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Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Elastin is Responsible for Tissue Elasticity01:12

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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
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IR Frequency Region: Alkyne and Nitrile Stretching01:22

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Both alkyne (C≡C) and nitrile (C≡N) functional groups contain triple bonds and show stretching absorptions around the wavenumber range of 2100 to 2300 cm−1 in the diagnostic region of the IR spectra.
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Polymers

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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Angle of Twist - Elastic Range01:13

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Related Experiment Video

Updated: Dec 14, 2025

Equibiaxial Stretching Device for High Magnification Live-Cell Confocal Fluorescence Microscopy
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Equibiaxial Stretching Device for High Magnification Live-Cell Confocal Fluorescence Microscopy

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Extremely Stretchable Vitrimers.

Zhenyu Lyu1, Tongfei Wu1

  • 1School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.

Macromolecular Rapid Communications
|July 22, 2020
PubMed
Summary
This summary is machine-generated.

New catalyst-free vitrimers exhibit superstretchability over 8900x, combining low glass-transition temperature polymers with dioxaborolane metathesis for advanced material applications.

Keywords:
covalent adaptable networksenergy dissipationself-healingsuperstretchabilityvitrimers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Network Polymers

Background:

  • Vitrimers are covalent adaptable networks with unique properties.
  • Developing vitrimers with enhanced stretchability and mechanical strength is crucial for advanced applications.

Purpose of the Study:

  • To develop catalyst-free superstretchable vitrimers.
  • To explore the potential of biodegradable xylitol-based polyol oligomers in vitrimer synthesis.
  • To investigate the energy dissipation capabilities of these novel vitrimers.

Main Methods:

  • Utilized a low-Tg polymer system combined with dioxaborolane metathesis.
  • Synthesized vitrimers from biodegradable xylitol-based polyol oligomers cross-linked by dioxaborolane linkages.
  • Characterized the mechanical properties, including stretchability, strength, malleability, and self-healing.

Main Results:

  • Achieved unprecedented stretchability exceeding 8900 times the original length at a moderate rate.
  • Demonstrated remarkable mechanical strength, malleability, self-healing, puncture resistance, and processing stability.
  • Observed efficient energy dissipation (up to 88%) due to dioxaborolane linkage and hydrogen bond rearrangements.

Conclusions:

  • Catalyst-free vitrimers exhibit exceptional superstretchability and robust mechanical properties.
  • Biodegradable xylitol-based vitrimers show significant potential for energy-absorbing applications.
  • The dynamic nature of dioxaborolane linkages and hydrogen bonds enables efficient energy dissipation and material adaptability.