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Dynamic Compression Induced Solidification.

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Summary
This summary is machine-generated.

This study reveals how polycarbonate (PC) solidifies under pressure during flow, using rheometer and pvT measurements. Faster compression leads to lower solidification pressure, impacting injection molding simulations.

Keywords:
no-flow pressurepolycarbonatesolidification

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Area of Science:

  • Polymer Science
  • Materials Engineering
  • Rheology

Background:

  • Understanding polymer solidification is crucial for processing applications like injection molding.
  • Polycarbonate (PC) exhibits complex behavior under dynamic pressure conditions.
  • Accurate modeling of PC flow requires knowledge of its pressure-dependent solidification.

Purpose of the Study:

  • To determine the dynamic pressure-dependent solidification of polycarbonate (PC) during flow.
  • To investigate the influence of compression rate and temperature on PC solidification.
  • To assess potential measurement errors in high-pressure capillary rheometer (HPC) evaluations.

Main Methods:

  • Utilized high-pressure capillary rheometer (HPC) for dynamic flow measurements.
  • Employed isothermal pressure-volume-temperature (pvT) measurements under static conditions.
  • Analyzed solidification behavior across varying compression velocities and temperatures.

Main Results:

  • A linear relationship was observed between solidification pressure and temperature, independent of compression velocity.
  • Increased relaxation times at constant temperature and compression rates were noted.
  • Higher compression rates resulted in lower solidification pressures, indicating flow cessation.

Conclusions:

  • Polycarbonate solidification is strongly dependent on dynamic pressure and temperature.
  • HPC pressure hole evaluations can introduce errors under specific transient conditions.
  • Findings are relevant for simulating thin-walled and high-aspect-ratio microstructure filling in injection molding.