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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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.
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight. So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
Determination of Molar Masses of Polymers II01:27

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Reduced-order molecular-dynamics model for polystyrene by equivalent-structure coarse graining.

Anand Srivastava1, Somnath Ghosh

  • 1Department of Mechanical Engineering, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a reduced-order model for polystyrene using molecular dynamics. This coarse-grained approach simplifies polymer simulations, enabling larger-scale modeling.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Polymer Physics

Background:

  • Developing accurate coarse-grained models for polymers is crucial for large-scale simulations.
  • Existing models often struggle to balance accuracy with computational efficiency for complex polymers like polystyrene.

Purpose of the Study:

  • To develop a reduced-order, equivalent-structure based model for polystyrene within a rigid body molecular dynamics framework.
  • To enable significant scaling up of modeling system size by suppressing high-frequency motions.

Main Methods:

  • Replaced detailed polystyrene monomers (basic structural elements, BSEs) with simplified spherical backbone and ellipsoidal sidegroup particles.
  • Employed mass, centroid, angular momentum, and energy equivalence for homogenization.
  • Utilized an anisotropic RE-squared (RE2) interaction potential for nonbonded interactions to capture stereochemistry.
  • Calibrated nonbonded parameters using experimental density and radial distribution functions.

Main Results:

  • Successfully developed a reduced-order model for polystyrene.
  • Demonstrated significant scaling up of modeling system size.
  • Validated the model's accuracy by comparing with fine-scale simulations.

Conclusions:

  • The proposed equivalent-structure model provides an efficient yet accurate representation of polystyrene for molecular dynamics simulations.
  • This approach facilitates the study of larger and more complex polymer systems.