解聚
化学
粘度计
粘度
聚合物
电化学
循环伏安法
水溶液
特性粘度
线性扫描伏安法
化学工程
高分子化学
有机化学
电极
热力学
物理化学
工程类
物理
作者
Jee Hyun Kim,Seong Jong Kim,In Young Song,Wang-Eun Lee,Kyuyoung Heo,Sang Hoon Kim,Jinhee Lee,Byung-Gee Kim
标识
DOI:10.1016/j.aca.2022.340489
摘要
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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