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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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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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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Effect of hydrodynamic interaction on polymeric tethers.

Suman G Das1, Dimitri Pescia, Mithun Biswas

  • 1Physics Department, Indian Institute of Technology-Bombay, Powai 400076, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary

Polymer dynamics and fluid interactions significantly influence weak bond breakage in biological structures. Hydrodynamic interactions accelerate bond rupture and enhance polymer motion coherence.

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Area of Science:

  • Biophysics
  • Polymer Physics

Background:

  • Weak bonds are crucial in biological systems, acting as internal structural links (e.g., protein folding, DNA/RNA loops) or external connectors (e.g., membrane proteins).
  • Traditional bond breakage models focus on binding potential and medium viscosity, often overlooking the influence of coupled extended structures.

Purpose of the Study:

  • To investigate how the dynamics of a stretched polymer influence the breakage of a tethered soft bond.
  • To determine the role of hydrodynamic interactions in modifying bond breakage rates and polymer dynamics.

Main Methods:

  • Development of a generic model simulating a stretched polymer attached to a soft bond.
  • Analysis of the polymer's dynamics, including thermal noise and hydrodynamic coupling, on bond rupture.
  • Examination of the collective mode motion of the polymer.

Main Results:

  • Polymer dynamics, beyond thermal noise, are critical factors in bond breakage.
  • Hydrodynamic interactions significantly enhance the rate of bond breakage.
  • Hydrodynamic interactions lead to more coherent motion of the polymer's unstable collective mode.

Conclusions:

  • The interplay between polymer dynamics, hydrodynamic interactions, and thermal fluctuations governs weak bond stability in biological contexts.
  • Understanding these coupled dynamics is essential for predicting the behavior of biological structures involving weak bonds.