期刊
ANALYTICA CHIMICA ACTA
卷 1233, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.aca.2022.340489
关键词
Polymer depolymerization sensing; Polyamic acid; Electrochemical analysis; Solution viscosity; Diffusion
资金
- National Research Foundation of Korea- the Ministry of Science and ICT [NRF- 2021R1A2C4002069, NRF-2018R1C1B6008668]
- Basic Science Research Program of the National Research Foundation of Korea (NRF) - Ministry of Education [2021R1A6A1A10039823]
- Institutional Research Program of the Korea Research Institute of Chemical Technology (KRICT) [SI2252-20]
- National Research Foundation (NRF) of Korea [NRF-2021R1A4A1052070]
Aromatic polyimides (PIs) have excellent thermal and mechanical properties, making them attractive materials in various fields. However, their polyamic acid (PAA) precursors are susceptible to depolymerization due to moisture and heat, which can degrade the properties of PIs. Therefore, controlling the quality of PAAs is crucial in research and industrial applications. In this study, we propose a simple and rapid method to observe the depolymerization of PAAs.
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.
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