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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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...
Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Crystallite Rotation Drives Strain Softening in Semicrystalline Polyethylene.

Kyle Wm Hall1, Timothy W Sirk2, Wataru Shinoda3

  • 1Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States.

ACS Materials Au
|July 11, 2026
PubMed
Summary

This study reveals how crystallite orientation in semicrystalline polyethylene affects its mechanical response under triaxial strain. Local stress imbalances from crystallite rotation significantly influence deformation, potentially causing plastic deformation like banding or cavitation.

Keywords:
coarse-grainingcrystallizationmechanicssemicrystalline polymerstress relaxation

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Computational Materials Science

Background:

  • Semicrystalline polymers like polyethylene (PE) exhibit complex mechanical behaviors under stress.
  • Understanding the relationship between microstructure and macroscopic properties is crucial for material design.

Purpose of the Study:

  • To investigate the mechanical response of semicrystalline polyethylene under triaxial strain.
  • To elucidate the role of crystallite orientation distribution in material deformation.

Main Methods:

  • Coarse-grained molecular dynamics (CGMD) simulations were employed.
  • The Shinoda-DeVane-Klein (SDK) model for polyethylene was utilized.
  • Simulations involved over 2 x 10^6 particles, representing > 2 x 10^7 atoms and a volume > 10^5 nm^3.

Main Results:

  • At higher strains (0.25-0.5), stress correlated with polymer backbone orientation.
  • At intermediate strains (0.05-0.3), strain softening showed significant variability due to initial crystallite orientation distribution.
  • Compressive stresses induced crystallite rotation, decreasing tensile stress and influencing strain hardening onset.

Conclusions:

  • Initial crystallite orientation distribution strongly dictates mechanical response, especially at intermediate strains.
  • Local stress imbalances arising from crystallite rotation are critical drivers of localized strain and plastic deformation.
  • While spatial averaging smooths macroscopic behavior, microscale phenomena like crystallite rotation are key to understanding complex deformation modes such as banding and cavitation.