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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Cyclic Poly(phthalaldehyde): Thermoforming a Bulk Transient Material.

Elizabeth C Feinberg1,2, Hector Lopez Hernandez1,3, Christopher L Plantz1,4

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Stabilizing cyclic poly(phthalaldehyde) (cPPA) allows for thermal processing, enabling the creation of bulk plastic parts. These parts retain their on-demand depolymerization, useful for transient applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Cyclic poly(phthalaldehyde) (cPPA) is a stimuli-responsive polymer known for solid-state depolymerization, limiting its use in fabricating plastic parts due to early thermal degradation.
  • Transient applications have utilized cPPA as a packaging and encapsulating material, but its thermal instability poses challenges for manufacturing.

Purpose of the Study:

  • To investigate and tailor the thermal depolymerization of cPPA.
  • To enable thermal processing and molding of cPPA at moderate temperatures below its inherent depolymerization point.

Main Methods:

  • Stabilization of cPPA by removing the Lewis acid catalyst BF3, adding radical inhibitors, and incorporating a Lewis base.
  • Addition of a plasticizer to the stabilized cPPA.
  • Fabrication of a monolithic solid polymer using hot press molding.

Main Results:

  • cPPA was successfully stabilized against early thermal depolymerization.
  • Hot press molding of stabilized cPPA with a plasticizer yielded a monolithic solid polymer.
  • The thermally processed cPPA maintained its stimuli-responsive depolymerization capability.

Conclusions:

  • Thermal processing of cPPA is achievable at moderate temperatures by addressing its inherent instability.
  • This stabilization method allows for the fabrication of bulk plastic parts from cPPA.
  • The developed technique preserves the on-demand depolymerization feature, opening avenues for advanced transient material applications.