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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.
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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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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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State Transitions and Crystalline Structures of Single Polyethylene Rings: MD Simulations.

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Cyclic polyethylene (PE) chains exhibit distinct chain-folding transitions and a pronounced odd-even effect during cooling, differing from linear PE. This topological constraint impacts crystallization, leading to more compact structures.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding polymer crystallization is crucial for material properties.
  • Cyclic polymers present unique topological constraints compared to linear ones.
  • The influence of topology on polymer chain folding and crystallization is not fully understood.

Purpose of the Study:

  • To investigate structural changes in cyclic polyethylene (PE) chains during cooling.
  • To compare the crystallization behavior of cyclic PE with its linear counterpart.
  • To elucidate the impact of topological constraints on polymer chain folding and the odd-even effect.

Main Methods:

  • Molecular dynamics simulations were employed to study single cyclic PE chains.
  • A pseudo phase diagram was constructed based on chain length and temperature.
  • Structural analyses included shape anisotropy, folding models, and re-entry modes.

Main Results:

  • A consistent chain-folding transition was observed in PE rings during cooling.
  • Cyclic PE chains showed a more pronounced odd-even effect in crystallization compared to linear chains.
  • Cyclic chains adopted shorter crystalline stem lengths and more compact folded structures.

Conclusions:

  • Topological constraints significantly impact polymer crystallization and the odd-even effect.
  • A honeycomb model can explain the odd-even effect in both linear and cyclic chains.
  • Findings provide insights into polymer crystallization with varying topologies and potential for surface tension prediction.