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Related Concept Videos

Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Shape Memory Polymers for Active Cell Culture
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High Cycle-life Shape Memory Polymer at High Temperature.

Deyan Kong1, Xinli Xiao1

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin 150001, PRC.

Scientific Reports
|September 20, 2016
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Summary
This summary is machine-generated.

This study introduces a novel shape memory polyimide demonstrating exceptional durability over 1000 bending cycles. This advanced shape memory polymer (SMP) maintains high shape fixity and recovery, paving the way for expanded applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Mechanical Engineering

Background:

  • Shape memory materials require high cycle-life for practical applications.
  • Existing shape memory polymers (SMPs) often degrade over numerous deformation cycles.

Purpose of the Study:

  • To develop and characterize a novel shape memory polyimide with enhanced cycle-life.
  • To investigate the mechanisms behind the material's high shape fixity and shape recovery over extended use.

Main Methods:

  • Fabrication of a novel polyimide-based shape memory material.
  • Mechanical testing involving over 1000 bending cycles at elevated temperatures.
  • Analysis of material properties including shape fixity, shape recovery, critical stress, and stored energy.

Main Results:

  • The shape memory polyimide maintained high shape fixity (Rf) and shape recovery (Rr) over 1000 bending cycles.
  • Achieved critical stress of 2.78 MPa at 250°C, with shape recovery producing 0.218 J g⁻¹ stored energy at 31.3% efficiency.
  • High Rf attributed to a large storage modulus difference; high Rr linked to strong π-π interactions and chain entanglements in the permanent phase.

Conclusions:

  • The developed shape memory polyimide exhibits excellent cycle-life, preserving key performance metrics.
  • The robust permanent phase and significant modulus difference contribute to sustained high shape fixity and recovery.
  • This high cycle-life SMP demonstrates potential for significantly expanded application areas.