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Accelerated Thermal Depolymerization of Cyclic Polyphthalaldehyde with a Polymeric Thermoacid Generator.

Hector Lopez Hernandez1, Olivia P Lee2, Catherine M Possanza Casey2

  • 1Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.

Macromolecular Rapid Communications
|May 1, 2018
PubMed
Summary
This summary is machine-generated.

New polymer films degrade at 85°C using a blend of cyclic polyphthalaldehyde (cPPA) and poly(vinyl tert-butyl carbonate sulfone) (PVtBCS). This blend offers tunable degradation for transient electronics.

Keywords:
ceiling temperaturemetastable polymerspolyphthalaldehydetransient electronicstriggered depolymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Developing transient materials is crucial for sustainable electronics and reducing e-waste.
  • Controlled degradation of polymers at specific temperatures is a key challenge in materials science.

Purpose of the Study:

  • To create thermally triggerable polymer films from a blend of cyclic polyphthalaldehyde (cPPA) and poly(vinyl tert-butyl carbonate sulfone) (PVtBCS).
  • To investigate the acid-catalyzed depolymerization mechanism and its impact on degradation kinetics.
  • To evaluate the potential of these blends for applications in transient electronic packaging.

Main Methods:

  • Blend preparation of cPPA and PVtBCS.
  • Thermogravimetric analysis (TGA) to determine degradation temperatures and kinetics.
  • Raman spectroscopy to identify depolymerization products.

Main Results:

  • The PVtBCS/cPPA blend degrades at modest temperatures (≈85 °C).
  • The addition of 2 wt% PVtBCS lowered the mass loss onset temperature by 22 °C compared to neat cPPA.
  • Higher PVtBCS concentrations accelerated the depolymerization rate of cPPA.
  • Raman spectroscopy confirmed o-phthalaldehyde as the primary depolymerization product.

Conclusions:

  • The PVtBCS/cPPA blend exhibits tunable thermal degradation triggered by acid generation.
  • This material is a promising candidate for transient electronic packaging and other temporary polymer applications.