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This study uses coarse-grained molecular dynamics simulations to model crystal network formation in high-density polyethylene. The findings reveal ordered microstructures with robust mechanical properties, crucial for plastic material applications.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Physics

Background:

  • Semi-crystalline polymers, like high-density polyethylene (HDPE), possess complex microstructures with crystalline and amorphous regions.
  • Understanding these microstructures is vital for predicting and optimizing material properties for industrial applications.
  • Current characterization methods require advanced simulation techniques to accurately model polymer behavior.

Purpose of the Study:

  • To investigate crystal network formation in HDPE using coarse-grained molecular dynamics (CGMD) simulations.
  • To analyze the resulting microstructure, including lamellar crystal stems and amorphous regions.
  • To determine the mechanical properties, such as tensile strength, of the simulated semi-crystalline model.

Main Methods:

  • Utilized modified Paul-Yoon-Smith (PYS/R) forcefield parameters for CGMD simulations of HDPE melt.
  • Performed isothermal crystallization at 300 K and 1 atm to observe crystal growth and orientation.
  • Analyzed one-dimensional density distributions to confirm lamellar-stack ordering and calculated densities for crystalline (ρcr) and amorphous (ρam) regions.

Main Results:

  • Simulations predicted multi-nucleus crystal growth with alternating lamellar crystal stems and amorphous regions.
  • Obtained semi-crystalline model density (ρcr ≈ 0.913 g·cm⁻³) and amorphous model density (ρam ≈ 0.856 g·cm⁻³), with a ratio (ρcr/ρam ≈ 1.06) consistent with experimental data.
  • Achieved a degree of crystallinity (χc) of approximately 52% at 300 K, with observed increases indicating lamellar stem alignment.
  • Stress-strain curves mimicked tensile tests, showing significant tensile strength at yield (≈100 MPa) and break (350%), with cavitation linked to lamellar stem alignment.

Conclusions:

  • The PYS/R forcefield effectively models crystal network formation in HDPE, producing a reliable semi-crystalline microstructure.
  • The simulated microstructure exhibits ordered crystalline and amorphous segments with robust mechanical properties.
  • This simulation approach aids in predicting microstructure-mechanical property relationships in plastics under stress, valuable for material design and application.