Simple and rapid electrochemical monitoring for depolymerization of polyamic acid

Jee Woo Kim, Seong Jong Kim, In Young Song, Wang Eun Lee, Kyuyoung Heo, Sang Youl Kim, Jinhee Lee, Byung Kwon Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Excellent thermal and mechanical properties of aromatic polyimides (PIs) make them attractive materials in various fields. PIs is performed using polyamic acid (PAA) precursors due to their limited solubility. However, PAAs can be easily depolymerized by moisture and heat, which can degrade the properties of PIs. Therefore, quality control of PAAs is an important task in researches and industrial applications. Here, we propose a simple, rapid, and novel method to observe the depolymerization of PAAs. The method is based on the principle that, as the molecular weight of the polymer decreases, the solution viscosity decreases, and the viscosity of the solution can be easily and rapidly measured using electrochemistry. We accelerated depolymerization by applying heat to a PAA solution and measured the change in viscosity of the solution through cyclic voltammetry. The proposed method, which also makes it possible to determine the dynamic viscosity of a polymer solution, is presented as a model system to observe state changes in various polymers.

Original languageEnglish
Article number340489
JournalAnalytica Chimica Acta
Volume1233
DOIs
StatePublished - 15 Nov 2022

Keywords

  • Diffusion
  • Electrochemical analysis
  • Polyamic acid
  • Polymer depolymerization sensing
  • Solution viscosity

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