) The shape deformed at high temperature is maintained for six months at T_g-60 K under no-load without depending on maximum strain, and the original shape is recovered by heating. (6) If the deformed shape is kept at high temperature, the original shape is not recovered. The factors to influence the shape irrecovery are strain, temperature and time during keeping the deformed shape.
社団法人日本機械学会の論文
2002-11-25