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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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Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
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Social psychologists analyze how groups influence one another, shaping social structures and interactions through both cooperation and competition. These dynamics manifest in various ways, ranging from economic partnerships to intergroup conflicts that shape societal structures and perceptions.Cooperation and Competition in Intergroup RelationsIntergroup relationships vary across contexts, sometimes fostering cooperation and mutual benefit while at other times leading to conflict and...
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Imaging Biological Samples with Optical Microscopy01:18

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Impact01:30

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging.

Georgy A Filonenko1, Jody A M Lugger2, Chong Liu1

  • 1Inorganic Systems Engineering group, Department of Chemical Engineering, Delft University of Technology, 2629, HZ, Delft, The Netherlands.

Angewandte Chemie (International Ed. in English)
|September 6, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to observe how polymers break down under stress. This technique tracks mechanical impact in different polymer phases, offering insights into material behavior and design.

Keywords:
copperluminescencemechanical propertiesmolecular dynamicspolymers

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Area of Science:

  • Polymer Science
  • Materials Science
  • Mechanical Engineering

Background:

  • Structural heterogeneity is key to polymer properties and mechanical performance.
  • Characterizing complex polymer heterogeneity is challenging, hindering rational material design.

Purpose of the Study:

  • To present a practical methodology for resolving mechanical behavior in discrete polymer phases.
  • To track energy dissipation, restructuring, and breakdown during mechanical impact in segmented polyurethane.

Main Methods:

  • Utilized direct optical imaging of photoluminescence.
  • Employed a small-molecule organometallic mechano-responsive sensor.
  • Observed real-time polymer phase evolution under mechanical impact.

Main Results:

  • Successfully observed and tracked energy dissipation and phase restructuring in real-time.
  • Provided detailed insights into the breakdown mechanisms of polymer phases.
  • Demonstrated the method's ability to resolve heterogeneity-driven mechanical responses.

Conclusions:

  • The developed methodology offers a robust and simple approach for characterizing complex soft-matter systems.
  • This technique provides molecular-level insight where global methods fall short.
  • Has potential for advancing the rational design of structurally complex polymers.