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Polymers02:34

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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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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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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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Multi-scale ordering in highly stretchable polymer semiconducting films.

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Researchers developed a new solution processing method to align conjugated polymers in stretchable semiconductors. This significantly enhances charge carrier mobility for advanced wearable electronics, even under high strain.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Electronics Engineering

Background:

  • Stretchable semiconducting polymers are crucial for skin-like wearable electronics.
  • Improving electrical performance is essential for advanced functionalities in these devices.

Purpose of the Study:

  • To develop a solution processing approach for multi-scale ordering and alignment of conjugated polymers.
  • To substantially improve charge carrier mobility in stretchable semiconductors.

Main Methods:

  • Solution shearing using a patterned microtrench coating blade for macroscale alignment.
  • Utilizing nanoscale spatial confinement to align polymer chain conformation and promote π-π ordering.

Main Results:

  • Achieved macroscale alignment of conjugated-polymer nanostructures along the charge transport direction.
  • Substantially reduced the energetic barrier for charge carrier transport.
  • Enhanced charge carrier mobilities in stretchable conjugated-polymer films up to threefold.
  • Maintained enhanced mobilities under strains up to 100%.

Conclusions:

  • The developed method significantly improves charge carrier mobility in stretchable semiconductors.
  • This approach enables the creation of high-performance stretchable electronic materials.
  • The technique is scalable for large-area manufacturing, demonstrated by roll-to-roll coating.