Shape Recovery and Secondary-Shape Forming in Polyurethane-Shape Memory Polymer
  • 【摘要】

    The influence of the strain-holding conditions on shape recovery and secondary-shape forming was investigated. The results obtained are summarized as follows. (1) If strain is held at holding temperat... 展开>>The influence of the strain-holding conditions on shape recovery and secondary-shape forming was investigated. The results obtained are summarized as follows. (1) If strain is held at holding temperature T_h = T_g+20K in a short time, irrecoverable strain starts to appear at the holding time t_h= 0.5h and strain is not recovered at all at t_h=8h. In the case of T_h = T_g+10K, irrecoverable strain appears in a short holding time if holding strain is large and the rate of secondary-shape forming S is 42 percent at t_h=8h. (2) If strain of 50 percent is held at T_h = T_g+10K in a long time, strain becomes not to be recovered and S is 93 percent at t_h, =12h. In the case of T_h = T_g, the increasing rate of S increases if t_h is longer than 40h. If T_h is lower than T_g-10K for t_h,= 72h, strain is recovered perfectly by heating and secondary-shape forming does not appear. 收起<<

  • 【作者】

    H. Tobushi  Y. Ejiri  S. Hayashi 

  • 【语种】

    eng

  • 【会议名称】

    Engineering Plasticity and Its Applications from Nanoscale to Macroscale: Part 2

  • 【会议地点】

    Nagoya University, Nagoya, Japan

  • 【会议时间】

    2006-01-01

  • 【关键词】

    Shape memory polymer  Shape recovery  Shape fixity  Secondary-shape forming  Polyurethane  Strain-holding condition