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Related Concept Videos

Polymers02:34

Polymers

35.8K
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...
35.8K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
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...
2.8K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
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...
2.9K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.5K
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.
3.5K
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.9K
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...
2.9K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.6K

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Forensics of polymer networks.

Andrey V Dobrynin1, Yuan Tian2, Michael Jacobs2

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. avd@email.unc.edu.

Nature Materials
|September 25, 2023
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Summary
This summary is machine-generated.

Researchers developed a new method to decode polymer network structures from their mechanical properties. This breakthrough allows for precise quality control and classification of soft materials, paving the way for AI-driven material design.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Polymer networks are essential in numerous applications, from synthetic rubber to biological tissues.
  • Their mechanical properties (elasticity, strain-stiffening, stretchability) are dictated by composition, strand conformation, and topology.
  • The internal structure of polymer networks has remained largely uncharacterized due to a lack of decoding methods.

Purpose of the Study:

  • To develop a method for decoding the internal structure of polymer networks from their mechanical properties.
  • To quantify key structural parameters like crosslink density and strand flexibility.
  • To enable quality control and classification of polymer networks based on their stress-distribution effectiveness.

Main Methods:

  • Analysis of nonlinear responses of polymer networks to deformation.
  • Quantification of crosslink density, strand flexibility, and the fraction of stress-supporting strands.
  • Development of a 'forensic' approach to infer structure from macroscopic properties.

Main Results:

  • Successfully decoded structural information (crosslink density, strand flexibility, stress-supporting strands) from network properties.
  • Demonstrated the ability to perform quality control and compare actual vs. targeted network architectures.
  • Established a method for classifying networks based on stress distribution efficiency.

Conclusions:

  • The developed method provides a crucial link between polymer network structure and macroscopic properties.
  • This approach facilitates quality control, architectural comparison, and network classification.
  • It represents a significant step towards implementing artificial intelligence in soft matter design.