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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Molecular Weight of Step-Growth Polymers01:08

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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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
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Polymer Classification: Architecture01:14

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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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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Plastic Behavior01:21

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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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Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Tuning the Properties of Multi-Stable Structures Post-Fabrication Via the Two-Way Shape Memory Polymer Effect.

Giada Risso1, Max Kudisch2, Paolo Ermanni1

  • 1Laboratory of Composite Materials and Adaptive Structures, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092, Zürich, Switzerland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel reconfigurable structures using multi-stable elements and two-way shape memory polymers. These adaptive structures allow post-fabrication shape tuning and controlled multi-stability for enhanced load-bearing capabilities.

Keywords:
adaptive structuresmulti‐stabilityreprogrammable structuresthin‐ply composite

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Polymer Science

Background:

  • Multi-stable elements are crucial for reconfigurable and adaptive structures, offering large shape changes and self-locking.
  • Current multi-stable structures lack post-fabrication tunability, limiting their adaptability.
  • Shape memory polymers (SMPs) offer shape-changing capabilities but often lack controlled multi-stability.

Purpose of the Study:

  • To introduce a novel design combining multi-stable structures with two-way shape memory polymers.
  • To demonstrate post-fabrication control over shape, stiffness, and multi-stability.
  • To enhance the adaptability and load-bearing capacity of reconfigurable structures.

Main Methods:

  • Integration of multi-stable elements with two-way shape memory polymers.
  • Application of bi-axial strain to leverage one-way and two-way shape memory effects.
  • Experimental validation of shape reprogramming, load bearing, and self-actuation.

Main Results:

  • Demonstrated post-fabrication tuning of structure shape and stiffness.
  • Achieved on-command suppression or activation of multi-stability.
  • Showcased enhanced load-bearing capability compared to conventional multi-stable systems.
  • Prevented undesired snapping through controlled multi-stability.

Conclusions:

  • The novel design enables adaptable mechanical structures with user-defined properties.
  • The approach allows structures to reversibly switch between mono- and multi-stable states.
  • Potential for temperature-induced shape changes and enhanced functionality in adaptive systems.