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Morphological-evolution pathway during phase separation in polymer solutions with highly asymmetrical miscibility

Gang Zhang1, Tao Yang1, Sen Yang1

  • 1Frontier Institute of Science and Technology, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

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|January 20, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals unique microstructural changes in asymmetric polymer solutions during phase separation. Initial composition and aging time critically influence these pathways, guiding future material design.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Understanding phase separation in polymer solutions is crucial for material properties.
  • Highly asymmetric miscibility gaps present unique challenges in predicting microstructural evolution.
  • Existing models often simplify miscibility gap symmetry, limiting applicability to complex systems.

Purpose of the Study:

  • To analyze microstructural evolution during thermally induced phase separation in polymer solutions with highly asymmetric miscibility gaps.
  • To identify and characterize novel morphological-evolution pathways (MEPs).
  • To establish a predictive map for MEPs based on initial composition and aging time.

Main Methods:

  • Utilized Flory-Huggins thermodynamics for theoretical framework.
  • Employed nonlinear Cahn-Hilliard kinetics for simulation.
  • Conducted extensive computer simulations to observe microstructural changes.

Main Results:

  • Identified unique MEPs, including cluster-to-percolation and percolation-to-cluster transitions, distinct from symmetric systems.
  • Demonstrated that asynchronous evolution of product phases drives these MEPs.
  • Confirmed the critical role of initial solution composition in determining MEPs.

Conclusions:

  • The microstructural evolution in asymmetric polymer solutions is complex and pathway-dependent.
  • A map correlating initial composition, aging time, and MEPs was established.
  • This research provides a framework for designing microstructures in asymmetric polymer solutions.