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Interfacial segregation in polymer blends driven by acid-base interactions.

Shishir Prasad1, He Zhu, Anish Kurian

  • 1Department of Polymer Science, The University of Akron , Akron, Ohio 44325, United States.

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|December 10, 2013
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Summary
This summary is machine-generated.

Poly(methyl methacrylate) (PMMA) segregates to sapphire surfaces due to acid-base interactions, influencing polymer blend behavior. This study quantifies the interfacial energy differences between PMMA/sapphire and polystyrene/sapphire interfaces.

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Area of Science:

  • Surface Science
  • Polymer Chemistry
  • Spectroscopy

Background:

  • Polymer blends exhibit complex interfacial behavior.
  • Understanding interfacial segregation is crucial for material properties.
  • Acid-base interactions play a significant role in surface phenomena.

Purpose of the Study:

  • To measure interfacial concentrations of PMMA/PS blends.
  • To investigate the role of acid-base interactions in interfacial segregation.
  • To determine interfacial energy differences at solid-polymer interfaces.

Main Methods:

  • Infrared-visible sum frequency generation (SFG) spectroscopy.
  • Analysis of sapphire surface hydroxyl (OH) peak shifts.

Main Results:

  • PMMA preferentially segregates to the sapphire substrate.
  • Acid-base interactions between PMMA carbonyl groups and sapphire hydroxyl groups drive segregation.
  • Interfacial energy difference between PMMA/sapphire and PS/sapphire is ~44-45 mJ/m(2).

Conclusions:

  • Acid-base interactions are critical for controlling interfacial segregation in polymer blends.
  • SFG spectroscopy is effective for quantifying interfacial phenomena.
  • Tailoring interfacial energy is key for designing polymer blend interfaces.