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Related Concept Videos

Polymers02:34

Polymers

40.6K
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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Polymers02:34

Polymers

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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Definite Integral01:29

Definite Integral

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Consider a real-valued function defined on a closed interval. One of the fundamental objectives in calculus is to determine the area under the graph of such a function. When an exact computation is not readily available, this area can be estimated by dividing the interval into a finite number of equal subintervals. Each subinterval corresponds to a rectangle whose width is the length of the subinterval and whose height is determined by the value of the function at a selected point within that...
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Chronic Implantation of Multiple Flexible Polymer Electrode Arrays
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Low-cost high integration IR polymer microlens array.

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    Summary
    This summary is machine-generated.

    Researchers developed a low-cost infrared polymer microlens array using nanoimprinting. This device offers high optical quality for advanced infrared imaging and laser fabrication applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Microlens arrays are crucial for optical systems.
    • Developing cost-effective and high-performance microlens arrays for infrared applications remains a challenge.

    Purpose of the Study:

    • To fabricate a low-cost refractive convex microlens array device using infrared polymer.
    • To characterize the optical performance and suitability for infrared applications.

    Main Methods:

    • Nanoimprinting technique was employed for fabrication.
    • The device was characterized for surface quality, spectral transmittance, imaging resolution, and surface damage threshold.
    • Infrared imaging and parallel laser inscription experiments were conducted.

    Main Results:

    • A microlens array device with over 4000 microlenslets in a 10mm x 10mm footprint was successfully fabricated.
    • The device demonstrated high optical quality, low fluence loss, and excellent imaging resolution.
    • Characterization confirmed remarkable optical performance for IR applications.

    Conclusions:

    • The fabricated low-cost infrared polymer microlens array exhibits high optical quality and performance.
    • The device is a promising candidate for cutting-edge infrared applications, including IR imaging and laser fabrication.
    • Nanoimprinting offers a viable method for producing such advanced optical components.