ポリウレタン系形状記憶ポリマーフィルムのクリープおよび応力緩和特性

概要

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Basic properties of creep and stress relaxation in a film of shape memory polymers of polyurethane series above and below the glass transition temperature T_g were investigated experimentally. The results are summarized as follows. Modulus of elasticity, yield stress and 100% modulus are large below T_g but small above T_g. The relationships between normalized stress at each temperature and creep strain almost coincide without depending on temperature. Creep strain above T_g recovers after unloading but creep strain below T_g does not recover. Irrecoverable creep strain which remains below T_g recovers at temperatures in the vicinity of T_g during the heating process. A half of initial stress decreases under constant strain after a certain duration of time for each temperature and strain. The ratio of relaxed stress to initial stress increases with an increase in strain below T_g. The deformation properties of the materials with different T_g are almost same except for difference in T_g.
社団法人日本機械学会の論文
1996-07-25