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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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Dynamic Equilibrium02:20

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Polymer Classification: Architecture01:14

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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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Molecular Entanglement and Electrospinnability of Biopolymers
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Entangled polymer dynamics beyond reptation.

Maram Abadi1, Maged F Serag1, Satoshi Habuchi2

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Area of Science:

  • Polymer Physics
  • Biophysics
  • Materials Science

Background:

  • Macroscopic polymer properties depend on microscopic chain entanglement.
  • Current theories simplify polymer dynamics by averaging over time and space.
  • Existing methods offer an oversimplified view of spatiotemporally heterogeneous polymer dynamics.

Purpose of the Study:

  • To develop a novel method for characterizing entangled polymer dynamics.
  • To capture polymer chain motion and relaxation in real space across diverse length and time scales.
  • To provide a more accurate picture of polymer dynamics beyond current theoretical limitations.

Main Methods:

  • Development of a new single-molecule characterization platform.
  • Integration of super-resolution fluorescence imaging.
  • Application of a single-molecule tracking method, cumulative-area tracking.

Main Results:

  • Quantification of chain motion across nanometer to micrometer length scales.
  • Measurement of relaxation dynamics from milliseconds to minutes.
  • Observation of chain-position-dependent motion in entangled linear dsDNA molecules.

Conclusions:

  • The developed platform enables unprecedented characterization of polymer dynamics.
  • Revealed dynamics challenge existing theoretical frameworks for entangled polymers.
  • New insights into heterogeneous polymer motion at the single-molecule level.