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Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

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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...
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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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.
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...
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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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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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Polymers02:34

Polymers

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Molecular Characterization of Polymer Networks.

Scott P O Danielsen1, Haley K Beech2, Shu Wang3

  • 1Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina 27599, United States.

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Summary

Understanding polymer networks requires advanced characterization techniques. This overview helps chemists bridge molecular properties to macroscopic performance for better material design.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Polymer networks are complex systems where molecular properties are often poorly understood.
  • Translating component behavior to network performance is challenging due to undefined network structures.
  • Existing characterization techniques for polymer networks are unfamiliar to many scientists.

Purpose of the Study:

  • To provide a critical overview of characterization techniques for polymer networks.
  • To unify underlying principles and highlight challenges in network characterization.
  • To guide chemists in planning characterization strategies for molecular control.

Main Methods:

  • Characterization of individual polymer strands and junctions.
  • Analysis of the gelation process and network formation.
  • Assessment of the final network structure, dynamics, and mechanics.

Main Results:

  • Overview of techniques for understanding polymer network molecular structure.
  • Emphasis on the relationship between molecular properties and material behavior.
  • Demonstration that single methods are insufficient; combinations are required.

Conclusions:

  • Strategic combinations of multiple characterization techniques are essential for a comprehensive understanding of polymer networks.
  • Improved characterization enables molecular-level control over macroscopic material properties.
  • This work facilitates interdisciplinary approaches to polymer network design and application.