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Related Concept Videos

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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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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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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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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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...
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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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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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Macroscopic analogue to entangled polymers.

Leopoldo R Gómez1,2, Nicolás A García2,3, Thorsten Pöschel1

  • 1Institut für Multiscale Simulation, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052, Erlangen, Germany. lgomez@uns.edu.ar.

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Summary
This summary is machine-generated.

Macroscopic analogies like spaghetti accurately model polymer entanglement physics. Experiments show rubber band entanglements increase with length, mirroring polymer behavior and validating these physical models.

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Area of Science:

  • Polymer Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Polymeric material structures are often analogized to macroscopic, athermal systems like spaghetti or earthworms.
  • The topological similarity between these analogies and actual polymer chains remains uncertain.
  • Understanding polymer entanglement is crucial for predicting material properties.

Purpose of the Study:

  • To experimentally investigate the validity of macroscopic analogies for polymer entanglement.
  • To compare the entanglement statistics of linear rubber bands with those of linear polymers.
  • To provide empirical evidence for the use of athermal analogues in polymer physics.

Main Methods:

  • Utilized X-ray tomography to visualize and analyze the 3D structure of entangled linear rubber bands in arrays.
  • Quantified the number of entanglements within the rubber band system.
  • Measured the distribution of entanglements and chain ends relative to container surfaces.

Main Results:

  • The average number of entanglements per ribbon showed a linear increase with ribbon length, consistent with linear polymer behavior.
  • Entanglements were found to be less frequent near the container surface.
  • An increased frequency of chain ends was observed near the container surface, mirroring findings in trapped polymers.

Conclusions:

  • Provides the first experimental validation for using macroscopic, athermal analogues to model polymer structures.
  • Confirms the intuitive insights of early polymer physics pioneers regarding topological similarities.
  • Supports the use of macroscopic analogues as a valuable tool for understanding polymer entanglement and physics.