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Related Concept Videos

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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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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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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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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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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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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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Network Polymer Properties Engineered Through Polymer Backbone Dispersity and Structure.

Ibrahim O Raji1, Obed J Dodo1, Nirob K Saha1

  • 1Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, USA.

Angewandte Chemie (International Ed. in English)
|March 28, 2024
PubMed
Summary
This summary is machine-generated.

Controlling polymer chain dispersity is key for advanced materials. Intermediate dispersity enhances polymer network properties like swelling, tensile strength, and adhesion.

Keywords:
Adhesive PropertiesMechanical propertiesNetwork structurePolymer DispersityPolymer Networks

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Network Polymers

Background:

  • Dispersity (Đ or Mw/Mn) critically influences polymer properties and material performance.
  • Tailoring dispersity alongside molecular weight is essential for precise material design.

Purpose of the Study:

  • To develop polymer networks with independent control over molecular weight and dispersity.
  • To investigate the impact of varying polymer dispersity on network properties.

Main Methods:

  • Utilized RAFT polymerization to synthesize polymer libraries with controlled dispersity.
  • Created polymer networks via post-polymerization crosslinking using disulfide linkers.
  • Evaluated tensile, swelling, and adhesive properties of the developed polymer networks.

Main Results:

  • Polymers with intermediate dispersity (1.3-1.5 for DP 100, 1.6-2.1 for DP 200) exhibited superior swelling ratio, tensile strength, and extensibility.
  • Adhesive properties were enhanced in networks with intermediate dispersity chains at DP 200.
  • Materials with very high or very low dispersity showed comparatively poorer performance.

Conclusions:

  • Intermediate polymer chain dispersity is optimal for enhancing mechanical and adhesive properties in polymer networks.
  • Independent control over dispersity offers a powerful tool for designing high-performance polymer materials.
  • Findings provide valuable insights for tailoring polymer architectures for specific applications.