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Development of a Cure Model for Unsaturated Polyester Resin Systems Based on Processing Conditions.

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  • 1Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA.

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Summary

Differential Scanning Calorimetry (DSC) reveals how unsaturated polyester resin (UPR) cures. Higher temperatures initially increase cure rate but reduce the maximum degree of cure, impacting composite material processing.

Keywords:
DSCautocatalytic modelcure behaviorcure kineticscure simulationunsaturated polyester resin

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Unsaturated polyester resins (UPRs) are vital in transportation, marine, and infrastructure composites.
  • Optimizing UPR formulations requires understanding their processing behavior.
  • Differential Scanning Calorimetry (DSC) is a key technique for evaluating resin cure kinetics.

Purpose of the Study:

  • To investigate the non-isothermal and isothermal curing behavior of UPRs.
  • To simulate UPR curing under various processing conditions using DSC data.
  • To determine the effect of temperature on cure rate and degree of cure.

Main Methods:

  • Non-isothermal DSC tests conducted from 0 °C to 250 °C at varying heating/cooling rates.
  • Isothermal DSC tests performed from 0 °C to 170 °C.
  • Autocatalytic model utilized to simulate curing kinetics and predict degree of cure.

Main Results:

  • Cure rate decreased as temperature increased from 10 °C to 170 °C, while heat of reaction increased.
  • Maximum simulated degree of cure (α) reached 71.25% at 85 °C.
  • At 5 °C, the maximum degree of cure (α) was below 12% due to insufficient thermal energy for crosslinking.

Conclusions:

  • DSC provides critical data for optimizing UPR processing and formulation.
  • Temperature significantly influences UPR cure kinetics, affecting the final material properties.
  • Simulations based on DSC data enable prediction of cure behavior under different manufacturing scenarios.