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Smart polyimide with recovery stress at the level of high temperature shape memory alloys

机译：智能聚酰亚胺，具有恢复应力在高温形状记忆合金的水平下

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摘要

Recovery stress is important for smart shape memory materials (SMMs) and low recovery stress of shape memory polymers hinders their applications badly, while high temperature shape memory alloys (HTSMAs) are very difficult to be obtained. In order to obtain high temperature SMM with high recovery stress, convenient preparation methods, low cost and good workability, shape memory polyimide with high recovery stress (HRSMPI) at the level of HTSMA is prepared by reinforcing smart polyimide matrix with carbon fiber cloth (CFC) in common lab furnace. The HRSMPI possesses unique sandwich structure with good interfacial bonding between the matrix and filler. It exhibits high glass transition temperature of 300 degrees C, shape fixity of 90.6% and shape recovery of 92.2%. The recovery stress of HRSMPI is 116 MPa, close to those of some HTSMAs. The primitive actuator made of HRSMPI can overturn metal sheet 147 times heavier than itself, similar to the commercial TiNiHf HTSMA. Meanwhile, its density is 0.96 g cm(-3), less than 1/6 of that of TiNiHf. The elastic strain energy is mainly stored in CFC and then released as recovery stress under constrained shape recovery, and HRSMPI has great potential in practical applications.
机译：None

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  • 来源
    《Smart Materials & Structures》 |2021年第3期|共11页
  • 作者

    Kong Deyan; Li Jie; Guo Anru; Yu Jianxin; Xiao Xinli;

  • 作者单位

    Harbin Inst Technol Sch Chem &

    Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers 92 West Dazhi St Harbin 150001 Peoples R China;

    Aerosp Res Inst Mat &

    Proc Technol 1 South Dahongmen Rd Beijing 100076 Peoples R China;

    Aerosp Res Inst Mat &

    Proc Technol 1 South Dahongmen Rd Beijing 100076 Peoples R China;

    Harbin Inst Technol Ctr Anal &

    Measurement 92 West Dazhi St Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem &

    Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers 92 West Dazhi St Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 智能材料;
  • 关键词

    shape memory polymer; recovery stress; high temperature; shape memory alloy; polyimide; carbon fiber cloth;

    机译：形状记忆聚合物;恢复应力;高温;形状记忆合金;聚酰亚胺;碳纤维布;

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