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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Shape Memory Polymers for Active Cell Culture
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Modulation of Interfacial Adhesion Using Semicrystalline Shape-Memory Polymers.

Soyoun Kim1, Sanjay Lakshmanan2, Jinhai Li1

  • 1Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 9, 2022
PubMed
Summary
This summary is machine-generated.

Shape-memory elastomers with controlled features enable tunable adhesion for precise contact printing. Releasing stored elastic energy allows for automatic separation of substrates, optimizing ink transfer processes.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • Semicrystalline shape-memory elastomers offer tunable properties for advanced applications.
  • Controlling adhesive interactions is crucial for micro/nanoscale printing and manufacturing.

Purpose of the Study:

  • To investigate the use of semicrystalline shape-memory elastomers for controlled adhesion and delamination.
  • To explore the relationship between elastomer deformation, phase behavior, and interfacial forces.

Main Methods:

  • Molding semicrystalline shape-memory elastomers into specific geometrical features.
  • Mechanically and thermally controlling elastomer deformation and phase transitions.
  • Analyzing interfacial contact area and adhesive forces with a glass substrate.

Main Results:

  • Deformed elastomer features store elastic energy in their semicrystalline state.
  • This stored energy can be released to overcome interfacial attractive forces.
  • Automatic separation of the glass substrate from the elastomer was achieved.

Conclusions:

  • Shape-memory elastomers provide a mechanism to actively control adhesion and delamination.
  • These materials show significant potential for applications in contact printing, including ink pickup and transfer.
  • The findings enable precise control over adhesive forces in printing processes.