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Related Concept Videos

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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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Polymer Classification: Crystallinity01:21

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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.
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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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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.
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A molecularly impermeable polymer from two-dimensional polyaramids.

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Researchers developed solution-synthesized two-dimensional (2D) polyaramid nanofilms with ultra-low gas permeability. These novel 2D polymer materials offer superior barrier properties for advanced applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Conventional polymers exhibit inherent gas permeability due to chain entanglement.
  • Two-dimensional (2D) materials like graphene offer molecular impermeability but are challenging to synthesize in solution.
  • Achieving solution-processable 2D polymers with impermeability has been a significant scientific goal.

Purpose of the Study:

  • To synthesize self-supporting, spin-coatable 2D polymer nanofilms.
  • To evaluate the gas permeability properties of these novel 2D polymers.
  • To explore the potential applications of these impermeable 2D polymers.

Main Methods:

  • Solution polymerization via poly-condensation to create 2D polymers.
  • Spin-coating technique to form self-supporting nanofilms.
  • Gas permeability measurements using nitrogen and other gases (He, Ar, O2, CH4, SF6).
  • Optical interference for mechanosensitive bulge formation and stability assessment.
  • Fabrication of 2D polymer resonators and perovskite-coated films.

Main Results:

  • Demonstrated self-supporting, spin-coated 2D polyaramid nanofilms.
  • Achieved ultra-low nitrogen permeability (<3.1 × 10^-9 Barrer), nearly four orders of magnitude lower than existing polymers.
  • Exhibited similar low permeability for other tested gases.
  • Observed stable, mechanosensitive gas-filled bulges exceeding three years.
  • Fabricated 2D polymer resonators with high resonance frequencies (~8 MHz) and quality factors (up to 537).
  • Demonstrated a 14-fold reduction in perovskite lattice degradation rate with a 2D polymer coating.

Conclusions:

  • Successfully synthesized solution-processable 2D polyaramid nanofilms with unprecedented molecular impermeability.
  • These 2D polymers represent a new class of high-performance barrier materials.
  • The developed materials enable advanced applications in resonators and protective coatings for sensitive materials.
  • This breakthrough advances the development of sustainable, high-efficiency barrier technologies.