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Related Concept Videos

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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...
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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Related Experiment Video

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Low-loss polymers for terahertz applications.

Alexander Podzorov1, Guilhem Gallot

  • 1Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, and INSERM U696, Palaiseau, France.

Applied Optics
|June 21, 2008
PubMed
Summary
This summary is machine-generated.

High-precision terahertz spectroscopy reveals polymers like polystyrene, TPX, and Zeonor exhibit excellent terahertz and visible transparency. These materials are suitable for optical components in terahertz applications, offering advantages over traditional materials.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Spectroscopy

Background:

  • Terahertz (THz) spectroscopy is a powerful tool for material characterization.
  • Polymers are increasingly utilized in advanced optical and microfluidic systems.
  • There is a need for materials offering both THz and visible transparency for integrated devices.

Purpose of the Study:

  • To evaluate the terahertz and visible optical properties of various polymers.
  • To assess the suitability of polymers for THz applications requiring visual access.
  • To identify potential polymer candidates for lenses, windows, and waveguides in THz systems.

Main Methods:

  • High-precision terahertz time-domain spectroscopy (THz-TDS) was employed.
  • Measurements were conducted on cross-linked polystyrene, TPX, and Zeonor over the 0.2–4.2 THz frequency range.
  • Terahertz characteristics of polydimethylsiloxane (PDMS) were also investigated.

Main Results:

  • Cross-linked polystyrene, TPX, and Zeonor demonstrated significant terahertz and visible transparency.
  • PDMS exhibited absorption properties suitable for integration into THz experiments.
  • The thermoplastic nature of these polymers was confirmed.

Conclusions:

  • Polymers such as cross-linked polystyrene, TPX, and Zeonor are promising materials for THz optical components.
  • Their dual transparency makes them ideal for applications in biological imaging and microfluidics.
  • These polymers offer a viable alternative to silicon and Teflon for devices needing constant visual monitoring.